[cig-commits] r19599 - in short/3D/PyLith/branches/pylith-scecdynrup: . libsrc/pylith libsrc/pylith/materials modulesrc/materials pylith pylith/materials unittests/libtests/materials unittests/libtests/materials/data unittests/pytests/materials

brad at geodynamics.org brad at geodynamics.org
Tue Feb 7 13:21:03 PST 2012


Author: brad
Date: 2012-02-07 13:21:03 -0800 (Tue, 07 Feb 2012)
New Revision: 19599

Added:
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.cc
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.hh
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.icc
   short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/DruckerPragerPlaneStrain.i
   short/3D/PyLith/branches/pylith-scecdynrup/pylith/materials/DruckerPragerPlaneStrain.py
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.cc
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.hh
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElastic.py
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.cc
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.hh
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDep.py
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.cc
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.hh
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/TestDruckerPragerPlaneStrain.py
Modified:
   short/3D/PyLith/branches/pylith-scecdynrup/TODO
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/Makefile.am
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPrager3D.cc
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.hh
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.icc
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/Makefile.am
   short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/materialsfwd.hh
   short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/Makefile.am
   short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/materials.i
   short/3D/PyLith/branches/pylith-scecdynrup/pylith/Makefile.am
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/Makefile.am
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/generate.sh
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/Makefile.am
   short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/testmaterials.py
Log:
Merge from tunk.

Modified: short/3D/PyLith/branches/pylith-scecdynrup/TODO
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/TODO	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/TODO	2012-02-07 21:21:03 UTC (rev 19599)
@@ -2,6 +2,12 @@
 CURRENT ISSUES/PRIORITIES (1.7.0)
 ======================================================================
 
+* Manual
+
+  - Order of tensor components for Xdmf files
+  - Drucker Prager fit to yield surface
+  - Slip-weakening healing parameter
+
 * configure
   
   + Check compatibility of PyLith options with PETSc

Modified: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/Makefile.am
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/Makefile.am	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/Makefile.am	2012-02-07 21:21:03 UTC (rev 19599)
@@ -121,6 +121,7 @@
 	materials/MaxwellPlaneStrain.cc \
 	materials/PowerLaw3D.cc \
 	materials/DruckerPrager3D.cc \
+	materials/DruckerPragerPlaneStrain.cc \
 	meshio/BinaryIO.cc \
 	meshio/GMVFile.cc \
 	meshio/GMVFileAscii.cc \

Modified: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPrager3D.cc
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPrager3D.cc	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPrager3D.cc	2012-02-07 21:21:03 UTC (rev 19599)
@@ -216,7 +216,7 @@
   const PylithScalar cohesion = dbValues[db_cohesion];
   const PylithScalar dilatationAngle = dbValues[db_dilatationAngle];
  
-  const double pi = M_PI;
+  const PylithScalar pi = M_PI;
 
   if (density <= 0.0 || vs <= 0.0 || vp <= 0.0 || cohesion < 0.0 ||
       frictionAngle < 0.0 || frictionAngle > pi/2 ||

Copied: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.cc (from rev 19598, short/3D/PyLith/trunk/libsrc/pylith/materials/DruckerPragerPlaneStrain.cc)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.cc	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.cc	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,1129 @@
+// -*- C++ -*-
+//
+// ----------------------------------------------------------------------
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ----------------------------------------------------------------------
+//
+
+#include <portinfo>
+
+#include "DruckerPragerPlaneStrain.hh" // implementation of object methods
+
+#include "Metadata.hh" // USES Metadata
+
+#include "pylith/utils/array.hh" // USES scalar_array
+#include "pylith/utils/constdefs.h" // USES MAXDOUBLE
+
+#include "spatialdata/units/Nondimensional.hh" // USES Nondimensional
+
+#include "petsc.h" // USES PetscLogFlops
+
+#include <cmath> // USES fabs()
+#include <cassert> // USES assert()
+#include <cstring> // USES memcpy()
+#include <sstream> // USES std::ostringstream
+#include <iostream> // USES std::cout
+#include <stdexcept> // USES std::runtime_error
+
+// ----------------------------------------------------------------------
+namespace pylith {
+  namespace materials {
+    namespace _DruckerPragerPlaneStrain{
+
+      /// Dimension of material.
+      const int dimension = 2;
+
+      /// Number of entries in stress/strain tensors.
+      const int tensorSize = 3;
+
+      /// Number of entries in derivative of elasticity matrix.
+      const int numElasticConsts = 9;
+
+      /// Number of physical properties.
+      const int numProperties = 6;
+
+      /// Physical properties.
+      const Metadata::ParamDescription properties[] = {
+	{ "density", 1, pylith::topology::FieldBase::SCALAR },
+	{ "mu", 1, pylith::topology::FieldBase::SCALAR },
+	{ "lambda", 1, pylith::topology::FieldBase::SCALAR },
+	{ "alpha_yield", 1, pylith::topology::FieldBase::SCALAR },
+	{ "beta", 1, pylith::topology::FieldBase::SCALAR },
+	{ "alpha_flow", 1, pylith::topology::FieldBase::SCALAR }
+      };
+
+      // Values expected in properties spatial database
+      const int numDBProperties = 6;
+      const char* dbProperties[6] = {
+	"density",
+	"vs",
+	"vp" ,
+	"friction-angle",
+	"cohesion",
+	"dilatation-angle"
+      };
+
+      /// Number of state variables.
+      const int numStateVars = 2;
+
+      /// State variables.
+      const Metadata::ParamDescription stateVars[] = {
+	{ "stress_zz_initial", 1, pylith::topology::FieldBase::SCALAR },
+	{ "plastic_strain", 4, pylith::topology::FieldBase::OTHER }
+      };
+
+      // Values expected in state variables spatial database.
+      const int numDBStateVars = 5;
+      const char* dbStateVars[5] = {
+	"stress-zz-initial",
+	"plastic-strain-xx",
+	"plastic-strain-yy",
+	"plastic-strain-zz",
+	"plastic-strain-xy"
+      };
+
+    } // _DruckerPragerPlaneStrain
+  } // materials
+} // pylith
+
+// Indices of physical properties.
+const int pylith::materials::DruckerPragerPlaneStrain::p_density = 0;
+
+const int pylith::materials::DruckerPragerPlaneStrain::p_mu = 
+  pylith::materials::DruckerPragerPlaneStrain::p_density + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::p_lambda = 
+  pylith::materials::DruckerPragerPlaneStrain::p_mu + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::p_alphaYield = 
+  pylith::materials::DruckerPragerPlaneStrain::p_lambda + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::p_beta = 
+  pylith::materials::DruckerPragerPlaneStrain::p_alphaYield + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::p_alphaFlow = 
+  pylith::materials::DruckerPragerPlaneStrain::p_beta + 1;
+
+// Indices of property database values (order must match dbProperties).
+const int pylith::materials::DruckerPragerPlaneStrain::db_density = 0;
+
+const int pylith::materials::DruckerPragerPlaneStrain::db_vs = 
+  pylith::materials::DruckerPragerPlaneStrain::db_density + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::db_vp = 
+  pylith::materials::DruckerPragerPlaneStrain::db_vs + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::db_frictionAngle = 
+  pylith::materials::DruckerPragerPlaneStrain::db_vp + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::db_cohesion = 
+  pylith::materials::DruckerPragerPlaneStrain::db_frictionAngle + 1;
+
+const int pylith::materials::DruckerPragerPlaneStrain::db_dilatationAngle = 
+  pylith::materials::DruckerPragerPlaneStrain::db_cohesion + 1;
+
+// Indices of state variables.
+const int pylith::materials::DruckerPragerPlaneStrain::s_stressZZInitial = 0;
+
+const int pylith::materials::DruckerPragerPlaneStrain::s_plasticStrain = 
+  pylith::materials::DruckerPragerPlaneStrain::s_stressZZInitial + 1;
+
+// Indices of state variable database values (order must match dbStateVars).
+const int pylith::materials::DruckerPragerPlaneStrain::db_stressZZInitial = 0;
+
+const int pylith::materials::DruckerPragerPlaneStrain::db_plasticStrain = 
+  pylith::materials::DruckerPragerPlaneStrain::db_stressZZInitial + 1;
+
+// ----------------------------------------------------------------------
+// Default constructor.
+pylith::materials::DruckerPragerPlaneStrain::DruckerPragerPlaneStrain(void) :
+  ElasticMaterial(_DruckerPragerPlaneStrain::dimension,
+		  _DruckerPragerPlaneStrain::tensorSize,
+		  _DruckerPragerPlaneStrain::numElasticConsts,
+		  Metadata(_DruckerPragerPlaneStrain::properties,
+			   _DruckerPragerPlaneStrain::numProperties,
+			   _DruckerPragerPlaneStrain::dbProperties,
+			   _DruckerPragerPlaneStrain::numDBProperties,
+			   _DruckerPragerPlaneStrain::stateVars,
+			   _DruckerPragerPlaneStrain::numStateVars,
+			   _DruckerPragerPlaneStrain::dbStateVars,
+			   _DruckerPragerPlaneStrain::numDBStateVars)),
+  _fitMohrCoulomb(MOHR_COULOMB_INSCRIBED),
+  _calcElasticConstsFn(0),
+  _calcStressFn(0),
+  _updateStateVarsFn(0)
+{ // constructor
+  useElasticBehavior(true);
+} // constructor
+
+// ----------------------------------------------------------------------
+// Destructor.
+pylith::materials::DruckerPragerPlaneStrain::~DruckerPragerPlaneStrain(void)
+{ // destructor
+} // destructor
+
+// ----------------------------------------------------------------------
+// Set fit to Mohr-Coulomb surface.
+void
+pylith::materials::DruckerPragerPlaneStrain::fitMohrCoulomb(
+						FitMohrCoulombEnum value)
+{ // fitMohrCoulomb
+  _fitMohrCoulomb = value;
+} // fitMohrCoulomb
+
+// ----------------------------------------------------------------------
+// Set whether elastic or inelastic constitutive relations are used.
+void
+pylith::materials::DruckerPragerPlaneStrain::useElasticBehavior(const bool flag)
+{ // useElasticBehavior
+  if (flag) {
+    _calcStressFn = 
+      &pylith::materials::DruckerPragerPlaneStrain::_calcStressElastic;
+    _calcElasticConstsFn = 
+      &pylith::materials::DruckerPragerPlaneStrain::_calcElasticConstsElastic;
+    _updateStateVarsFn = 
+      &pylith::materials::DruckerPragerPlaneStrain::_updateStateVarsElastic;
+
+  } else {
+    _calcStressFn = 
+      &pylith::materials::DruckerPragerPlaneStrain::_calcStressElastoplastic;
+    _calcElasticConstsFn = 
+      &pylith::materials::DruckerPragerPlaneStrain::_calcElasticConstsElastoplastic;
+    _updateStateVarsFn = 
+      &pylith::materials::DruckerPragerPlaneStrain::_updateStateVarsElastoplastic;
+  } // if/else
+} // useElasticBehavior
+
+// ----------------------------------------------------------------------
+// Compute properties from values in spatial database.
+void
+pylith::materials::DruckerPragerPlaneStrain::_dbToProperties(
+				PylithScalar* const propValues,
+				const scalar_array& dbValues)
+{ // _dbToProperties
+  assert(0 != propValues);
+  const int numDBValues = dbValues.size();
+  assert(_DruckerPragerPlaneStrain::numDBProperties == numDBValues);
+
+  const PylithScalar density = dbValues[db_density];
+  const PylithScalar vs = dbValues[db_vs];
+  const PylithScalar vp = dbValues[db_vp];
+  const PylithScalar frictionAngle = dbValues[db_frictionAngle];
+  const PylithScalar cohesion = dbValues[db_cohesion];
+  const PylithScalar dilatationAngle = dbValues[db_dilatationAngle];
+
+  const PylithScalar pi = M_PI;
+ 
+  if (density <= 0.0 || vs <= 0.0 || vp <= 0.0 || cohesion < 0.0 ||
+      frictionAngle < 0.0 || frictionAngle > pi/2 ||
+      dilatationAngle < 0.0 || dilatationAngle > pi/2 ||
+      frictionAngle < dilatationAngle) {
+    std::ostringstream msg;
+    msg << "Spatial database returned illegal value for physical "
+	<< "properties.\n"
+	<< "density: " << density << "\n"
+	<< "vp: " << vp << "\n"
+	<< "vs: " << vs << "\n"
+	<< "frictionAngle: " << frictionAngle << "\n"
+	<< "cohesion: " << cohesion << "\n"
+	<< "dilatationAngle: " << dilatationAngle << "\n";
+    throw std::runtime_error(msg.str());
+  } // if
+
+  if (fabs(frictionAngle - dilatationAngle) > 1.0e-6)
+    _isJacobianSymmetric = false;
+
+  const PylithScalar mu = density * vs*vs;
+  const PylithScalar lambda = density * vp*vp - 2.0*mu;
+
+  PylithScalar alphaYield = 0.0;
+  PylithScalar beta = 0.0;
+  PylithScalar alphaFlow = 0.0;
+  switch (_fitMohrCoulomb) { // switch
+  case MOHR_COULOMB_INSCRIBED: {
+    const PylithScalar denomFriction = sqrt(3.0) * (3.0 - sin(frictionAngle));
+    const PylithScalar denomDilatation = sqrt(3.0) *
+      (3.0 - sin(dilatationAngle));
+    alphaYield = 2.0 * sin(frictionAngle)/denomFriction;
+    beta = 6.0 * cohesion * cos(frictionAngle)/denomFriction;
+    alphaFlow = 2.0 * sin(dilatationAngle)/denomDilatation;
+    break;
+  } // MOHR_COULOMB_INSCRIBED
+  case MOHR_COULOMB_MIDDLE: {
+    alphaYield = sin(frictionAngle)/3.0;
+    beta = cohesion * cos(frictionAngle);
+    alphaFlow = sin(dilatationAngle)/3.0;
+    break;
+  } // MOHR_COULOMB_MIDDLE
+  case MOHR_COULOMB_CIRCUMSCRIBED: {
+    const PylithScalar denomFriction = sqrt(3.0) * (3.0 + sin(frictionAngle));
+    const PylithScalar denomDilatation = sqrt(3.0) *
+      (3.0 + sin(dilatationAngle));
+    alphaYield = 2.0 * sin(frictionAngle)/denomFriction;
+    beta = 6.0 * cohesion * cos(frictionAngle)/denomFriction;
+    alphaFlow = 2.0 * sin(dilatationAngle)/denomDilatation;
+    break;
+  } // MOHR_COULOMB_CIRCUMSCRIBED
+  default :
+    assert(0);
+    throw std::logic_error("Unknown Mohr-Coulomb fit.");
+    break;
+  } // switch
+
+  if (lambda <= 0.0) {
+    std::ostringstream msg;
+    msg << "Attempted to set Lame's constant lambda to nonpositive value.\n"
+	<< "density: " << density << "\n"
+	<< "vp: " << vp << "\n"
+	<< "vs: " << vs << "\n";
+    throw std::runtime_error(msg.str());
+  } // if
+  assert(mu > 0);
+
+  propValues[p_density] = density;
+  propValues[p_mu] = mu;
+  propValues[p_lambda] = lambda;
+  propValues[p_alphaYield] = alphaYield;
+  propValues[p_beta] = beta;
+  propValues[p_alphaFlow] = alphaFlow;
+
+  PetscLogFlops(28);
+} // _dbToProperties
+
+// ----------------------------------------------------------------------
+// Nondimensionalize properties.
+void
+pylith::materials::DruckerPragerPlaneStrain::_nondimProperties(PylithScalar* const values,
+					         const int nvalues) const
+{ // _nondimProperties
+  assert(_normalizer);
+  assert(values);
+  assert(nvalues == _numPropsQuadPt);
+
+  const PylithScalar densityScale = _normalizer->densityScale();
+  const PylithScalar pressureScale = _normalizer->pressureScale();
+
+  values[p_density] = 
+    _normalizer->nondimensionalize(values[p_density], densityScale);
+  values[p_mu] = 
+    _normalizer->nondimensionalize(values[p_mu], pressureScale);
+  values[p_lambda] = 
+    _normalizer->nondimensionalize(values[p_lambda], pressureScale);
+  values[p_beta] = 
+    _normalizer->nondimensionalize(values[p_beta], pressureScale);
+
+  PetscLogFlops(4);
+} // _nondimProperties
+
+// ----------------------------------------------------------------------
+// Dimensionalize properties.
+void
+pylith::materials::DruckerPragerPlaneStrain::_dimProperties(PylithScalar* const values,
+						      const int nvalues) const
+{ // _dimProperties
+  assert(_normalizer);
+  assert(values);
+  assert(nvalues == _numPropsQuadPt);
+
+  const PylithScalar densityScale = _normalizer->densityScale();
+  const PylithScalar pressureScale = _normalizer->pressureScale();
+
+  values[p_density] = 
+    _normalizer->dimensionalize(values[p_density], densityScale);
+  values[p_mu] = 
+    _normalizer->dimensionalize(values[p_mu], pressureScale);
+  values[p_lambda] = 
+    _normalizer->dimensionalize(values[p_lambda], pressureScale);
+  values[p_beta] = 
+    _normalizer->dimensionalize(values[p_beta], pressureScale);
+
+  PetscLogFlops(4);
+} // _dimProperties
+
+// ----------------------------------------------------------------------
+// Compute initial state variables from values in spatial database.
+void
+pylith::materials::DruckerPragerPlaneStrain::_dbToStateVars(
+				PylithScalar* const stateValues,
+				const scalar_array& dbValues)
+{ // _dbToStateVars
+  assert(stateValues);
+  const int numDBValues = dbValues.size();
+  assert(_DruckerPragerPlaneStrain::numDBStateVars == numDBValues);
+
+  const int totalSize = 5;
+  assert(totalSize == _numVarsQuadPt);
+  assert(totalSize == numDBValues);
+  memcpy(stateValues, &dbValues[0], totalSize*sizeof(PylithScalar));
+
+} // _dbToStateVars
+
+// ----------------------------------------------------------------------
+// Nondimensionalize state variables.
+void
+pylith::materials::DruckerPragerPlaneStrain::_nondimStateVars(
+						PylithScalar* const values,
+						const int nvalues) const
+{ // _nondimStateVars
+  assert(_normalizer);
+  assert(values);
+  assert(nvalues == _numVarsQuadPt);
+
+  const PylithScalar pressureScale = _normalizer->pressureScale();
+  _normalizer->nondimensionalize(&values[s_stressZZInitial], 1, pressureScale);
+
+  PetscLogFlops(1);
+} // _nondimStateVars
+
+// ----------------------------------------------------------------------
+// Dimensionalize state variables.
+void
+pylith::materials::DruckerPragerPlaneStrain::_dimStateVars(
+						PylithScalar* const values,
+						const int nvalues) const
+{ // _dimStateVars
+  assert(_normalizer);
+  assert(values);
+  assert(nvalues == _numVarsQuadPt);
+
+  const PylithScalar pressureScale = _normalizer->pressureScale();
+  _normalizer->dimensionalize(&values[s_stressZZInitial], 1, pressureScale);
+
+  PetscLogFlops(1);
+} // _dimStateVars
+
+// ----------------------------------------------------------------------
+// Compute density at location from properties.
+void
+pylith::materials::DruckerPragerPlaneStrain::_calcDensity(
+						PylithScalar* const density,
+						const PylithScalar* properties,
+						const int numProperties,
+						const PylithScalar* stateVars,
+						const int numStateVars)
+{ // _calcDensity
+  assert(0 != density);
+  assert(0 != properties);
+  assert(_numPropsQuadPt == numProperties);
+
+  density[0] = properties[p_density];
+} // _calcDensity
+
+// ----------------------------------------------------------------------
+// Get stable time step for implicit time integration.
+PylithScalar
+pylith::materials::DruckerPragerPlaneStrain::_stableTimeStepImplicit(
+				  const PylithScalar* properties,
+				  const int numProperties,
+				  const PylithScalar* stateVars,
+				  const int numStateVars) const
+{ // _stableTimeStepImplicit
+  assert(0 != properties);
+  assert(_numPropsQuadPt == numProperties);
+  assert(0 != stateVars);
+  assert(_numVarsQuadPt == numStateVars);
+  // It's unclear what to do for an elasto-plastic material, which has no
+  // inherent time scale. For now, just set dtStable to a large value.
+  const PylithScalar dtStable = pylith::PYLITH_MAXDOUBLE;
+
+  return dtStable;
+} // _stableTimeStepImplicit
+
+// ----------------------------------------------------------------------
+// Compute stress tensor at location from properties as an elastic
+// material.
+void
+pylith::materials::DruckerPragerPlaneStrain::_calcStressElastic(
+				         PylithScalar* const stress,
+					 const int stressSize,
+					 const PylithScalar* properties,
+					 const int numProperties,
+					 const PylithScalar* stateVars,
+					 const int numStateVars,
+					 const PylithScalar* totalStrain,
+					 const int strainSize,
+					 const PylithScalar* initialStress,
+					 const int initialStressSize,
+					 const PylithScalar* initialStrain,
+					 const int initialStrainSize,
+					 const bool computeStateVars)
+{ // _calcStressElastic
+  assert(stress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == stressSize);
+  assert(properties);
+  assert(_numPropsQuadPt == numProperties);
+  assert(stateVars);
+  assert(_numVarsQuadPt == numStateVars);
+  assert(totalStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == strainSize);
+  assert(initialStress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStressSize);
+  assert(initialStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStrainSize);
+
+  const PylithScalar mu = properties[p_mu];
+  const PylithScalar lambda = properties[p_lambda];
+  const PylithScalar mu2 = 2.0 * mu;
+
+  const PylithScalar e11 = totalStrain[0] - initialStrain[0];
+  const PylithScalar e22 = totalStrain[1] - initialStrain[1];
+  const PylithScalar e12 = totalStrain[2] - initialStrain[2];
+
+  const PylithScalar s12 = lambda * (e11 + e22);
+
+  stress[0] = s12 + mu2 * e11 + initialStress[0];
+  stress[1] = s12 + mu2 * e22 + initialStress[1];
+  stress[2] = mu2 * e12 + initialStress[2];
+
+  PetscLogFlops(14);
+} // _calcStressElastic
+
+// ----------------------------------------------------------------------
+// Compute stress tensor at location from properties as an elastoplastic
+// material.
+void
+pylith::materials::DruckerPragerPlaneStrain::_calcStressElastoplastic(
+					PylithScalar* const stress,
+					const int stressSize,
+					const PylithScalar* properties,
+					const int numProperties,
+					const PylithScalar* stateVars,
+					const int numStateVars,
+					const PylithScalar* totalStrain,
+					const int strainSize,
+					const PylithScalar* initialStress,
+					const int initialStressSize,
+					const PylithScalar* initialStrain,
+					const int initialStrainSize,
+					const bool computeStateVars)
+{ // _calcStressElastoplastic
+  assert(stress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == stressSize);
+  assert(properties);
+  assert(_numPropsQuadPt == numProperties);
+  assert(stateVars);
+  assert(_numVarsQuadPt == numStateVars);
+  assert(totalStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == strainSize);
+  assert(initialStress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStressSize);
+  assert(initialStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStrainSize);
+
+  const int tensorSize = 3;
+  const int tensorSizePS = 4;
+  assert(_tensorSize == tensorSize);
+  const PylithScalar mu = properties[p_mu];
+  const PylithScalar lambda = properties[p_lambda];
+    
+  // We need to compute the plastic strain increment if state variables are
+  // from previous time step.
+  if (computeStateVars) {
+
+    const PylithScalar alphaYield = properties[p_alphaYield];
+    const PylithScalar beta = properties[p_beta];
+    const PylithScalar alphaFlow = properties[p_alphaFlow];
+    const PylithScalar mu2 = 2.0 * mu;
+    const PylithScalar bulkModulus = lambda + mu2/3.0;
+    const PylithScalar ae = 1.0/mu2;
+    const PylithScalar am = 1.0/(3.0 * bulkModulus);
+
+    const PylithScalar stressZZInitial = stateVars[s_stressZZInitial];
+
+    const PylithScalar plasticStrainT[tensorSizePS] = {
+      stateVars[s_plasticStrain],
+      stateVars[s_plasticStrain + 1],
+      stateVars[s_plasticStrain + 2],
+      stateVars[s_plasticStrain + 3]};
+    const PylithScalar meanPlasticStrainT = (plasticStrainT[0] +
+					     plasticStrainT[1] +
+					     plasticStrainT[2])/3.0;
+    PylithScalar devPlasticStrainT[tensorSizePS];
+    calcDeviatoric2DPS(devPlasticStrainT, plasticStrainT, meanPlasticStrainT);
+
+    const PylithScalar diag[tensorSizePS] = { 1.0, 1.0, 1.0, 0.0 };
+
+    // Initial stress values
+    const PylithScalar meanStressInitial = (initialStress[0] +
+					    initialStress[1] +
+					    stressZZInitial)/3.0;
+    const PylithScalar devStressInitial[tensorSizePS] = {
+      initialStress[0] - meanStressInitial,
+      initialStress[1] - meanStressInitial,
+      stressZZInitial - meanStressInitial,
+      initialStress[2]};
+
+    // Initial strain values
+    const PylithScalar meanStrainInitial = (initialStrain[0] +
+					    initialStrain[1])/3.0;
+    const PylithScalar devStrainInitial[tensorSizePS] = {
+      initialStrain[0] - meanStrainInitial,
+      initialStrain[1] - meanStrainInitial,
+      -meanStrainInitial,
+      initialStrain[2]};
+
+    // Values for current time step
+    const PylithScalar meanStrainTpdt = (totalStrain[0] + totalStrain[1])/3.0;
+    const PylithScalar meanStrainPPTpdt = meanStrainTpdt - meanPlasticStrainT -
+      meanStrainInitial;
+
+    const PylithScalar strainPPTpdt[tensorSizePS] =
+      { totalStrain[0] - meanStrainTpdt - devPlasticStrainT[0] -
+	devStrainInitial[0],
+	totalStrain[1] - meanStrainTpdt - devPlasticStrainT[1] -
+	devStrainInitial[1],
+	- meanStrainTpdt - devPlasticStrainT[2] - devStrainInitial[2],
+	totalStrain[2] - devPlasticStrainT[3] - devStrainInitial[3] };
+
+    // Compute trial elastic stresses and yield function to see if yield should
+    // occur.
+    const PylithScalar trialDevStress[tensorSizePS] = {
+      strainPPTpdt[0]/ae + devStressInitial[0],
+      strainPPTpdt[1]/ae + devStressInitial[1],
+      strainPPTpdt[2]/ae + devStressInitial[2],
+      strainPPTpdt[3]/ae + devStressInitial[3]
+    };
+    const PylithScalar trialMeanStress = meanStrainPPTpdt/am +
+      meanStressInitial;
+    const PylithScalar stressInvar2 =
+      sqrt(0.5 * scalarProduct2DPS(trialDevStress, trialDevStress));
+    const PylithScalar yieldFunction = 3.0 * alphaYield * trialMeanStress +
+      stressInvar2 - beta;
+#if 0 // DEBUGGING
+    std::cout << "Function _calcStressElastoPlastic: elastic" << std::endl;
+    std::cout << "  alphaYield:       " << alphaYield << std::endl;
+    std::cout << "  beta:             " << beta << std::endl;
+    std::cout << "  trialMeanStress:  " << trialMeanStress << std::endl;
+    std::cout << "  stressInvar2:     " << stressInvar2 << std::endl;
+    std::cout << "  yieldFunction:    " << yieldFunction << std::endl;
+#endif
+    PetscLogFlops(62);
+
+    // If yield function is greater than zero, compute elastoplastic stress.
+    if (yieldFunction >= 0.0) {
+      const PylithScalar devStressInitialProd =
+	scalarProduct2DPS(devStressInitial, devStressInitial);
+      const PylithScalar strainPPTpdtProd =
+	scalarProduct2DPS(strainPPTpdt, strainPPTpdt);
+      const PylithScalar d =
+	sqrt(ae * ae * devStressInitialProd + 2.0 * ae *
+	     scalarProduct2DPS(devStressInitial, strainPPTpdt) +
+	     strainPPTpdtProd);
+      const PylithScalar plasticMult = 2.0 * ae * am *
+	(3.0 * alphaYield * meanStrainPPTpdt/am + d/(sqrt(2.0) * ae) - beta)/
+	(6.0 * alphaYield * alphaFlow * ae + am);
+      const PylithScalar meanStressTpdt =
+	(meanStrainPPTpdt - plasticMult * alphaFlow)/am + meanStressInitial;
+      PylithScalar deltaDevPlasticStrain = 0.0;
+      PylithScalar devStressTpdt = 0.0;
+      PylithScalar totalStress[tensorSizePS];
+      for (int iComp=0; iComp < tensorSizePS; ++iComp) {
+	deltaDevPlasticStrain = plasticMult *(strainPPTpdt[iComp] +
+					      ae * devStressInitial[iComp])/
+	  (sqrt(2.0) * d);
+	devStressTpdt = (strainPPTpdt[iComp] - deltaDevPlasticStrain)/ae +
+	  devStressInitial[iComp];
+	totalStress[iComp] = devStressTpdt + diag[iComp] * meanStressTpdt;
+      } // for
+      stress[0] = totalStress[0];
+      stress[1] = totalStress[1];
+      stress[2] = totalStress[3];
+
+    PetscLogFlops(51 + 11 * tensorSizePS);
+
+    } else {
+      // No plastic strain.
+      const PylithScalar meanStressTpdt = meanStrainPPTpdt/am +
+	meanStressInitial;
+      stress[0] = strainPPTpdt[0]/ae + devStressInitial[0] + meanStressTpdt; 
+      stress[1] = strainPPTpdt[1]/ae + devStressInitial[1] + meanStressTpdt; 
+      stress[2] = strainPPTpdt[3]/ae + devStressInitial[3]; 
+
+      PetscLogFlops(10);
+    } // if
+
+    // If state variables have already been updated, the plastic strain for the
+    // time step has already been computed.
+  } else {
+    const PylithScalar mu2 = 2.0 * mu;
+    const PylithScalar plasticStrainTpdt[tensorSize] = {
+      stateVars[s_plasticStrain],
+      stateVars[s_plasticStrain + 1],
+      stateVars[s_plasticStrain + 3]
+    };
+
+    const PylithScalar e11 = totalStrain[0] - plasticStrainTpdt[0] -
+      initialStrain[0];
+    const PylithScalar e22 = totalStrain[1] - plasticStrainTpdt[1] -
+      initialStrain[1];
+    const PylithScalar e12 = totalStrain[2] - plasticStrainTpdt[2] -
+      initialStrain[2];
+
+    const PylithScalar traceStrainTpdt = e11 + e22;
+    const PylithScalar s12 = lambda * traceStrainTpdt;
+
+    stress[0] = s12 + mu2 * e11 + initialStress[0];
+    stress[1] = s12 + mu2 * e22 + initialStress[1];
+    stress[2] = mu2 * e12 + initialStress[2];
+
+    PetscLogFlops(17);
+
+  } // else
+#if 0 // DEBUGGING
+  //**  This debugging code won't work for plane strain since we're missing
+  // stressZZ. Not sure if this can be fixed.
+  const PylithScalar alphaYield = properties[p_alphaYield];
+  const PylithScalar beta = properties[p_beta];
+  const PylithScalar alphaFlow = properties[p_alphaFlow];
+  const PylithScalar meanStressTest = (stress[0] + stress[1])/3.0;
+  const PylithScalar devStressTest[] = { stress[0] - meanStressTest,
+				   stress[1] - meanStressTest,
+				   stress[2] - meanStressTest,
+				   stress[3],
+				   stress[4],
+				   stress[5]};
+  const PylithScalar stressInvar2Test =
+    sqrt(0.5 *
+	 pylith::materials::ElasticMaterial::scalarProduct3D(devStressTest,
+							     devStressTest));
+  
+  const PylithScalar yieldFunctionTest = 3.0 * alphaYield * meanStressTest +
+      stressInvar2Test - beta;
+  std::cout << "Function _calcStressElastoPlastic: end" << std::endl;
+  std::cout << "  alphaYield:        " << alphaYield << std::endl;
+  std::cout << "  beta:              " << beta << std::endl;
+  std::cout << "  meanStressTest:    " << meanStressTest << std::endl;
+  std::cout << "  stressInvar2Test:  " << stressInvar2Test << std::endl;
+  std::cout << "  yieldFunctionTest: " << yieldFunctionTest << std::endl;
+#endif
+
+} // _calcStressElastoplastic
+
+// ----------------------------------------------------------------------
+// Compute derivative of elasticity matrix at location from properties.
+void
+pylith::materials::DruckerPragerPlaneStrain::_calcElasticConstsElastic(
+				         PylithScalar* const elasticConsts,
+					 const int numElasticConsts,
+					 const PylithScalar* properties,
+					 const int numProperties,
+					 const PylithScalar* stateVars,
+					 const int numStateVars,
+					 const PylithScalar* totalStrain,
+					 const int strainSize,
+					 const PylithScalar* initialStress,
+					 const int initialStressSize,
+					 const PylithScalar* initialStrain,
+					 const int initialStrainSize)
+{ // _calcElasticConstsElastic
+  assert(elasticConsts);
+  assert(_DruckerPragerPlaneStrain::numElasticConsts == numElasticConsts);
+  assert(properties);
+  assert(_numPropsQuadPt == numProperties);
+  assert(stateVars);
+  assert(_numVarsQuadPt == numStateVars);
+  assert(totalStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == strainSize);
+  assert(initialStress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStressSize);
+  assert(initialStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStrainSize);
+ 
+  const PylithScalar mu = properties[p_mu];
+  const PylithScalar lambda = properties[p_lambda];
+
+  const PylithScalar mu2 = 2.0 * mu;
+  const PylithScalar lambda2mu = lambda + mu2;
+
+  elasticConsts[ 0] = lambda2mu; // C1111
+  elasticConsts[ 1] = lambda; // C1122
+  elasticConsts[ 2] = 0; // C1112
+  elasticConsts[ 3] = lambda; // C2211
+  elasticConsts[ 4] = lambda2mu; // C2222
+  elasticConsts[ 5] = 0; // C2212
+  elasticConsts[ 6] = 0; // C1211
+  elasticConsts[ 7] = 0; // C1222
+  elasticConsts[ 8] = mu2; // C1212
+
+  PetscLogFlops(2);
+} // _calcElasticConstsElastic
+
+// ----------------------------------------------------------------------
+// Compute derivative of elasticity matrix at location from properties
+// as an elastoplastic material.
+void
+pylith::materials::DruckerPragerPlaneStrain::_calcElasticConstsElastoplastic(
+				         PylithScalar* const elasticConsts,
+					 const int numElasticConsts,
+					 const PylithScalar* properties,
+					 const int numProperties,
+					 const PylithScalar* stateVars,
+					 const int numStateVars,
+					 const PylithScalar* totalStrain,
+					 const int strainSize,
+					 const PylithScalar* initialStress,
+					 const int initialStressSize,
+					 const PylithScalar* initialStrain,
+					 const int initialStrainSize)
+{ // _calcElasticConstsElastoplastic
+  assert(elasticConsts);
+  assert(_DruckerPragerPlaneStrain::numElasticConsts == numElasticConsts);
+  assert(properties);
+  assert(_numPropsQuadPt == numProperties);
+  assert(stateVars);
+  assert(_numVarsQuadPt == numStateVars);
+  assert(totalStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == strainSize);
+  assert(initialStress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStressSize);
+  assert(initialStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStrainSize);
+
+  // Duplicate functionality of _calcStressElastoplastic
+  // Get properties
+  const int tensorSize = 3;
+  const int tensorSizePS = 4;
+  const PylithScalar mu = properties[p_mu];
+  const PylithScalar lambda = properties[p_lambda];
+  const PylithScalar alphaYield = properties[p_alphaYield];
+  const PylithScalar beta = properties[p_beta];
+  const PylithScalar alphaFlow = properties[p_alphaFlow];
+
+  const PylithScalar mu2 = 2.0 * mu;
+  const PylithScalar bulkModulus = lambda + mu2/3.0;
+  const PylithScalar ae = 1.0/mu2;
+  const PylithScalar am = 1.0/(3.0 * bulkModulus);
+
+  const PylithScalar stressZZInitial = stateVars[s_stressZZInitial];
+  
+  // Get state variables from previous time step
+  const PylithScalar plasticStrainT[tensorSizePS] = {
+    stateVars[s_plasticStrain],
+    stateVars[s_plasticStrain + 1],
+    stateVars[s_plasticStrain + 2],
+    stateVars[s_plasticStrain + 3]};
+  const PylithScalar meanPlasticStrainT = (plasticStrainT[0] +
+					   plasticStrainT[1] +
+					   plasticStrainT[2])/3.0;
+  PylithScalar devPlasticStrainT[tensorSizePS];
+  calcDeviatoric2DPS(devPlasticStrainT, plasticStrainT, meanPlasticStrainT);
+
+  const PylithScalar diag[tensorSize] = { 1.0, 1.0, 0.0 };
+
+  // Initial stress values
+  const PylithScalar meanStressInitial = (initialStress[0] +
+					  initialStress[1] +
+					  stressZZInitial)/3.0;
+  const PylithScalar devStressInitial[tensorSizePS] = {
+    initialStress[0] - meanStressInitial,
+    initialStress[1] - meanStressInitial,
+    stressZZInitial - meanStressInitial,
+    initialStress[2]};
+
+  // Initial strain values
+  const PylithScalar meanStrainInitial = (initialStrain[0] +
+					  initialStrain[1])/3.0;
+  const PylithScalar devStrainInitial[tensorSizePS] = {
+    initialStrain[0] - meanStrainInitial,
+    initialStrain[1] - meanStrainInitial,
+    -meanStrainInitial,
+    initialStrain[2]};
+
+  // Values for current time step
+  const PylithScalar meanStrainTpdt = (totalStrain[0] + totalStrain[1])/3.0;
+  const PylithScalar meanStrainPPTpdt = meanStrainTpdt - meanPlasticStrainT -
+    meanStrainInitial;
+  
+  const PylithScalar strainPPTpdt[tensorSizePS] =
+    { totalStrain[0] - meanStrainTpdt - devPlasticStrainT[0] -
+      devStrainInitial[0],
+      totalStrain[1] - meanStrainTpdt - devPlasticStrainT[1] -
+      devStrainInitial[1],
+      -meanStrainTpdt - devPlasticStrainT[2] - devStrainInitial[2],
+      totalStrain[2] - devPlasticStrainT[3] - devStrainInitial[3]};
+  
+  // Compute trial elastic stresses and yield function to see if yield should
+  // occur.
+  const PylithScalar trialDevStress[tensorSizePS] = {
+    strainPPTpdt[0]/ae + devStressInitial[0],
+    strainPPTpdt[1]/ae + devStressInitial[1],
+    strainPPTpdt[2]/ae + devStressInitial[2],
+    strainPPTpdt[3]/ae + devStressInitial[3]};
+  const PylithScalar trialMeanStress = meanStrainPPTpdt/am + meanStressInitial;
+  const PylithScalar stressInvar2 =
+    sqrt(0.5 * scalarProduct2DPS(trialDevStress, trialDevStress));
+  const PylithScalar yieldFunction = 3.0 * alphaYield * trialMeanStress +
+    stressInvar2 - beta;
+#if 0 // DEBUGGING
+  std::cout << "Function _calcElasticConstsElastoPlastic:" << std::endl;
+  std::cout << "  alphaYield:       " << alphaYield << std::endl;
+  std::cout << "  beta:             " << beta << std::endl;
+  std::cout << "  trialMeanStress:  " << trialMeanStress << std::endl;
+  std::cout << "  stressInvar2:     " << stressInvar2 << std::endl;
+  std::cout << "  yieldFunction:    " << yieldFunction << std::endl;
+#endif
+  PetscLogFlops(62);
+  
+  // If yield function is greater than zero, compute elastoplastic stress and
+  // corresponding tangent matrix.
+  if (yieldFunction >= 0.0) {
+    const PylithScalar devStressInitialProd = 
+      scalarProduct2DPS(devStressInitial, devStressInitial);
+    const PylithScalar strainPPTpdtProd =
+      scalarProduct2DPS(strainPPTpdt, strainPPTpdt);
+    const PylithScalar d = 
+      sqrt(ae * ae * devStressInitialProd + 2.0 * ae *
+	   scalarProduct2DPS(devStressInitial, strainPPTpdt) +
+	   strainPPTpdtProd);
+    const PylithScalar plasticFac = 2.0 * ae * am/
+      (6.0 * alphaYield * alphaFlow * ae + am);
+    const PylithScalar meanStrainFac = 3.0 * alphaYield/am;
+    const PylithScalar dFac = 1.0/(sqrt(2.0) * ae);
+    const PylithScalar plasticMult = plasticFac *
+      (meanStrainFac * meanStrainPPTpdt + dFac * d - beta);
+
+    // Define some constants, vectors, and matrices.
+    const PylithScalar third = 1.0/3.0;
+    const PylithScalar dEdEpsilon[3][3] = {
+      { 2.0 * third,      -third,      0.0},
+      {      -third, 2.0 * third,      0.0},
+      {         0.0,         0.0,      1.0}};
+    const PylithScalar vec1[3] = {strainPPTpdt[0] + ae * devStressInitial[0],
+				  strainPPTpdt[1] + ae * devStressInitial[1],
+				  strainPPTpdt[3] + ae * devStressInitial[3]};
+    const PylithScalar dDdEpsilon[3] = {vec1[0]/d,
+					vec1[1]/d,
+					2.0 * vec1[2]/d};
+    const PylithScalar dLambdadEpsilon[3] = {
+      plasticFac * (alphaYield/am + dFac * dDdEpsilon[0]),
+      plasticFac * (alphaYield/am + dFac * dDdEpsilon[1]),
+      plasticFac * (                dFac * dDdEpsilon[2])};
+    
+    const PylithScalar dFac2 = 1.0/(sqrt(2.0) * d);
+    PylithScalar dDeltaEdEpsilon = 0.0;
+
+    // Compute elasticity matrix.
+    for (int iComp=0; iComp < tensorSize; ++iComp) {
+      for (int jComp=0; jComp < tensorSize; ++jComp) {
+	int iCount = jComp + tensorSize * iComp;
+	dDeltaEdEpsilon = dFac2 * (vec1[iComp] *
+				   (dLambdadEpsilon[jComp] -
+				    plasticMult * dDdEpsilon[jComp]/d) +
+				   plasticMult * dEdEpsilon[iComp][jComp]);
+	elasticConsts[iCount] = (dEdEpsilon[iComp][jComp] -
+				 dDeltaEdEpsilon)/ae +
+	  diag[iComp] * (third * diag[jComp] -
+			 alphaFlow * dLambdadEpsilon[jComp])/am;
+      } // for
+    } // for
+
+    PetscLogFlops(76 + tensorSize * tensorSize * 15);
+
+  } else {
+    // No plastic strain.
+    const PylithScalar lambda2mu = lambda + mu2;
+    elasticConsts[ 0] = lambda2mu; // C1111
+    elasticConsts[ 1] = lambda; // C1122
+    elasticConsts[ 2] = 0; // C1112
+    elasticConsts[ 3] = lambda; // C2211
+    elasticConsts[ 4] = lambda2mu; // C2222
+    elasticConsts[ 5] = 0; // C2212
+    elasticConsts[ 6] = 0; // C1211
+    elasticConsts[ 7] = 0; // C1222
+    elasticConsts[ 8] = mu2; // C1212
+
+    PetscLogFlops(1);
+  } // else
+
+} // _calcElasticConstsElastoplastic
+
+// ----------------------------------------------------------------------
+// Update state variables.
+void
+pylith::materials::DruckerPragerPlaneStrain::_updateStateVarsElastic(
+				    PylithScalar* const stateVars,
+				    const int numStateVars,
+				    const PylithScalar* properties,
+				    const int numProperties,
+				    const PylithScalar* totalStrain,
+				    const int strainSize,
+				    const PylithScalar* initialStress,
+				    const int initialStressSize,
+				    const PylithScalar* initialStrain,
+				    const int initialStrainSize)
+{ // _updateStateVarsElastic
+  assert(stateVars);
+  assert(_numVarsQuadPt == numStateVars);
+  assert(properties);
+  assert(_numPropsQuadPt == numProperties);
+  assert(totalStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == strainSize);
+  assert(initialStress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStressSize);
+  assert(initialStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStrainSize);
+
+  for (int iComp=0; iComp < 4; ++iComp) {
+    stateVars[s_plasticStrain+iComp] = 0.0;
+  } // for
+
+  _needNewJacobian = true;
+} // _updateStateVarsElastic
+
+// ----------------------------------------------------------------------
+// Update state variables.
+void
+pylith::materials::DruckerPragerPlaneStrain::_updateStateVarsElastoplastic(
+				    PylithScalar* const stateVars,
+				    const int numStateVars,
+				    const PylithScalar* properties,
+				    const int numProperties,
+				    const PylithScalar* totalStrain,
+				    const int strainSize,
+				    const PylithScalar* initialStress,
+				    const int initialStressSize,
+				    const PylithScalar* initialStrain,
+				    const int initialStrainSize)
+{ // _updateStateVarsElastoplastic
+  assert(stateVars);
+  assert(_numVarsQuadPt == numStateVars);
+  assert(properties);
+  assert(_numPropsQuadPt == numProperties);
+  assert(totalStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == strainSize);
+  assert(initialStress);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStressSize);
+  assert(initialStrain);
+  assert(_DruckerPragerPlaneStrain::tensorSize == initialStrainSize);
+
+  const int stressSize = _tensorSize;
+
+  // For now, we are duplicating the functionality of _calcStressElastoplastic,
+  // since otherwise we would have to redo a lot of calculations.
+
+  const int tensorSize = _tensorSize;
+  const int tensorSizePS = 4;
+  const PylithScalar mu = properties[p_mu];
+  const PylithScalar lambda = properties[p_lambda];
+  const PylithScalar alphaYield = properties[p_alphaYield];
+  const PylithScalar beta = properties[p_beta];
+  const PylithScalar alphaFlow = properties[p_alphaFlow];
+
+  const PylithScalar mu2 = 2.0 * mu;
+  const PylithScalar bulkModulus = lambda + mu2/3.0;
+  const PylithScalar ae = 1.0/mu2;
+  const PylithScalar am = 1.0/(3.0 * bulkModulus);
+
+  const PylithScalar stressZZInitial = stateVars[s_stressZZInitial];
+
+  const PylithScalar plasticStrainT[tensorSizePS] = {
+    stateVars[s_plasticStrain],
+    stateVars[s_plasticStrain + 1],
+    stateVars[s_plasticStrain + 2],
+    stateVars[s_plasticStrain + 3]};
+  const PylithScalar meanPlasticStrainT = (plasticStrainT[0] +
+					   plasticStrainT[1] +
+					   plasticStrainT[2])/3.0;
+  PylithScalar devPlasticStrainT[tensorSizePS];
+  calcDeviatoric2DPS(devPlasticStrainT, plasticStrainT, meanPlasticStrainT);
+
+  const PylithScalar diag[] = { 1.0, 1.0, 1.0, 0.0 };
+
+  // Initial stress values
+  const PylithScalar meanStressInitial = (initialStress[0] +
+					  initialStress[1] +
+					  stressZZInitial)/3.0;
+  const PylithScalar devStressInitial[tensorSizePS] = {
+    initialStress[0] - meanStressInitial,
+    initialStress[1] - meanStressInitial,
+    stressZZInitial - meanStressInitial,
+    initialStress[2]};
+
+  // Initial strain values
+  const PylithScalar meanStrainInitial = (initialStrain[0] +
+					  initialStrain[1])/3.0;
+  const PylithScalar devStrainInitial[tensorSizePS] = {
+    initialStrain[0] - meanStrainInitial,
+    initialStrain[1] - meanStrainInitial,
+    -meanStrainInitial,
+    initialStrain[2]};
+
+  // Values for current time step
+  const PylithScalar meanStrainTpdt = (totalStrain[0] + totalStrain[1])/3.0;
+  const PylithScalar meanStrainPPTpdt = meanStrainTpdt - meanPlasticStrainT -
+    meanStrainInitial;
+
+  const PylithScalar strainPPTpdt[tensorSizePS] =
+    { totalStrain[0] - meanStrainTpdt - devPlasticStrainT[0] -
+      devStrainInitial[0],
+      totalStrain[1] - meanStrainTpdt - devPlasticStrainT[1] -
+      devStrainInitial[1],
+      -meanStrainTpdt - devPlasticStrainT[2] - devStrainInitial[2],
+      totalStrain[2] - devPlasticStrainT[3] - devStrainInitial[3]};
+
+  // Compute trial elastic stresses and yield function to see if yield should
+  // occur.
+  const PylithScalar trialDevStress[tensorSizePS] = {
+    strainPPTpdt[0]/ae + devStressInitial[0],
+    strainPPTpdt[1]/ae + devStressInitial[1],
+    strainPPTpdt[2]/ae + devStressInitial[2],
+    strainPPTpdt[3]/ae + devStressInitial[3]};
+  const PylithScalar trialMeanStress = meanStrainPPTpdt/am + meanStressInitial;
+  const PylithScalar stressInvar2 =
+    sqrt(0.5 * scalarProduct2DPS(trialDevStress, trialDevStress));
+  const PylithScalar yieldFunction = 3.0 * alphaYield * trialMeanStress +
+    stressInvar2 - beta;
+#if 0 // DEBUGGING
+  std::cout << "Function _updateStateVarsElastoPlastic:" << std::endl;
+  std::cout << "  alphaYield:       " << alphaYield << std::endl;
+  std::cout << "  beta:             " << beta << std::endl;
+  std::cout << "  trialMeanStress:  " << trialMeanStress << std::endl;
+  std::cout << "  stressInvar2:     " << stressInvar2 << std::endl;
+  std::cout << "  yieldFunction:    " << yieldFunction << std::endl;
+#endif
+  PetscLogFlops(62);
+
+  // If yield function is greater than zero, compute plastic strains.
+  // Otherwise, plastic strains remain the same.
+  if (yieldFunction >= 0.0) {
+    const PylithScalar devStressInitialProd = 
+      scalarProduct2DPS(devStressInitial, devStressInitial);
+    const PylithScalar strainPPTpdtProd =
+      scalarProduct2DPS(strainPPTpdt, strainPPTpdt);
+    const PylithScalar d =
+      sqrt(ae * ae * devStressInitialProd + 2.0 * ae *
+	   scalarProduct2DPS(devStressInitial, strainPPTpdt) +
+	   strainPPTpdtProd);
+    const PylithScalar plasticMult = 2.0 * ae * am *
+      (3.0 * alphaYield * meanStrainPPTpdt/am + d/(sqrt(2.0) * ae) - beta)/
+      (6.0 * alphaYield * alphaFlow * ae + am);
+    const PylithScalar deltaMeanPlasticStrain = plasticMult * alphaFlow;
+    PylithScalar deltaDevPlasticStrain = 0.0;
+    for (int iComp=0; iComp < tensorSizePS; ++iComp) {
+      deltaDevPlasticStrain = plasticMult *(strainPPTpdt[iComp] +
+					    ae * devStressInitial[iComp])/
+	(sqrt(2.0) * d);
+      stateVars[s_plasticStrain+iComp] += deltaDevPlasticStrain +
+	diag[iComp] * deltaMeanPlasticStrain;
+    } // for
+
+    PetscLogFlops(48 + 9 * tensorSizePS);
+
+  } // if
+
+  _needNewJacobian = true;
+
+} // _updateStateVarsElastoplastic
+
+// End of file 

Copied: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.hh (from rev 19598, short/3D/PyLith/trunk/libsrc/pylith/materials/DruckerPragerPlaneStrain.hh)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.hh	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.hh	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,533 @@
+// -*- C++ -*-
+//
+// ----------------------------------------------------------------------
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ----------------------------------------------------------------------
+//
+
+/** @file libsrc/materials/DruckerPragerPlaneStrain.hh
+ *
+ * @brief 2-D, plane strain, Drucker-Prager elastic/perfectly plastic material. 
+ */
+
+#if !defined(pylith_materials_druckerpragerplanestrain_hh)
+#define pylith_materials_druckerpragerplanestrain_hh
+
+// Include directives ---------------------------------------------------
+#include "ElasticMaterial.hh" // ISA ElasticMaterial
+
+// DruckerPragerPlaneStrain ---------------------------------------------
+/** @brief 2-D, plane strain, Drucker-Prager elastic/perfectly plastic material.
+ *
+ * The physical properties are specified using density, shear-wave
+ * speed, friction angle, cohesion, dilatation angle, and
+ * compressional-wave speed.  The physical properties are stored
+ * internally using density, lambda, mu, which are directly related to
+ * the elasticity constants used in the finite-element
+ * integration. The plasticity information is retained as alpha_yield,
+ * beta, and alpha_flow.
+ */
+
+class pylith::materials::DruckerPragerPlaneStrain : public ElasticMaterial
+{ // class DruckerPragerPlaneStrain
+  friend class TestDruckerPragerPlaneStrain; // unit testing
+
+  // PUBLIC ENUMS ///////////////////////////////////////////////////////
+public :
+
+  enum FitMohrCoulombEnum {
+    MOHR_COULOMB_CIRCUMSCRIBED=0, 
+    MOHR_COULOMB_MIDDLE=1,
+    MOHR_COULOMB_INSCRIBED=2,
+  }; // FitMohrCoulombType
+
+  // PUBLIC METHODS /////////////////////////////////////////////////////
+public :
+
+  /// Default constructor
+  DruckerPragerPlaneStrain(void);
+
+  /// Destructor
+  ~DruckerPragerPlaneStrain(void);
+
+  /** Set fit to Mohr-Coulomb surface.
+   *
+   * @param value Mohr-Coulomb surface match type.
+   */
+  void fitMohrCoulomb(FitMohrCoulombEnum value);
+
+  /** Set current time step.
+   *
+   * @param dt Current time step.
+   */
+  void timeStep(const PylithScalar dt);
+
+  /** Set whether elastic or inelastic constitutive relations are used.
+   *
+   * @param flag True to use elastic, false to use inelastic.
+   */
+  void useElasticBehavior(const bool flag);
+
+
+  // PROTECTED METHODS //////////////////////////////////////////////////
+protected :
+
+  /** Compute properties from values in spatial database.
+   *
+   * Order of values in arrays matches order used in dbValues() and
+   * parameterNames().
+   *
+   * @param propValues Array of property values.
+   * @param dbValues Array of database values.
+   */
+  void _dbToProperties(PylithScalar* const propValues,
+		       const scalar_array& dbValues);
+
+  /** Nondimensionalize properties.
+   *
+   * @param values Array of property values.
+   * @param nvalues Number of values.
+   */
+  void _nondimProperties(PylithScalar* const values,
+			 const int nvalues) const;
+
+  /** Dimensionalize properties.
+   *
+   * @param values Array of property values.
+   * @param nvalues Number of values.
+   */
+  void _dimProperties(PylithScalar* const values,
+		      const int nvalues) const;
+
+  /** Compute initial state variables from values in spatial database.
+   *
+   * @param stateValues Array of state variable values.
+   * @param dbValues Array of database values.
+   */
+  void _dbToStateVars(PylithScalar* const stateValues,
+		      const scalar_array& dbValues);
+
+  /** Nondimensionalize state variables..
+   *
+   * @param values Array of state variables.
+   * @param nvalues Number of values.
+   */
+  void _nondimStateVars(PylithScalar* const values,
+			const int nvalues) const;
+
+  /** Dimensionalize state variables.
+   *
+   * @param values Array of state variables.
+   * @param nvalues Number of values.
+   */
+  void _dimStateVars(PylithScalar* const values,
+		     const int nvalues) const;
+
+  /** Compute density from properties.
+   *
+   * @param density Array for density.
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at location.
+   * @param numStateVars Number of state variables.
+   */
+  void _calcDensity(PylithScalar* const density,
+		    const PylithScalar* properties,
+		    const int numProperties,
+		    const PylithScalar* stateVars,
+		    const int numStateVars);
+
+  /** Compute stress tensor from properties and state variables. If
+   * the state variables are from the previous time step, then the
+   * computeStateVars flag should be set to true so that the state
+   * variables are updated (but not stored) when computing the stresses.
+   *
+   * @param stress Array for stress tensor.
+   * @param stressSize Size of stress tensor.
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at location.
+   * @param numStateVars Number of state variables.
+   * @param totalStrain Total strain at location.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   * @param computeStateVars Flag indicating to compute updated state variables.
+   */
+  void _calcStress(PylithScalar* const stress,
+		   const int stressSize,
+		   const PylithScalar* properties,
+		   const int numProperties,
+		   const PylithScalar* stateVars,
+		   const int numStateVars,
+		   const PylithScalar* totalStrain,
+		   const int strainSize,
+		   const PylithScalar* initialStress,
+		   const int initialStressSize,
+		   const PylithScalar* initialStrain,
+		   const int initialStrainSize,
+		   const bool computeStateVars);
+
+  /** Compute derivatives of elasticity matrix from properties.
+   *
+   * @param elasticConsts Array for elastic constants.
+   * @param numElasticConsts Number of elastic constants.
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at location.
+   * @param numStateVars Number of state variables.
+   * @param totalStrain Total strain at location.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   */
+  void _calcElasticConsts(PylithScalar* const elasticConsts,
+			  const int numElasticConsts,
+			  const PylithScalar* properties,
+			  const int numProperties,
+			  const PylithScalar* stateVars,
+			  const int numStateVars,
+			  const PylithScalar* totalStrain,
+			  const int strainSize,
+		          const PylithScalar* initialStress,
+		          const int initialStressSize,
+		          const PylithScalar* initialStrain,
+		          const int initialStrainSize);
+
+  /** Get stable time step for implicit time integration.
+   *
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at location.
+   * @param numStateVars Number of state variables.
+   *
+   * @returns Time step
+   */
+  PylithScalar _stableTimeStepImplicit(const PylithScalar* properties,
+				 const int numProperties,
+				 const PylithScalar* stateVars,
+				 const int numStateVars) const;
+
+  /** Update state variables (for next time step).
+   *
+   * @param stateVars State variables at location.
+   * @param numStateVars Number of state variables.
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param totalStrain Total strain at location.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   */
+  void _updateStateVars(PylithScalar* const stateVars,
+			const int numStateVars,
+			const PylithScalar* properties,
+			const int numProperties,
+			const PylithScalar* totalStrain,
+			const int strainSize,
+			const PylithScalar* initialStress,
+			const int initialStressSize,
+			const PylithScalar* initialStrain,
+			const int initialStrainSize);
+
+  // PRIVATE TYPEDEFS ///////////////////////////////////////////////////
+private :
+
+  /// Member prototype for _calcStress()
+  typedef void (pylith::materials::DruckerPragerPlaneStrain::*calcStress_fn_type)
+    (PylithScalar* const,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const bool);
+
+  /// Member prototype for _calcElasticConsts()
+  typedef void (pylith::materials::DruckerPragerPlaneStrain::*calcElasticConsts_fn_type)
+    (PylithScalar* const,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int);
+
+  /// Member prototype for _updateStateVars()
+  typedef void (pylith::materials::DruckerPragerPlaneStrain::*updateStateVars_fn_type)
+    (PylithScalar* const,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int,
+     const PylithScalar*,
+     const int);
+
+  // PRIVATE METHODS ////////////////////////////////////////////////////
+private :
+
+  /** Compute stress tensor from properties as an elastic material.
+   *
+   * @param stress Array for stress tensor.
+   * @param stressSize Size of stress tensor.
+   * @param properties Properties at locations.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at locations.
+   * @param numStateVars Number of state variables.
+   * @param totalStrain Total strain at locations.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   * @param computeStateVars Flag indicating to compute updated state vars.
+   */
+  void _calcStressElastic(PylithScalar* const stress,
+			  const int stressSize,
+			  const PylithScalar* properties,
+			  const int numProperties,
+			  const PylithScalar* stateVars,
+			  const int numStateVars,
+			  const PylithScalar* totalStrain,
+			  const int strainSize,
+			  const PylithScalar* initialStress,
+			  const int initialStressSize,
+			  const PylithScalar* initialStrain,
+			  const int initialStrainSize,
+			  const bool computeStateVars);
+
+  /** Compute stress tensor from properties as an elastoplastic material.
+   *
+   * @param stress Array for stress tensor.
+   * @param stressSize Size of stress tensor.
+   * @param properties Properties at locations.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at locations.
+   * @param numStateVars Number of state variables.
+   * @param totalStrain Total strain at locations.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   * @param computeStateVars Flag indicating to compute updated state vars.
+   */
+  void _calcStressElastoplastic(PylithScalar* const stress,
+				const int stressSize,
+				const PylithScalar* properties,
+				const int numProperties,
+				const PylithScalar* stateVars,
+				const int numStateVars,
+				const PylithScalar* totalStrain,
+				const int strainSize,
+				const PylithScalar* initialStress,
+				const int initialStressSize,
+				const PylithScalar* initialStrain,
+				const int initialStrainSize,
+				const bool computeStateVars);
+
+  /** Compute derivatives of elasticity matrix from properties as an
+   * elastic material.
+   *
+   * @param elasticConsts Array for elastic constants.
+   * @param numElasticConsts Number of elastic constants.
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at locations.
+   * @param numStateVars Number of state variables.
+   * @param totalStrain Total strain at location.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   */
+  void _calcElasticConstsElastic(PylithScalar* const elasticConsts,
+				 const int numElasticConsts,
+				 const PylithScalar* properties,
+				 const int numProperties,
+				 const PylithScalar* stateVars,
+				 const int numStateVars,
+				 const PylithScalar* totalStrain,
+				 const int strainSize,
+				 const PylithScalar* initialStress,
+				 const int initialStressSize,
+				 const PylithScalar* initialStrain,
+				 const int initialStrainSize);
+
+  /** Compute derivatives of elasticity matrix from properties as an
+   * elastoplastic material.
+   *
+   * @param elasticConsts Array for elastic constants.
+   * @param numElasticConsts Number of elastic constants.
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param stateVars State variables at locations.
+   * @param numStateVars Number of state variables.
+   * @param totalStrain Total strain at location.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   */
+  void _calcElasticConstsElastoplastic(PylithScalar* const elasticConsts,
+				       const int numElasticConsts,
+				       const PylithScalar* properties,
+				       const int numProperties,
+				       const PylithScalar* stateVars,
+				       const int numStateVars,
+				       const PylithScalar* totalStrain,
+				       const int strainSize,
+				       const PylithScalar* initialStress,
+				       const int initialStressSize,
+				       const PylithScalar* initialStrain,
+				       const int initialStrainSize);
+  
+  /** Update state variables after solve as an elastic material.
+   *
+   * @param stateVars State variables at locations.
+   * @param numStateVars Number of state variables.
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param totalStrain Total strain at location.
+   * @param strainSize Size of strain tensor.
+   * @param initialStress Initial stress values.
+   * @param initialStressSize Size of initial stress array.
+   * @param initialStrain Initial strain values.
+   * @param initialStrainSize Size of initial strain array.
+   */
+  void _updateStateVarsElastic(PylithScalar* const stateVars,
+			       const int numStateVars,
+			       const PylithScalar* properties,
+			       const int numProperties,
+			       const PylithScalar* totalStrain,
+			       const int strainSize,
+			       const PylithScalar* initialStress,
+			       const int initialStressSize,
+			       const PylithScalar* initialStrain,
+			       const int initialStrainSize);
+
+  /** Update state variables after solve as an elastoplastic material.
+   *
+   * @param properties Properties at location.
+   * @param numProperties Number of properties.
+   * @param totalStrain Total strain at location.
+   * @param strainSize Size of strain tensor.
+   * @param initialState Initial state values.
+   * @param initialStateSize Size of initial state array.
+   */
+  void _updateStateVarsElastoplastic(PylithScalar* const stateVars,
+				     const int numStateVars,
+				     const PylithScalar* properties,
+				     const int numProperties,
+				     const PylithScalar* totalStrain,
+				     const int strainSize,
+				     const PylithScalar* initialStress,
+				     const int initialStressSize,
+				     const PylithScalar* initialStrain,
+				     const int initialStrainSize);
+
+  /** Compute scalar product, assuming vector form of a tensor.
+   *
+   * @param tensor1 First tensor.
+   * @param tensor2 Second tensor.
+   */
+  /*
+  PylithScalar _scalarProduct(const PylithScalar* tensor1,
+			const PylithScalar* tensor2) const;
+  */
+
+  /** Compute tensor mean, assuming vector form of a tensor.
+   *
+   * @param vec Tensor represented as a vector.
+   */
+  PylithScalar _calcMean(const PylithScalar* vec) const;
+
+  /** Compute deviatoric components, assuming vector form of a tensor.
+   *
+   * @param vec Tensor represented as a vector.
+   * @param vecMean Tensor mean.
+   */
+  PylithScalar _calcDeviatoric(const PylithScalar* vec,
+			 const PylithScalar vecMean) const;
+
+
+  // PRIVATE MEMBERS ////////////////////////////////////////////////////
+private :
+
+  /// Method to use for _calcElasticConsts().
+  calcElasticConsts_fn_type _calcElasticConstsFn;
+
+  /// Method to use for _calcStress().
+  calcStress_fn_type _calcStressFn;
+
+  /// Method to use for _updateStateVars().
+  updateStateVars_fn_type _updateStateVarsFn;
+
+  /// Fit to Mohr Coulomb surface
+  FitMohrCoulombEnum _fitMohrCoulomb;
+
+  static const int p_density;
+  static const int p_mu;
+  static const int p_lambda;
+  static const int p_alphaYield;
+  static const int p_beta;
+  static const int p_alphaFlow;
+  static const int db_density;
+  static const int db_vs;
+  static const int db_vp;
+  static const int db_frictionAngle;
+  static const int db_cohesion;
+  static const int db_dilatationAngle;
+
+  static const int s_stressZZInitial;
+  static const int s_plasticStrain;
+  static const int db_stressZZInitial;
+  static const int db_plasticStrain;
+
+  // NOT IMPLEMENTED ////////////////////////////////////////////////////
+private :
+
+  DruckerPragerPlaneStrain(const DruckerPragerPlaneStrain&); ///< Not implemented
+  const DruckerPragerPlaneStrain& operator=(const DruckerPragerPlaneStrain&); ///< Not implemented
+
+}; // class DruckerPragerPlaneStrain
+
+#include "DruckerPragerPlaneStrain.icc" // inline methods
+
+#endif // pylith_materials_druckerpragerplanestrain_hh
+
+
+// End of file 

Copied: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.icc (from rev 19598, short/3D/PyLith/trunk/libsrc/pylith/materials/DruckerPragerPlaneStrain.icc)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.icc	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/DruckerPragerPlaneStrain.icc	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,112 @@
+// -*- C++ -*-
+//
+// ----------------------------------------------------------------------
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ----------------------------------------------------------------------
+//
+
+#if !defined(pylith_materials_druckerpragerplanestrain_hh)
+#error "DruckerPragerPlaneStrain.icc can only be included from DruckerPragerPlaneStrain.hh"
+#endif
+
+#include <cassert> // USES assert()
+#include "pylith/utils/macrodefs.h" // USES CALL_MEMBER_FN
+
+// Set current time step.
+inline
+void
+pylith::materials::DruckerPragerPlaneStrain::timeStep(const PylithScalar dt) {
+  // Not sure what to do here.  If we are using full Newton the Jacobian will
+  // always need reforming, but SNES may opt not to reform it sometimes.
+  _needNewJacobian = true;
+  _dt = dt;
+} // timeStep
+
+// Compute stress tensor from parameters.
+inline
+void
+pylith::materials::DruckerPragerPlaneStrain::_calcStress(PylithScalar* const stress,
+						const int stressSize,
+						const PylithScalar* properties,
+						const int numProperties,
+						const PylithScalar* stateVars,
+						const int numStateVars,
+						const PylithScalar* totalStrain,
+						const int strainSize,
+						const PylithScalar* initialStress,
+						const int initialStressSize,
+						const PylithScalar* initialStrain,
+						const int initialStrainSize,
+						const bool computeStateVars)
+{
+  assert(0 != _calcStressFn);
+  CALL_MEMBER_FN(*this, _calcStressFn)(stress, stressSize, 
+				       properties, numProperties,
+				       stateVars, numStateVars,
+				       totalStrain, strainSize,
+				       initialStress, initialStressSize,
+				       initialStrain, initialStrainSize,
+				       computeStateVars);
+} // _calcStress
+
+// Compute derivatives of elasticity matrix from parameters.
+inline
+void
+pylith::materials::DruckerPragerPlaneStrain::_calcElasticConsts(
+					PylithScalar* const elasticConsts,
+					const int numElasticConsts,
+					const PylithScalar* properties,
+					const int numProperties,
+					const PylithScalar* stateVars,
+					const int numStateVars,
+					const PylithScalar* totalStrain,
+					const int strainSize,
+					const PylithScalar* initialStress,
+					const int initialStressSize,
+					const PylithScalar* initialStrain,
+					const int initialStrainSize)
+{
+  assert(0 != _calcElasticConstsFn);
+  CALL_MEMBER_FN(*this, _calcElasticConstsFn)(elasticConsts, numElasticConsts,
+					      properties, numProperties,
+					      stateVars, numStateVars,
+					      totalStrain, strainSize,
+					      initialStress, initialStressSize,
+					      initialStrain, initialStrainSize);
+} // _calcElasticConsts
+
+// Update state variables after solve.
+inline
+void
+pylith::materials::DruckerPragerPlaneStrain::_updateStateVars(
+					PylithScalar* const stateVars,
+					const int numStateVars,
+					const PylithScalar* properties,
+					const int numProperties,
+					const PylithScalar* totalStrain,
+					const int strainSize,
+					const PylithScalar* initialStress,
+					const int initialStressSize,
+					const PylithScalar* initialStrain,
+					const int initialStrainSize)
+{
+  assert(0 != _updateStateVarsFn);
+  CALL_MEMBER_FN(*this, _updateStateVarsFn)(stateVars, numStateVars,
+					    properties, numProperties,
+					    totalStrain, strainSize,
+					    initialStress, initialStressSize,
+					    initialStrain, initialStrainSize);
+} // _updateStateVars
+
+// End of file 

Modified: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.hh
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.hh	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.hh	2012-02-07 21:21:03 UTC (rev 19599)
@@ -329,6 +329,17 @@
   void calcDeviatoric2D(PylithScalar* const deviatoric,
 			const PylithScalar* vec,
 			const PylithScalar vecMean);
+
+  /** Compute 2D deviatoric stress/strain from vector (length 4) and mean value.
+   *
+   * @param deviatoric Array for deviatoric tensor.
+   * @param vec Input tensor (as vector).
+   * @param vecMean Tensor trace divided by spatial_dimension.
+   */
+  static
+  void calcDeviatoric2DPS(PylithScalar* const deviatoric,
+			  const PylithScalar* vec,
+			  const PylithScalar vecMean);
   
   /** Compute 3D deviatoric stress/strain from vector and mean value.
    *
@@ -350,6 +361,16 @@
   PylithScalar scalarProduct2D(const PylithScalar* tensor1,
 			       const PylithScalar* tensor2);
   
+  /** Compute 2D scalar product of two tensors represented as vectors of
+   * length 4.
+   *
+   * @param tensor1 First tensor.
+   * @param tensor2 Second tensor.
+   */
+  static
+  PylithScalar scalarProduct2DPS(const PylithScalar* tensor1,
+				 const PylithScalar* tensor2);
+  
   /** Compute 3D scalar product of two tensors represented as vectors.
    *
    * @param tensor1 First tensor.

Modified: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.icc
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.icc	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/ElasticMaterial.icc	2012-02-07 21:21:03 UTC (rev 19599)
@@ -71,6 +71,22 @@
   deviatoric[2] = vec[2];
 } // calcDeviatoric2D
 
+// Compute 2D deviatoric stress/strain from vector and mean value.
+// In this case all 3 normal components are present, but only one shear comp.
+// 3 FLOPs per call
+inline
+void
+pylith::materials::ElasticMaterial::calcDeviatoric2DPS(
+					PylithScalar* const deviatoric,
+					const PylithScalar* vec,
+					const PylithScalar vecMean)
+{
+  deviatoric[0] = vec[0] - vecMean;
+  deviatoric[1] = vec[1] - vecMean;
+  deviatoric[2] = vec[2] - vecMean;
+  deviatoric[3] = vec[3];
+} // calcDeviatoric2D
+
 // Compute 3D deviatoric stress/strain from vector and mean value.
 // 3 FLOPs per call
 inline
@@ -105,6 +121,25 @@
 } // scalarProduct2D
 
 
+// Compute 2DPS scalar product of two tensors represented as vectors.
+// In this case all 3 normal components are present, but only one shear comp.
+// 8 FLOPs per call.
+inline
+PylithScalar
+pylith::materials::ElasticMaterial::scalarProduct2DPS(
+						 const PylithScalar* tensor1,
+						 const PylithScalar* tensor2)
+{ // scalarProduct2DPS
+  const PylithScalar scalarProduct = 
+    tensor1[0] * tensor2[0] +
+    tensor1[1] * tensor2[1] + 
+    tensor1[2] * tensor2[2] + 
+    2.0 * tensor1[3] * tensor2[3];
+
+  return scalarProduct;
+} // scalarProduct2DPS
+
+
 // Compute 3D scalar product of two tensors represented as vectors.
 // 12 FLOPs per call.
 inline

Modified: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/Makefile.am
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/Makefile.am	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/Makefile.am	2012-02-07 21:21:03 UTC (rev 19599)
@@ -42,6 +42,8 @@
 	PowerLaw3D.icc \
 	DruckerPrager3D.hh \
 	DruckerPrager3D.icc \
+	DruckerPragerPlaneStrain.hh \
+	DruckerPragerPlaneStrain.icc \
 	Metadata.hh \
 	Metadata.icc \
 	Material.hh \

Modified: short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/materialsfwd.hh
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/materialsfwd.hh	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/libsrc/pylith/materials/materialsfwd.hh	2012-02-07 21:21:03 UTC (rev 19599)
@@ -48,6 +48,7 @@
     class GenMaxwellQpQsIsotropic3D;
     class PowerLaw3D;
     class DruckerPrager3D;
+    class DruckerPragerPlaneStrain;
 
     class EffectiveStress;
     class ViscoelasticMaxwell;

Copied: short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/DruckerPragerPlaneStrain.i (from rev 19598, short/3D/PyLith/trunk/modulesrc/materials/DruckerPragerPlaneStrain.i)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/DruckerPragerPlaneStrain.i	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/DruckerPragerPlaneStrain.i	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,239 @@
+// -*- C++ -*-
+//
+// ----------------------------------------------------------------------
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ----------------------------------------------------------------------
+//
+
+/** @file modulesrc/materials/DruckerPragerPlaneStrain.i
+ *
+ * @brief Python interface to C++ DruckerPragerPlaneStrain object.
+ */
+
+namespace pylith {
+  namespace materials {
+
+    class pylith::materials::DruckerPragerPlaneStrain : public ElasticMaterial
+    { // class DruckerPragerPlaneStrain
+
+      // PUBLIC ENUMS ///////////////////////////////////////////////////
+    public :
+
+      enum FitMohrCoulombEnum {
+	MOHR_COULOMB_CIRCUMSCRIBED=0, 
+	MOHR_COULOMB_MIDDLE=1,
+	MOHR_COULOMB_INSCRIBED=2,
+      }; // FitMohrCoulombType
+
+      // PUBLIC METHODS /////////////////////////////////////////////////
+    public :
+
+      /// Default constructor
+      DruckerPragerPlaneStrain(void);
+      
+      /// Destructor
+      ~DruckerPragerPlaneStrain(void);
+      
+      /** Set fit to Mohr-Coulomb surface.
+       *
+       * @param value Mohr-Coulomb surface match type.
+       */
+      void fitMohrCoulomb(FitMohrCoulombEnum value);
+
+      /** Set current time step.
+       *
+       * @param dt Current time step.
+       */
+      void timeStep(const PylithScalar dt);
+      
+      /** Set whether elastic or inelastic constitutive relations are used.
+       *
+       * @param flag True to use elastic, false to use inelastic.
+       */
+      void useElasticBehavior(const bool flag);
+      
+      // PROTECTED METHODS //////////////////////////////////////////////
+    protected :
+
+      /** Compute properties from values in spatial database.
+       *
+       * Order of values in arrays matches order used in dbValues() and
+       * parameterNames().
+       *
+       * @param propValues Array of property values.
+       * @param dbValues Array of database values.
+       */
+      void _dbToProperties(PylithScalar* const propValues,
+			   const pylith::scalar_array& dbValues);
+      
+      /** Nondimensionalize properties.
+       *
+       * @param values Array of property values.
+       * @param nvalues Number of values.
+       */
+      void _nondimProperties(PylithScalar* const values,
+			     const int nvalues) const;
+      
+      /** Dimensionalize properties.
+       *
+       * @param values Array of property values.
+       * @param nvalues Number of values.
+       */
+      void _dimProperties(PylithScalar* const values,
+			  const int nvalues) const;
+      
+      /** Compute initial state variables from values in spatial database.
+       *
+       * @param stateValues Array of state variable values.
+       * @param dbValues Array of database values.
+       */
+      void _dbToStateVars(PylithScalar* const stateValues,
+			  const pylith::scalar_array& dbValues);
+      
+      /** Nondimensionalize state variables..
+       *
+       * @param values Array of state variables.
+       * @param nvalues Number of values.
+       */
+      void _nondimStateVars(PylithScalar* const values,
+			    const int nvalues) const;
+      
+      /** Dimensionalize state variables.
+       *
+       * @param values Array of state variables.
+       * @param nvalues Number of values.
+       */
+      void _dimStateVars(PylithScalar* const values,
+			 const int nvalues) const;
+      
+      /** Compute density from properties.
+       *
+       * @param density Array for density.
+       * @param properties Properties at location.
+       * @param numProperties Number of properties.
+       * @param stateVars State variables at location.
+       * @param numStateVars Number of state variables.
+       */
+      void _calcDensity(PylithScalar* const density,
+			const PylithScalar* properties,
+			const int numProperties,
+			const PylithScalar* stateVars,
+			const int numStateVars);
+      
+      /** Compute stress tensor from properties and state variables. If
+       * the state variables are from the previous time step, then the
+       * computeStateVars flag should be set to true so that the state
+       * variables are updated (but not stored) when computing the stresses.
+       *
+       * @param stress Array for stress tensor.
+       * @param stressSize Size of stress tensor.
+       * @param properties Properties at location.
+       * @param numProperties Number of properties.
+       * @param stateVars State variables at location.
+       * @param numStateVars Number of state variables.
+       * @param totalStrain Total strain at location.
+       * @param strainSize Size of strain tensor.
+       * @param initialStress Initial stress values.
+       * @param initialStressSize Size of initial stress array.
+       * @param initialStrain Initial strain values.
+       * @param initialStrainSize Size of initial strain array.
+       * @param computeStateVars Flag indicating to compute updated
+       * state variables.
+       */
+      void _calcStress(PylithScalar* const stress,
+		       const int stressSize,
+		       const PylithScalar* properties,
+		       const int numProperties,
+		       const PylithScalar* stateVars,
+		       const int numStateVars,
+		       const PylithScalar* totalStrain,
+		       const int strainSize,
+		       const PylithScalar* initialStress,
+		       const int initialStressSize,
+		       const PylithScalar* initialStrain,
+		       const int initialStrainSize,
+		       const bool computeStateVars);
+      
+      /** Compute derivatives of elasticity matrix from properties.
+       *
+       * @param elasticConsts Array for elastic constants.
+       * @param numElasticConsts Number of elastic constants.
+       * @param properties Properties at location.
+       * @param numProperties Number of properties.
+       * @param stateVars State variables at location.
+       * @param numStateVars Number of state variables.
+       * @param totalStrain Total strain at location.
+       * @param strainSize Size of strain tensor.
+       * @param initialStress Initial stress values.
+       * @param initialStressSize Size of initial stress array.
+       * @param initialStrain Initial strain values.
+       * @param initialStrainSize Size of initial strain array.
+       */
+      void _calcElasticConsts(PylithScalar* const elasticConsts,
+			      const int numElasticConsts,
+			      const PylithScalar* properties,
+			      const int numProperties,
+			      const PylithScalar* stateVars,
+			      const int numStateVars,
+			      const PylithScalar* totalStrain,
+			      const int strainSize,
+			      const PylithScalar* initialStress,
+			      const int initialStressSize,
+			      const PylithScalar* initialStrain,
+			      const int initialStrainSize);
+      
+      /** Get stable time step for implicit time integration.
+       *
+       * @param properties Properties at location.
+       * @param numProperties Number of properties.
+       * @param stateVars State variables at location.
+       * @param numStateVars Number of state variables.
+       *
+       * @returns Time step
+       */
+      PylithScalar _stableTimeStepImplicit(const PylithScalar* properties,
+				     const int numProperties,
+				     const PylithScalar* stateVars,
+				     const int numStateVars) const;
+      
+      /** Update state variables (for next time step).
+       *
+       * @param stateVars State variables at location.
+       * @param numStateVars Number of state variables.
+       * @param properties Properties at location.
+       * @param numProperties Number of properties.
+       * @param totalStrain Total strain at location.
+       * @param strainSize Size of strain tensor.
+       * @param initialStress Initial stress values.
+       * @param initialStressSize Size of initial stress array.
+       * @param initialStrain Initial strain values.
+       * @param initialStrainSize Size of initial strain array.
+       */
+      void _updateStateVars(PylithScalar* const stateVars,
+			    const int numStateVars,
+			    const PylithScalar* properties,
+			    const int numProperties,
+			    const PylithScalar* totalStrain,
+			    const int strainSize,
+			    const PylithScalar* initialStress,
+			    const int initialStressSize,
+			    const PylithScalar* initialStrain,
+			    const int initialStrainSize);
+
+    }; // class DruckerPragerPlaneStrain
+
+  } // materials
+} // pylith
+
+// End of file 

Modified: short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/Makefile.am
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/Makefile.am	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/Makefile.am	2012-02-07 21:21:03 UTC (rev 19599)
@@ -38,7 +38,8 @@
 	GenMaxwellPlaneStrain.i \
 	GenMaxwellQpQsIsotropic3D.i \
 	PowerLaw3D.i \
-	DruckerPrager3D.i
+	DruckerPrager3D.i \
+	DruckerPragerPlaneStrain.i
 
 swigincludedir = $(pkgdatadir)/swig/$(subpackage)
 swiginclude_HEADERS = \

Modified: short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/materials.i
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/materials.i	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/modulesrc/materials/materials.i	2012-02-07 21:21:03 UTC (rev 19599)
@@ -39,6 +39,7 @@
 #include "pylith/materials/GenMaxwellQpQsIsotropic3D.hh"
 #include "pylith/materials/PowerLaw3D.hh"
 #include "pylith/materials/DruckerPrager3D.hh"
+#include "pylith/materials/DruckerPragerPlaneStrain.hh"
 
 #include "pylith/utils/arrayfwd.hh"
 #include "pylith/utils/sievetypes.hh"
@@ -82,6 +83,7 @@
 %include "GenMaxwellQpQsIsotropic3D.i"
 %include "PowerLaw3D.i"
 %include "DruckerPrager3D.i"
+%include "DruckerPragerPlaneStrain.i"
 
 
 // End of file

Modified: short/3D/PyLith/branches/pylith-scecdynrup/pylith/Makefile.am
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/pylith/Makefile.am	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/pylith/Makefile.am	2012-02-07 21:21:03 UTC (rev 19599)
@@ -86,6 +86,7 @@
 	materials/MaxwellPlaneStrain.py \
 	materials/PowerLaw3D.py \
 	materials/DruckerPrager3D.py \
+	materials/DruckerPragerPlaneStrain.py \
 	meshio/__init__.py \
 	meshio/CellFilter.py \
 	meshio/CellFilterAvgMesh.py \

Copied: short/3D/PyLith/branches/pylith-scecdynrup/pylith/materials/DruckerPragerPlaneStrain.py (from rev 19598, short/3D/PyLith/trunk/pylith/materials/DruckerPragerPlaneStrain.py)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/pylith/materials/DruckerPragerPlaneStrain.py	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/pylith/materials/DruckerPragerPlaneStrain.py	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,130 @@
+#!/usr/bin/env python
+#
+# ----------------------------------------------------------------------
+#
+# Brad T. Aagaard, U.S. Geological Survey
+# Charles A. Williams, GNS Science
+# Matthew G. Knepley, University of Chicago
+#
+# This code was developed as part of the Computational Infrastructure
+# for Geodynamics (http://geodynamics.org).
+#
+# Copyright (c) 2010-2011 University of California, Davis
+#
+# See COPYING for license information.
+#
+# ----------------------------------------------------------------------
+#
+
+## @file pylith/materials/DruckerPragerPlaneStrain.py
+##
+## @brief Python object implementing 2-D plane strain Drucker-Prager
+## elastoplastic material.
+##
+## Factory: material.
+
+from ElasticMaterial import ElasticMaterial
+from materials import DruckerPragerPlaneStrain as ModuleDruckerPragerPlaneStrain
+
+# Validator to fit to Mohr-Coulomb
+def validateFitMohrCoulomb(value):
+  """
+  Validate fit to Mohr-Coulomb yield surface.
+  """
+  if not value in ["inscribed", "middle", "circumscribed"]:
+    raise ValueError("Unknown fit to Mohr-Coulomb yield surface.")
+  return value
+
+
+# DruckerPragerPlaneStrain class
+class DruckerPragerPlaneStrain(ElasticMaterial, ModuleDruckerPragerPlaneStrain):
+  """
+  Python object implementing 2-D plane strain Drucker-Prager elastoplastic
+  material.
+
+  Factory: material.
+  """
+
+  # INVENTORY //////////////////////////////////////////////////////////
+
+  class Inventory(ElasticMaterial.Inventory):
+    """
+    Python object for managing DruckerPragerPlaneStrain facilities and
+    properties.
+    """
+    
+    ## @class Inventory
+    ## Python object for managing DruckerPragerPlaneStrain facilities and
+    ## properties.
+    ##
+    ## \b Properties
+    ## @li \b fit_mohr_coulomb Fit to Mohr-Coulomb yield surface.
+    ##
+    ## \b Facilities
+    ## @li None
+
+    import pyre.inventory
+
+    from pylith.meshio.OutputMatElastic import OutputMatElastic
+    fitMohrCoulomb = pyre.inventory.str("fit_mohr_coulomb", default="inscribed",
+                                        validator=validateFitMohrCoulomb)
+    fitMohrCoulomb.meta['tip'] = "Fit to Mohr-Coulomb yield surface."
+
+
+  # PUBLIC METHODS /////////////////////////////////////////////////////
+
+  def __init__(self, name="druckerpragerplanestrain"):
+    """
+    Constructor.
+    """
+    ElasticMaterial.__init__(self, name)
+    self.availableFields = \
+        {'vertex': \
+           {'info': [],
+            'data': []},
+         'cell': \
+           {'info': ["mu", "lambda", "density", 
+                     "alpha_yield", "beta", "alpha_flow"],
+            'data': ["total_strain", "stress", "stress_zz_initial",
+                     "plastic_strain"]}}
+    self._loggingPrefix = "MaDP2D "
+    return
+
+
+  # PRIVATE METHODS ////////////////////////////////////////////////////
+
+  def _configure(self):
+    """
+    Setup members using inventory.
+    """
+    ElasticMaterial._configure(self)
+    if self.inventory.fitMohrCoulomb == "inscribed":
+      fitEnum = ModuleDruckerPragerPlaneStrain.MOHR_COULOMB_INSCRIBED
+    elif self.inventory.fitMohrCoulomb == "middle":
+      fitEnum = ModuleDruckerPragerPlaneStrain.MOHR_COULOMB_MIDDLE
+    elif self.inventory.fitMohrCoulomb == "circumscribed":
+      fitEnum = ModuleDruckerPragerPlaneStrain.MOHR_COULOMB_CIRCUMSCRIBED
+    else:
+      raise ValueError("Unknown fit to Mohr-Coulomb yield surface.")
+    ModuleDruckerPragerPlaneStrain.fitMohrCoulomb(self, fitEnum)
+    return
+
+  
+  def _createModuleObj(self):
+    """
+    Call constructor for module object for access to C++ object.
+    """
+    ModuleDruckerPragerPlaneStrain.__init__(self)
+    return
+  
+
+# FACTORIES ////////////////////////////////////////////////////////////
+
+def material():
+  """
+  Factory associated with DruckerPragerPlaneStrain.
+  """
+  return DruckerPragerPlaneStrain()
+
+
+# End of file 

Modified: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/Makefile.am
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/Makefile.am	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/Makefile.am	2012-02-07 21:21:03 UTC (rev 19599)
@@ -42,6 +42,7 @@
 	TestGenMaxwellQpQsIsotropic3D.cc \
 	TestPowerLaw3D.cc \
 	TestDruckerPrager3D.cc \
+	TestDruckerPragerPlaneStrain.cc \
 	TestEffectiveStress.cc \
 	test_materials.cc
 
@@ -62,6 +63,7 @@
 	TestMaxwellPlaneStrain.hh \
 	TestPowerLaw3D.hh \
 	TestDruckerPrager3D.hh \
+	TestDruckerPragerPlaneStrain.hh \
 	TestEffectiveStress.hh
 
 # Source files associated with testing data
@@ -86,7 +88,9 @@
 	data/PowerLaw3DElasticData.cc \
 	data/PowerLaw3DTimeDepData.cc \
 	data/DruckerPrager3DElasticData.cc \
-	data/DruckerPrager3DTimeDepData.cc
+	data/DruckerPrager3DTimeDepData.cc \
+	data/DruckerPragerPlaneStrainElasticData.cc \
+	data/DruckerPragerPlaneStrainTimeDepData.cc
 
 
 noinst_HEADERS += \
@@ -111,6 +115,8 @@
 	data/PowerLaw3DTimeDepData.hh \
 	data/DruckerPrager3DElasticData.hh \
 	data/DruckerPrager3DTimeDepData.hh \
+	data/DruckerPragerPlaneStrainElasticData.hh \
+	data/DruckerPragerPlaneStrainTimeDepData.hh \
 	data/header.hh
 
 AM_CPPFLAGS = \

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.cc (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/TestDruckerPragerPlaneStrain.cc)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.cc	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.cc	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,240 @@
+// -*- C++ -*-
+//
+// ----------------------------------------------------------------------
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ----------------------------------------------------------------------
+//
+
+#include <portinfo>
+
+#include "TestDruckerPragerPlaneStrain.hh" // Implementation of class methods
+
+#include "data/DruckerPragerPlaneStrainElasticData.hh" // USES DruckerPragerPlaneStrainElasticData
+#include "data/DruckerPragerPlaneStrainTimeDepData.hh" // USES DruckerPragerPlaneStrainTimeDepData
+
+#include "pylith/materials/DruckerPragerPlaneStrain.hh" // USES DruckerPragerPlaneStrain
+
+#include <cstring> // USES memcpy()
+
+// ----------------------------------------------------------------------
+CPPUNIT_TEST_SUITE_REGISTRATION( pylith::materials::TestDruckerPragerPlaneStrain );
+
+// ----------------------------------------------------------------------
+// Setup testing data.
+void
+pylith::materials::TestDruckerPragerPlaneStrain::setUp(void)
+{ // setUp
+  _material = new DruckerPragerPlaneStrain();
+  _matElastic = new DruckerPragerPlaneStrain();
+  _data = new DruckerPragerPlaneStrainElasticData();
+  _dataElastic = new DruckerPragerPlaneStrainElasticData();
+  setupNormalizer();
+} // setUp
+
+// ----------------------------------------------------------------------
+// Test timeStep()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::testTimeStep(void)
+{ // testTimeStep
+  DruckerPragerPlaneStrain material;
+
+  CPPUNIT_ASSERT_EQUAL(false, material._needNewJacobian);
+
+  const PylithScalar dt1 = 1.0;
+  material.timeStep(dt1);
+  CPPUNIT_ASSERT_EQUAL(dt1, material.Material::timeStep());
+  CPPUNIT_ASSERT_EQUAL(true, material.needNewJacobian());
+
+  const PylithScalar dt2 = 2.0;
+  material.timeStep(dt2);
+  CPPUNIT_ASSERT_EQUAL(dt2, material.Material::timeStep());
+  CPPUNIT_ASSERT_EQUAL(true, material.needNewJacobian());
+} // testTimeStep
+
+// ----------------------------------------------------------------------
+// Test useElasticBehavior()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::testUseElasticBehavior(void)
+{ // testUseElasticBehavior
+  DruckerPragerPlaneStrain material;
+
+  material.useElasticBehavior(true);
+  // Some compilers/operating systems (cygwin) don't allow comparing
+  // pointers. Use first test to determine if we can compare pointers.
+  if (&pylith::materials::DruckerPragerPlaneStrain::_calcStressElastic == 
+      material._calcStressFn) {
+    CPPUNIT_ASSERT(
+      &pylith::materials::DruckerPragerPlaneStrain::_calcStressElastic ==
+      material._calcStressFn);
+    CPPUNIT_ASSERT(
+      &pylith::materials::DruckerPragerPlaneStrain::_calcElasticConstsElastic ==
+      material._calcElasticConstsFn);
+    CPPUNIT_ASSERT(
+      &pylith::materials::DruckerPragerPlaneStrain::_updateStateVarsElastic ==
+      material._updateStateVarsFn);
+
+    material.useElasticBehavior(false);
+    CPPUNIT_ASSERT(
+      &pylith::materials::DruckerPragerPlaneStrain::_calcStressElastoplastic ==
+      material._calcStressFn);
+    CPPUNIT_ASSERT(
+      &pylith::materials::DruckerPragerPlaneStrain::_calcElasticConstsElastoplastic ==
+      material._calcElasticConstsFn);
+    CPPUNIT_ASSERT(
+      &pylith::materials::DruckerPragerPlaneStrain::_updateStateVarsElastoplastic ==
+      material._updateStateVarsFn);
+  } // if
+} // testUseElasticBehavior
+
+// ----------------------------------------------------------------------
+// Test usesHasStateVars()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::testHasStateVars(void)
+{ // testHasStateVars
+  DruckerPragerPlaneStrain material;
+  CPPUNIT_ASSERT_EQUAL(true, material.hasStateVars());
+} // testHasStateVars
+
+// ----------------------------------------------------------------------
+// Test _calcStressElastic()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::test_calcStressElastic(void)
+{ // test_calcStressElastic
+  CPPUNIT_ASSERT(0 != _matElastic);
+  _matElastic->useElasticBehavior(true);
+
+  test_calcStress();
+} // test_calcStressElastic
+
+// ----------------------------------------------------------------------
+// Test calcElasticConstsElastic()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::test_calcElasticConstsElastic(void)
+{ // test_calcElasticConstsElastic
+  CPPUNIT_ASSERT(0 != _matElastic);
+  _matElastic->useElasticBehavior(true);
+
+  test_calcElasticConsts();
+} // test_calcElasticConstsElastic
+
+// ----------------------------------------------------------------------
+// Test _updateStateVarsElastic()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::test_updateStateVarsElastic(void)
+{ // test_updateStateVarsElastic
+  CPPUNIT_ASSERT(0 != _matElastic);
+  _matElastic->useElasticBehavior(true);
+
+  test_updateStateVars();
+} // test_updateStateVarsElastic
+
+// ----------------------------------------------------------------------
+// Test _calcStressTimeDep()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::test_calcStressTimeDep(void)
+{ // test_calcStressTimeDep
+  CPPUNIT_ASSERT(0 != _matElastic);
+  _matElastic->useElasticBehavior(false);
+
+  delete _dataElastic; _dataElastic = new DruckerPragerPlaneStrainTimeDepData();
+
+  PylithScalar dt = 2.0e+5;
+  _matElastic->timeStep(dt);
+  test_calcStress();
+} // test_calcStressTimeDep
+
+// ----------------------------------------------------------------------
+// Test _calcElasticConstsTimeDep()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::test_calcElasticConstsTimeDep(void)
+{ // test_calcElasticConstsTimeDep
+  CPPUNIT_ASSERT(0 != _matElastic);
+  _matElastic->useElasticBehavior(false);
+
+  delete _dataElastic; _dataElastic = new DruckerPragerPlaneStrainTimeDepData();
+
+  PylithScalar dt = 2.0e+5;
+  _matElastic->timeStep(dt);
+  test_calcElasticConsts();
+} // test_calcElasticConstsTimeDep
+
+// ----------------------------------------------------------------------
+// Test _updateStateVarsTimeDep()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::test_updateStateVarsTimeDep(void)
+{ // test_updateStateVarsTimeDep
+  CPPUNIT_ASSERT(0 != _matElastic);
+  _matElastic->useElasticBehavior(false);
+
+  delete _dataElastic; _dataElastic = new DruckerPragerPlaneStrainTimeDepData();
+
+  PylithScalar dt = 2.0e+5;
+  _matElastic->timeStep(dt);
+  test_updateStateVars();
+
+} // test_updateStateVarsTimeDep
+
+// ----------------------------------------------------------------------
+// Test _stableTimeStepImplicit()
+void
+pylith::materials::TestDruckerPragerPlaneStrain::test_stableTimeStepImplicit(void)
+{ // test_stableTimeStepImplicit
+  CPPUNIT_ASSERT(0 != _matElastic);
+
+  delete _dataElastic; _dataElastic = new DruckerPragerPlaneStrainTimeDepData();
+
+  TestElasticMaterial::test_stableTimeStepImplicit();
+} // test_stableTimeStepImplicit
+
+// ----------------------------------------------------------------------
+// Test hasProperty().
+void
+pylith::materials::TestDruckerPragerPlaneStrain::testHasProperty(void)
+{ // testHasProperty
+  DruckerPragerPlaneStrain material;
+
+  CPPUNIT_ASSERT(material.hasProperty("mu"));
+  CPPUNIT_ASSERT(material.hasProperty("lambda"));
+  CPPUNIT_ASSERT(material.hasProperty("density"));
+  CPPUNIT_ASSERT(material.hasProperty("alpha_yield"));
+  CPPUNIT_ASSERT(material.hasProperty("beta"));
+  CPPUNIT_ASSERT(material.hasProperty("alpha_flow"));
+  CPPUNIT_ASSERT(!material.hasProperty("aaa"));
+} // testHasProperty
+
+// ----------------------------------------------------------------------
+// Test hasStateVar().
+void
+pylith::materials::TestDruckerPragerPlaneStrain::testHasStateVar(void)
+{ // testHasStateVar
+  DruckerPragerPlaneStrain material;
+
+  CPPUNIT_ASSERT(material.hasStateVar("stress_zz_initial"));
+  CPPUNIT_ASSERT(material.hasStateVar("plastic_strain"));
+} // testHasStateVar
+
+// ----------------------------------------------------------------------
+// Test _dbToProperties().
+void
+pylith::materials::TestDruckerPragerPlaneStrain::testDBToProperties(void)
+{ // testDBToProperties
+  CPPUNIT_ASSERT(0 != _material);
+  
+  TestMaterial::testDBToProperties();
+
+  CPPUNIT_ASSERT_EQUAL(false, _material->isJacobianSymmetric());
+} // testDBToProperties
+
+
+// End of file 

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.hh (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/TestDruckerPragerPlaneStrain.hh)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.hh	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/TestDruckerPragerPlaneStrain.hh	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,126 @@
+// -*- C++ -*-
+//
+// ----------------------------------------------------------------------
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ----------------------------------------------------------------------
+//
+
+/**
+ * @file unittests/libtests/materials/TestDruckerPragerPlaneStrain.hh
+ *
+ * @brief C++ TestDruckerPragerPlaneStrain object
+ *
+ * C++ unit testing for DruckerPragerPlaneStrain.
+ */
+
+#if !defined(pylith_materials_testdruckerpragerplanestrain_hh)
+#define pylith_materials_testdruckerpragerplanestrain_hh
+
+#include "TestElasticMaterial.hh"
+
+/// Namespace for pylith package
+namespace pylith {
+  namespace materials {
+    class TestDruckerPragerPlaneStrain;
+    class DruckerPragerPlaneStrainElasticData;
+    class DruckerPragerPlaneStrainTimeDepData;
+  } // materials
+} // pylith
+
+/// C++ unit testing for DruckerPragerPlaneStrain
+class pylith::materials::TestDruckerPragerPlaneStrain : public TestElasticMaterial
+{ // class TestDruckerPragerPlaneStrain
+
+  // CPPUNIT TEST SUITE /////////////////////////////////////////////////
+  CPPUNIT_TEST_SUITE( TestDruckerPragerPlaneStrain );
+
+  CPPUNIT_TEST( testDimension );
+  CPPUNIT_TEST( testTensorSize );
+  CPPUNIT_TEST( testDBToProperties );
+  CPPUNIT_TEST( testNonDimProperties );
+  CPPUNIT_TEST( testDimProperties );
+  CPPUNIT_TEST( testDBToStateVars );
+  CPPUNIT_TEST( testNonDimStateVars );
+  CPPUNIT_TEST( testDimStateVars );
+  CPPUNIT_TEST( test_calcDensity );
+  CPPUNIT_TEST( test_stableTimeStepImplicit );
+
+  // Need to test Drucker-Prager elastoplastic specific behavior.
+  CPPUNIT_TEST( testTimeStep );
+  CPPUNIT_TEST( testUseElasticBehavior );
+  CPPUNIT_TEST( testHasStateVars );
+
+  CPPUNIT_TEST( test_calcStressElastic );
+  CPPUNIT_TEST( test_calcStressTimeDep );
+  CPPUNIT_TEST( test_calcElasticConstsElastic );
+  CPPUNIT_TEST( test_calcElasticConstsTimeDep );
+  CPPUNIT_TEST( test_updateStateVarsElastic );
+  CPPUNIT_TEST( test_updateStateVarsTimeDep );
+
+  CPPUNIT_TEST( testHasProperty );
+  CPPUNIT_TEST( testHasStateVar );
+
+  CPPUNIT_TEST_SUITE_END();
+
+  // PUBLIC METHODS /////////////////////////////////////////////////////
+public :
+
+  /// Setup testing data.
+  void setUp(void);
+
+  /// Test timeStep()
+  void testTimeStep(void);
+
+  /// Test useElasticBehavior()
+  void testUseElasticBehavior(void);
+
+  /// Test hasStateVars()
+  void testHasStateVars(void);
+
+  /// Test _calcStressElastic()
+  void test_calcStressElastic(void);
+
+  /// Test _calcElasticConstsElastic()
+  void test_calcElasticConstsElastic(void);
+
+  /// Test _updateStateVarsElastic()
+  void test_updateStateVarsElastic(void);
+
+  /// Test _calcStressTimeDep()
+  void test_calcStressTimeDep(void);
+
+  /// Test _calcElasticConstsTimeDep()
+  void test_calcElasticConstsTimeDep(void);
+
+  /// Test _updateStatevarsTimeDep()
+  void test_updateStateVarsTimeDep(void);
+
+  /// Test _stableTimeStepImplicit()
+  void test_stableTimeStepImplicit(void);
+
+  /// Test hasProperty()
+  void testHasProperty(void);
+
+  /// Test hasStateVar()
+  void testHasStateVar(void);
+
+  /// Test _dbToProperties() and check flag for symmetry of Jacobian.
+  void testDBToProperties(void);
+
+}; // class TestDruckerPragerPlaneStrain
+
+#endif // pylith_materials_testdruckerpragerplanestrain_hh
+
+
+// End of file 

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElastic.py (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/data/DruckerPragerPlaneStrainElastic.py)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElastic.py	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElastic.py	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,228 @@
+#!/usr/bin/env python
+#
+# ----------------------------------------------------------------------
+#
+# Brad T. Aagaard, U.S. Geological Survey
+# Charles A. Williams, GNS Science
+# Matthew G. Knepley, University of Chicago
+#
+# This code was developed as part of the Computational Infrastructure
+# for Geodynamics (http://geodynamics.org).
+#
+# Copyright (c) 2010-2011 University of California, Davis
+#
+# See COPYING for license information.
+#
+# ----------------------------------------------------------------------
+#
+
+## @file unittests/libtests/materials/data/DruckerPragerPlaneStrainElastic.py
+
+## @brief Python application for generating C++ data files for testing
+## C++ DruckerPragerPlaneStrain object with elastic behavior.
+
+from ElasticMaterialApp import ElasticMaterialApp
+
+import numpy
+import math
+
+# ----------------------------------------------------------------------
+dimension = 2
+numElasticConsts = 9
+tensorSize = 3
+
+# DruckerPragerPlaneStrainElastic class
+class DruckerPragerPlaneStrainElastic(ElasticMaterialApp):
+  """
+  Python application for generating C++ data files for testing C++
+  DruckerPragerPlaneStrain object with elastic behavior.
+  """
+  
+  # PUBLIC METHODS /////////////////////////////////////////////////////
+  
+  def __init__(self, name="druckerpragerplanestrainelastic"):
+    """
+    Constructor.
+    """
+    ElasticMaterialApp.__init__(self, name)
+
+    # import pdb
+    # pdb.set_trace()
+    numLocs = 2
+
+    self.dimension = dimension
+    self.numLocs = numLocs
+
+    self.dbPropertyValues = ["density", "vs", "vp",
+                             "friction-angle", "cohesion",
+                             "dilatation-angle"]
+    self.numPropertyValues = numpy.array([1, 1, 1, 1, 1, 1], dtype=numpy.int32)
+
+    self.dbStateVarValues = ["stress-zz-initial",
+                             "plastic-strain-xx",
+                             "plastic-strain-yy",
+                             "plastic-strain-zz",
+                             "plastic-strain-xy"
+                             ]
+    self.numStateVarValues = numpy.array([1, 4], dtype=numpy.int32)
+
+    densityA = 2500.0
+    vsA = 3000.0
+    vpA = vsA*3**0.5
+    # First case has different values for friction angle and dilatation angle.
+    frictionAngleA = math.radians(30.0)
+    dilatationAngleA = math.radians(20.0)
+    cohesionA = 3.0e5
+    strainA = [1.1e-4, 1.2e-4, 1.4e-4]
+    initialStressA = [2.1e4, 2.2e4, 2.4e4]
+    initialStrainA = [3.1e-4, 3.2e-4, 3.4e-4]
+    muA = vsA*vsA*densityA
+    lambdaA = vpA*vpA*densityA - 2.0*muA
+    stressZZInitialA = numpy.array([1.075e4], dtype=numpy.float64)
+
+    denomFrictionA = math.sqrt(3.0) * (3.0 - math.sin(frictionAngleA))
+    denomDilatationA = math.sqrt(3.0) * (3.0 - math.sin(dilatationAngleA))
+    alphaYieldA = 2.0 * math.sin(frictionAngleA)/denomFrictionA
+    betaA = 6.0 * cohesionA * math.cos(frictionAngleA)/denomFrictionA
+    alphaFlowA = 2.0 * math.sin(dilatationAngleA)/denomDilatationA
+    
+    densityB = 2000.0
+    vsB = 1200.0
+    vpB = vsB*3**0.5
+    # Second case has same values for friction angle and dilatation angle.
+    frictionAngleB = math.radians(25.0)
+    dilatationAngleB = math.radians(25.0)
+    cohesionB = 1.0e5
+    strainB = [4.1e-4, 4.2e-4, 4.4e-4]
+    initialStressB = [5.1e4, 5.2e4, 5.4e4]
+    initialStrainB = [6.1e-4, 6.2e-4, 6.4e-4]
+    muB = vsB*vsB*densityB
+    lambdaB = vpB*vpB*densityB - 2.0*muB
+    denomFrictionB = math.sqrt(3.0) * (3.0 - math.sin(frictionAngleB))
+    denomDilatationB = math.sqrt(3.0) * (3.0 - math.sin(dilatationAngleB))
+    alphaYieldB = 2.0 * math.sin(frictionAngleB)/denomFrictionB
+    betaB = 6.0 * cohesionB * math.cos(frictionAngleB)/denomFrictionB
+    alphaFlowB = 2.0 * math.sin(dilatationAngleB)/denomDilatationB
+    stressZZInitialB = numpy.array([2.575e4], dtype=numpy.float64)
+
+    self.lengthScale = 1.0e+3
+    self.pressureScale = muA
+    self.densityScale = 1.0e+3
+    self.timeScale = 1.0
+
+    self.dbProperties = numpy.array([ [densityA, vsA, vpA, \
+                                       frictionAngleA, cohesionA, \
+                                       dilatationAngleA],
+                                      [densityB, vsB, vpB, \
+                                       frictionAngleB, cohesionB, \
+                                       dilatationAngleB] ], 
+                                    dtype=numpy.float64)
+    self.properties = numpy.array([ [densityA, muA, lambdaA, \
+                                     alphaYieldA, betaA, \
+                                     alphaFlowA],
+                                    [densityB, muB, lambdaB, \
+                                     alphaYieldB, betaB, \
+                                     alphaFlowB] ],
+                                     dtype=numpy.float64)
+
+    # TEMPORARY, need to determine how to use initial state variables
+    self.dbStateVars = numpy.zeros( (numLocs, 1 + 4), dtype=numpy.float64)
+    self.dbStateVars[0, 0] = stressZZInitialA
+    self.dbStateVars[1, 0] = stressZZInitialB
+
+    self.stateVars = numpy.zeros( (numLocs, 1 + 4), dtype=numpy.float64)
+    self.stateVars[0, 0] = stressZZInitialA
+    self.stateVars[1, 0] = stressZZInitialB
+
+    mu0 = self.pressureScale
+    density0 = self.densityScale
+    self.propertiesNondim = \
+        numpy.array([ [densityA/density0, muA/mu0, lambdaA/mu0, \
+                       alphaYieldA, betaA/mu0, \
+                       alphaFlowA],
+                      [densityB/density0, muB/mu0, lambdaB/mu0, \
+                       alphaYieldB, betaB/mu0, \
+                       alphaFlowB] ],
+                    dtype=numpy.float64)
+
+    stressZZInitialANondim = stressZZInitialA/mu0
+    stressZZInitialBNondim = stressZZInitialB/mu0
+
+    self.stateVarsNondim = numpy.zeros( (numLocs, 1 + 4), dtype=numpy.float64)
+    self.stateVarsNondim[0, 0] = stressZZInitialANondim
+    self.stateVarsNondim[1, 0] = stressZZInitialBNondim
+    
+    self.initialStress = numpy.array([initialStressA,
+                                      initialStressB],
+                                    dtype=numpy.float64)
+    self.initialStrain = numpy.array([initialStrainA,
+                                      initialStrainB],
+                                    dtype=numpy.float64)
+    
+    self.density = numpy.array([densityA,
+                                densityB],
+                               dtype=numpy.float64)
+
+    self.strain = numpy.array([strainA,
+                               strainB],
+                               dtype=numpy.float64)
+    
+    self.stress = numpy.zeros( (numLocs, tensorSize), dtype=numpy.float64)
+    self.elasticConsts = numpy.zeros( (self.numLocs, numElasticConsts), \
+                                        dtype=numpy.float64)
+
+    (self.elasticConsts[0,:], self.stress[0,:]) = \
+        self._calcStress(strainA, muA, lambdaA, \
+                           initialStressA, initialStrainA)
+    (self.elasticConsts[1,:], self.stress[1,:]) = \
+        self._calcStress(strainB, muB, lambdaB, \
+                           initialStressB, initialStrainB)
+
+    self.dtStableImplicit = 1.0e10
+
+    stateVarsUpdatedA = numpy.array([stressZZInitialA, 0.0, 0.0, 0.0, 0.0],
+                                    dtype=numpy.float64)
+    stateVarsUpdatedB = numpy.array([stressZZInitialB, 0.0, 0.0, 0.0, 0.0],
+                                    dtype=numpy.float64)
+
+    self.stateVarsUpdated = numpy.array( [stateVarsUpdatedA, stateVarsUpdatedB],
+                                         dtype=numpy.float64)
+
+    return
+
+
+  def _calcStress(self, strainV, muV, lambdaV, initialStressV, initialStrainV):
+    """
+    Compute stress and derivative of elasticity matrix.
+    """
+    C1111 = lambdaV + 2.0*muV
+    C1122 = lambdaV
+    C1112 = 0.0
+    C2211 = lambdaV
+    C2222 = lambdaV + 2.0*muV
+    C2212 = 0.0
+    C1211 = 0.0
+    C1222 = 0.0
+    C1212 = 2.0*muV
+    elasticConsts = numpy.array([C1111, C1122, C1112,
+                                 C2211, C2222, C2212,
+                                 C1211, C1222, C1212], dtype=numpy.float64)
+
+    strain = numpy.reshape(strainV, (tensorSize,1))
+    initialStress = numpy.reshape(initialStressV, (tensorSize,1))
+    initialStrain = numpy.reshape(initialStrainV, (tensorSize,1))
+    elastic = numpy.array([ [C1111, C1122, C1112],
+                            [C2211, C2222, C2212],
+                            [C1211, C1222, C1212] ], dtype=numpy.float64)
+    stress = numpy.dot(elastic, strain-initialStrain) + initialStress
+    return (elasticConsts, numpy.ravel(stress))
+  
+
+# MAIN /////////////////////////////////////////////////////////////////
+if __name__ == "__main__":
+
+  app = DruckerPragerPlaneStrainElastic()
+  app.run()
+
+
+# End of file 

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.cc (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.cc)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.cc	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.cc	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,278 @@
+// -*- C++ -*-
+//
+// ======================================================================
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ======================================================================
+//
+
+// DO NOT EDIT THIS FILE
+// This file was generated from python application druckerpragerplanestrainelastic.
+
+#include "DruckerPragerPlaneStrainElasticData.hh"
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_dimension = 2;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numLocs = 2;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numProperties = 6;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numStateVars = 2;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numDBProperties = 6;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numDBStateVars = 5;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numPropsQuadPt = 6;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numVarsQuadPt = 5;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_lengthScale =   1.00000000e+03;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_timeScale =   1.00000000e+00;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_pressureScale =   2.25000000e+10;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_densityScale =   1.00000000e+03;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_dtStableImplicit =   1.00000000e+10;
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numPropertyValues[] = {
+1,
+1,
+1,
+1,
+1,
+1,
+};
+
+const int pylith::materials::DruckerPragerPlaneStrainElasticData::_numStateVarValues[] = {
+1,
+4,
+};
+
+const char* pylith::materials::DruckerPragerPlaneStrainElasticData::_dbPropertyValues[] = {
+"density",
+"vs",
+"vp",
+"friction-angle",
+"cohesion",
+"dilatation-angle",
+};
+
+const char* pylith::materials::DruckerPragerPlaneStrainElasticData::_dbStateVarValues[] = {
+"stress-zz-initial",
+"plastic-strain-xx",
+"plastic-strain-yy",
+"plastic-strain-zz",
+"plastic-strain-xy",
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_dbProperties[] = {
+  2.50000000e+03,
+  3.00000000e+03,
+  5.19615242e+03,
+  5.23598776e-01,
+  3.00000000e+05,
+  3.49065850e-01,
+  2.00000000e+03,
+  1.20000000e+03,
+  2.07846097e+03,
+  4.36332313e-01,
+  1.00000000e+05,
+  4.36332313e-01,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_dbStateVars[] = {
+  1.07500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  2.57500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_properties[] = {
+  2.50000000e+03,
+  2.25000000e+10,
+  2.25000000e+10,
+  2.30940108e-01,
+  3.60000000e+05,
+  1.48583084e-01,
+  2.00000000e+03,
+  2.88000000e+09,
+  2.88000000e+09,
+  1.89338478e-01,
+  1.21811303e+05,
+  1.89338478e-01,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_stateVars[] = {
+  1.07500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  2.57500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_propertiesNondim[] = {
+  2.50000000e+00,
+  1.00000000e+00,
+  1.00000000e+00,
+  2.30940108e-01,
+  1.60000000e-05,
+  1.48583084e-01,
+  2.00000000e+00,
+  1.28000000e-01,
+  1.28000000e-01,
+  1.89338478e-01,
+  5.41383567e-06,
+  1.89338478e-01,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_stateVarsNondim[] = {
+  4.77777778e-07,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  1.14444444e-06,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_density[] = {
+  2.50000000e+03,
+  2.00000000e+03,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_strain[] = {
+  1.10000000e-04,
+  1.20000000e-04,
+  1.40000000e-04,
+  4.10000000e-04,
+  4.20000000e-04,
+  4.40000000e-04,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_stress[] = {
+ -1.79790000e+07,
+ -1.79780000e+07,
+ -8.97600000e+06,
+ -2.25300000e+06,
+ -2.25200000e+06,
+ -1.09800000e+06,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_elasticConsts[] = {
+  6.75000000e+10,
+  2.25000000e+10,
+  0.00000000e+00,
+  2.25000000e+10,
+  6.75000000e+10,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  4.50000000e+10,
+  8.64000000e+09,
+  2.88000000e+09,
+  0.00000000e+00,
+  2.88000000e+09,
+  8.64000000e+09,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  5.76000000e+09,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_initialStress[] = {
+  2.10000000e+04,
+  2.20000000e+04,
+  2.40000000e+04,
+  5.10000000e+04,
+  5.20000000e+04,
+  5.40000000e+04,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_initialStrain[] = {
+  3.10000000e-04,
+  3.20000000e-04,
+  3.40000000e-04,
+  6.10000000e-04,
+  6.20000000e-04,
+  6.40000000e-04,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainElasticData::_stateVarsUpdated[] = {
+  1.07500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  2.57500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+};
+
+pylith::materials::DruckerPragerPlaneStrainElasticData::DruckerPragerPlaneStrainElasticData(void)
+{ // constructor
+  dimension = _dimension;
+  numLocs = _numLocs;
+  numProperties = _numProperties;
+  numStateVars = _numStateVars;
+  numDBProperties = _numDBProperties;
+  numDBStateVars = _numDBStateVars;
+  numPropsQuadPt = _numPropsQuadPt;
+  numVarsQuadPt = _numVarsQuadPt;
+  lengthScale = _lengthScale;
+  timeScale = _timeScale;
+  pressureScale = _pressureScale;
+  densityScale = _densityScale;
+  dtStableImplicit = _dtStableImplicit;
+  numPropertyValues = const_cast<int*>(_numPropertyValues);
+  numStateVarValues = const_cast<int*>(_numStateVarValues);
+  dbPropertyValues = const_cast<char**>(_dbPropertyValues);
+  dbStateVarValues = const_cast<char**>(_dbStateVarValues);
+  dbProperties = const_cast<PylithScalar*>(_dbProperties);
+  dbStateVars = const_cast<PylithScalar*>(_dbStateVars);
+  properties = const_cast<PylithScalar*>(_properties);
+  stateVars = const_cast<PylithScalar*>(_stateVars);
+  propertiesNondim = const_cast<PylithScalar*>(_propertiesNondim);
+  stateVarsNondim = const_cast<PylithScalar*>(_stateVarsNondim);
+  density = const_cast<PylithScalar*>(_density);
+  strain = const_cast<PylithScalar*>(_strain);
+  stress = const_cast<PylithScalar*>(_stress);
+  elasticConsts = const_cast<PylithScalar*>(_elasticConsts);
+  initialStress = const_cast<PylithScalar*>(_initialStress);
+  initialStrain = const_cast<PylithScalar*>(_initialStrain);
+  stateVarsUpdated = const_cast<PylithScalar*>(_stateVarsUpdated);
+} // constructor
+
+pylith::materials::DruckerPragerPlaneStrainElasticData::~DruckerPragerPlaneStrainElasticData(void)
+{}
+
+
+// End of file

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.hh (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.hh)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.hh	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainElasticData.hh	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,110 @@
+// -*- C++ -*-
+//
+// ======================================================================
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ======================================================================
+//
+
+// DO NOT EDIT THIS FILE
+// This file was generated from python application druckerpragerplanestrainelastic.
+
+#if !defined(pylith_materials_druckerpragerplanestrainelasticdata_hh)
+#define pylith_materials_druckerpragerplanestrainelasticdata_hh
+
+#include "ElasticMaterialData.hh"
+
+namespace pylith {
+  namespace materials {
+     class DruckerPragerPlaneStrainElasticData;
+  } // pylith
+} // materials
+
+class pylith::materials::DruckerPragerPlaneStrainElasticData : public ElasticMaterialData
+{
+
+public: 
+
+  /// Constructor
+  DruckerPragerPlaneStrainElasticData(void);
+
+  /// Destructor
+  ~DruckerPragerPlaneStrainElasticData(void);
+
+private:
+
+  static const int _dimension;
+
+  static const int _numLocs;
+
+  static const int _numProperties;
+
+  static const int _numStateVars;
+
+  static const int _numDBProperties;
+
+  static const int _numDBStateVars;
+
+  static const int _numPropsQuadPt;
+
+  static const int _numVarsQuadPt;
+
+  static const PylithScalar _lengthScale;
+
+  static const PylithScalar _timeScale;
+
+  static const PylithScalar _pressureScale;
+
+  static const PylithScalar _densityScale;
+
+  static const PylithScalar _dtStableImplicit;
+
+  static const int _numPropertyValues[];
+
+  static const int _numStateVarValues[];
+
+  static const char* _dbPropertyValues[];
+
+  static const char* _dbStateVarValues[];
+
+  static const PylithScalar _dbProperties[];
+
+  static const PylithScalar _dbStateVars[];
+
+  static const PylithScalar _properties[];
+
+  static const PylithScalar _stateVars[];
+
+  static const PylithScalar _propertiesNondim[];
+
+  static const PylithScalar _stateVarsNondim[];
+
+  static const PylithScalar _density[];
+
+  static const PylithScalar _strain[];
+
+  static const PylithScalar _stress[];
+
+  static const PylithScalar _elasticConsts[];
+
+  static const PylithScalar _initialStress[];
+
+  static const PylithScalar _initialStrain[];
+
+  static const PylithScalar _stateVarsUpdated[];
+
+};
+
+#endif // pylith_materials_druckerpragerplanestrainelasticdata_hh
+
+// End of file

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDep.py (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDep.py)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDep.py	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDep.py	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,378 @@
+#!/usr/bin/env python
+#
+# ----------------------------------------------------------------------
+#
+# Brad T. Aagaard, U.S. Geological Survey
+# Charles A. Williams, GNS Science
+# Matthew G. Knepley, University of Chicago
+#
+# This code was developed as part of the Computational Infrastructure
+# for Geodynamics (http://geodynamics.org).
+#
+# Copyright (c) 2010-2011 University of California, Davis
+#
+# See COPYING for license information.
+#
+# ----------------------------------------------------------------------
+#
+
+## @file unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDep.py
+
+## @brief Python application for generating C++ data files for testing
+## C++ DruckerPragerPlaneStrain object with time dependent behavior.
+
+from ElasticMaterialApp import ElasticMaterialApp
+
+import numpy
+import math
+
+# ----------------------------------------------------------------------
+dimension = 2
+numElasticConsts = 9
+tensorSize = 3
+
+# DruckerPragerPlaneStrainTimeDep class
+class DruckerPragerPlaneStrainTimeDep(ElasticMaterialApp):
+  """
+  Python application for generating C++ data files for testing C++
+  DruckerPragerPlaneStrain object with time dependent behavior.
+  """
+  
+  # PUBLIC METHODS /////////////////////////////////////////////////////
+  
+  def __init__(self, name="druckerpragerplanestraintimedep"):
+    """
+    Constructor.
+    """
+    ElasticMaterialApp.__init__(self, name)
+
+    # import pdb
+    # pdb.set_trace()
+    numLocs = 2
+
+    self.dimension = dimension
+    self.numLocs = numLocs
+
+    self.dbPropertyValues = ["density", "vs", "vp",
+                             "friction-angle", "cohesion",
+                             "dilatation-angle"]
+    self.propertyValues = ["density", "mu", "lambda",
+                           "alpha_yield", "beta", "alpha_flow"]
+    self.numPropertyValues = numpy.array([1, 1, 1, 1, 1, 1], dtype=numpy.int32)
+
+    self.dbStateVarValues = ["stress-zz-initial",
+                             "plastic-strain-xx",
+                             "plastic-strain-yy",
+                             "plastic-strain-zz",
+                             "plastic-strain-xy"
+                             ]
+    self.numStateVarValues = numpy.array([1, 4], dtype=numpy.int32)
+
+    self.dt = 2.0e5
+
+    densityA = 2500.0
+    vsA = 3000.0
+    vpA = vsA*3**0.5
+    # First case has same values for friction angle and dilatation angle.
+    frictionAngleA = math.radians(30.0)
+    dilatationAngleA = math.radians(20.0)
+    cohesionA = 3.0e5
+    strainA = [1.1e-4, 1.2e-4, 1.4e-4]
+    initialStressA = [2.1e4, 2.2e4, 2.4e4]
+    initialStrainA = [3.6e-5, 3.5e-5, 3.3e-5]
+    muA = vsA*vsA*densityA
+    lambdaA = vpA*vpA*densityA - 2.0*muA
+    stressZZInitialA = 1.075e4
+
+    denomFrictionA = math.sqrt(3.0) * (3.0 - math.sin(frictionAngleA))
+    denomDilatationA = math.sqrt(3.0) * (3.0 - math.sin(dilatationAngleA))
+    alphaYieldA = 2.0 * math.sin(frictionAngleA)/denomFrictionA
+    betaA = 6.0 * cohesionA * math.cos(frictionAngleA)/denomFrictionA
+    alphaFlowA = 2.0 * math.sin(dilatationAngleA)/denomDilatationA
+    
+    densityB = 2000.0
+    vsB = 1200.0
+    vpB = vsB*3**0.5
+    # Second case has different values for friction angle and dilatation angle.
+    frictionAngleB = math.radians(25.0)
+    dilatationAngleB = math.radians(25.0)
+    cohesionB = 1.0e4
+    strainB = [4.1e-4, 4.2e-4, 4.4e-4]
+    initialStressB = [5.1e4, 5.2e4, 5.4e4]
+    initialStrainB = [6.1e-5, 6.2e-5, 6.6e-5]
+    muB = vsB*vsB*densityB
+    lambdaB = vpB*vpB*densityB - 2.0*muB
+    stressZZInitialB = 2.575e4
+
+    denomFrictionB = math.sqrt(3.0) * (3.0 - math.sin(frictionAngleB))
+    denomDilatationB = math.sqrt(3.0) * (3.0 - math.sin(dilatationAngleB))
+    alphaYieldB = 2.0 * math.sin(frictionAngleB)/denomFrictionB
+    betaB = 6.0 * cohesionB * math.cos(frictionAngleB)/denomFrictionB
+    alphaFlowB = 2.0 * math.sin(dilatationAngleB)/denomDilatationB
+
+    self.lengthScale = 1.0e+3
+    self.pressureScale = muA
+    self.densityScale = 1.0e+3
+    self.timeScale = 1.0
+
+    self.dbProperties = numpy.array([ [densityA, vsA, vpA, \
+                                       frictionAngleA, cohesionA, \
+                                       dilatationAngleA],
+                                      [densityB, vsB, vpB, \
+                                       frictionAngleB, cohesionB, \
+                                       dilatationAngleB] ], 
+                                    dtype=numpy.float64)
+    self.properties = numpy.array([ [densityA, muA, lambdaA, \
+                                     alphaYieldA, betaA, \
+                                     alphaFlowA],
+                                    [densityB, muB, lambdaB, \
+                                     alphaYieldB, betaB, \
+                                     alphaFlowB] ],
+                                  dtype=numpy.float64)
+
+    # TEMPORARY, need to determine how to use initial state variables
+    self.dbStateVars = numpy.zeros( (numLocs, 1 + 4), dtype=numpy.float64)
+    self.dbStateVars[0, 0] = stressZZInitialA
+    self.dbStateVars[1, 0] = stressZZInitialB
+
+    stateVarsA = [stressZZInitialA, 4.1e-5, 4.2e-5, 4.4e-5, 4.5e-5]
+    stateVarsB = [stressZZInitialB, 1.1e-5, 1.2e-5, 1.4e-5, 1.5e-5]
+    plasStrainA = stateVarsA[1:]
+    plasStrainB = stateVarsB[1:]
+    self.stateVars = numpy.array([[stateVarsA], [stateVarsB] ],
+                                 dtype=numpy.float64)
+
+    mu0 = self.pressureScale
+    density0 = self.densityScale
+    self.propertiesNondim = \
+        numpy.array([ [densityA/density0, muA/mu0, lambdaA/mu0, \
+                       alphaYieldA, betaA/mu0, \
+                       alphaFlowA],
+                      [densityB/density0, muB/mu0, lambdaB/mu0, \
+                       alphaYieldB, betaB/mu0, \
+                       alphaFlowB] ],
+                    dtype=numpy.float64)
+
+    stressZZInitialANondim = stressZZInitialA/mu0
+    stressZZInitialBNondim = stressZZInitialB/mu0
+    self.stateVarsNondim = numpy.array([[stateVarsA], [stateVarsB] ],
+                                       dtype=numpy.float64)
+    self.stateVarsNondim[0, 0] = stressZZInitialANondim
+    self.stateVarsNondim[1, 0] = stressZZInitialBNondim
+
+    self.initialStress = numpy.array([initialStressA,
+                                      initialStressB],
+                                    dtype=numpy.float64)
+    self.initialStrain = numpy.array([initialStrainA,
+                                      initialStrainB],
+                                    dtype=numpy.float64)
+    
+    self.density = numpy.array([densityA,
+                                densityB],
+                               dtype=numpy.float64)
+
+    self.strain = numpy.array([strainA,
+                               strainB],
+                               dtype=numpy.float64)
+    
+    self.stress = numpy.zeros( (numLocs, tensorSize), dtype=numpy.float64)
+    self.stateVarsUpdated = numpy.zeros( (numLocs, 5),
+                                         dtype=numpy.float64)
+    self.elasticConsts = numpy.zeros( (self.numLocs, numElasticConsts), \
+                                        dtype=numpy.float64)
+
+    (self.elasticConsts[0,:], self.stress[0,:], self.stateVarsUpdated[0,:]) = \
+                              self._calcStress(strainA, muA, lambdaA,
+                                               alphaYieldA, betaA, alphaFlowA,
+                                               plasStrainA,
+                                               initialStressA, initialStrainA,
+                                               stateVarsA)
+    (self.elasticConsts[1,:], self.stress[1,:], self.stateVarsUpdated[1,:]) = \
+                              self._calcStress(strainB, muB, lambdaB,
+                                               alphaYieldB, betaB, alphaFlowB,
+                                               plasStrainB,
+                                               initialStressB, initialStrainB,
+                                               stateVarsB)
+
+    self.dtStableImplicit = 1.0e30
+
+    return
+
+
+  def _scalarProduct(self, tensor1, tensor2):
+    """
+    Compute the scalar product of two tensors stored in vector form (length 4).
+    """
+    scalarProduct = tensor1[0] * tensor2[0] + \
+                    tensor1[1] * tensor2[1] + \
+                    tensor1[2] * tensor2[2] + \
+                    2.0 * tensor1[3] * tensor2[3]
+    return scalarProduct
+
+
+  def _calcStressComponent(self, strainVal, strainComp, stressComp, strainTpdt,
+                           muV, lambdaV, alphaYieldV, betaV, alphaFlowV,
+                           plasStrainT, initialStress, initialStrain,
+                           stateVars):
+    """
+    Function to compute a particular stress component as a function of a
+    strain component.
+    """
+    strainTest = numpy.array(strainTpdt, dtype=numpy.float64)
+    strainTest[strainComp] = strainVal
+    stressTpdt, visStrainTpdt = self._computeStress(strainTest, muV, lambdaV,
+                                                    alphaYieldV, betaV,
+                                                    alphaFlowV,
+                                                    plasStrainT,
+                                                    initialStress,
+                                                    initialStrain,
+                                                    stateVars)
+    return stressTpdt[stressComp]
+
+
+  def _computeStress(self, strainTpdt, muV, lambdaV, alphaYieldV, betaV,
+                     alphaFlowV, plasStrainT, initialStress, initialStrain,
+                     stateVars):
+    """
+    Function to compute stresses and plastic strains.
+    """
+    
+    # Constants
+    mu2 = 2.0 * muV
+    lamPlusMu = lambdaV + muV
+    bulkModulus = lambdaV + mu2/3.0
+    ae = 1.0/mu2
+    am = 1.0/(3.0 * bulkModulus)
+    diag = numpy.array([1.0, 1.0, 1.0, 0.0], dtype=numpy.float64)
+
+    # Values from previous time step
+    meanPlasStrainT = (plasStrainT[0] + plasStrainT[1] + plasStrainT[2])/3.0
+    devPlasStrainT = plasStrainT - meanPlasStrainT * diag
+    
+    # Initial stress values
+    initialStress4 = numpy.array([initialStress[0], initialStress[1],
+                                 stateVars[0], initialStress[2]],
+                                dtype=numpy.float64)
+    meanStressInitial = (initialStress[0] + initialStress[1] + stateVars[0])/3.0
+    devStressInitial = initialStress4 - meanStressInitial * diag
+    
+    # Initial strain values
+    initialStrain4 = numpy.array([initialStrain[0], initialStrain[1],
+                                 0.0, initialStrain[2]], dtype=numpy.float64)
+    meanStrainInitial = (initialStrain[0] + initialStrain[1])/3.0
+    devStrainInitial = initialStrain4 - meanStrainInitial * diag
+
+    # Values for current time step
+    strainTpdt4 = numpy.array([strainTpdt[0], strainTpdt[1],
+                                 0.0, strainTpdt[2]], dtype=numpy.float64)
+    meanStrainTpdt = (strainTpdt[0] + strainTpdt[1])/3.0
+    meanStrainPPTpdt = meanStrainTpdt - meanPlasStrainT - meanStrainInitial
+    strainPPTpdt = strainTpdt4 - meanStrainTpdt * diag - \
+                   devPlasStrainT - devStrainInitial
+
+    # Compute trial elastic stresses and yield function to see if yield should
+    # occur.
+    trialDevStress = strainPPTpdt/ae + devStressInitial
+    trialMeanStress = meanStrainPPTpdt/am + meanStressInitial
+    yieldFunction = 3.0 * alphaYieldV * trialMeanStress + \
+                    math.sqrt(0.5 * self._scalarProduct(trialDevStress,
+                                                        trialDevStress)) - \
+                                                        betaV
+
+    # If yield function is greater than zero, compute elastoplastic stress.
+    if (yieldFunction >= 0.0):
+      devStressInitialProd = self._scalarProduct(devStressInitial,
+                                                 devStressInitial)
+      strainPPTpdtProd = self._scalarProduct(strainPPTpdt, strainPPTpdt)
+      d = math.sqrt(ae * ae * devStressInitialProd + \
+                    2.0 * ae * self._scalarProduct(devStressInitial, \
+                                                   strainPPTpdt) + \
+                    strainPPTpdtProd)
+      plasticMult = 2.0 * ae * am * \
+                    (3.0 * alphaYieldV * meanStrainPPTpdt/am + \
+                     d/(math.sqrt(2.0) * ae) - betaV)/ \
+                     (6.0 * alphaYieldV * alphaFlowV * ae + am)
+      deltaMeanPlasticStrain = plasticMult * alphaFlowV
+      meanStressTpdt = (meanStrainPPTpdt - deltaMeanPlasticStrain)/am + \
+                       meanStressInitial
+
+      deltaDevPlasticStrain = 0.0
+      stressTpdt4 = numpy.zeros( (4), dtype=numpy.float64)
+      stressTpdt = numpy.zeros( (tensorSize), dtype=numpy.float64)
+      plasStrainTpdt = numpy.zeros( (4), dtype=numpy.float64)
+
+      for iComp in range(4):
+        deltaDevPlasticStrain = plasticMult * (strainPPTpdt[iComp] + \
+                                               ae * devStressInitial[iComp])/ \
+                                               (math.sqrt(2.0) * d)
+        devStressTpdt = (strainPPTpdt[iComp] - deltaDevPlasticStrain)/ae + \
+                        devStressInitial[iComp]
+        stressTpdt4[iComp] = devStressTpdt + diag[iComp] * meanStressTpdt
+        plasStrainTpdt[iComp] = plasStrainT[iComp] + deltaDevPlasticStrain + \
+                                diag[iComp] * deltaMeanPlasticStrain
+      
+      stressTpdt[0] = stressTpdt4[0]
+      stressTpdt[1] = stressTpdt4[1]
+      stressTpdt[2] = stressTpdt4[3]
+
+    return stressTpdt, plasStrainTpdt
+
+
+  def _calcStress(self, strainV, muV, lambdaV, alphaYieldV, betaV, alphaFlowV,
+                  plasStrainV, initialStressV, initialStrainV, stateVars):
+    """
+    Compute stress, updated state variables and derivative of elasticity matrix.
+    """
+    import scipy.misc
+
+    # Define some numpy arrays
+    strainTpdt = numpy.array(strainV, dtype=numpy.float64)
+    plasStrainT = numpy.array(plasStrainV, dtype=numpy.float64)
+    initialStress = numpy.array(initialStressV, dtype=numpy.float64)
+    initialStrain = numpy.array(initialStrainV, dtype=numpy.float64)
+    stressTpdt, plasStrainTpdt = self._computeStress(strainTpdt, muV, lambdaV,
+                                                     alphaYieldV, betaV,
+                                                     alphaFlowV, plasStrainT,
+                                                     initialStress,
+                                                     initialStrain,
+                                                     stateVars)
+    stateVarsUpdated = numpy.array( (stateVars[0], plasStrainTpdt[0],
+                                     plasStrainTpdt[1], plasStrainTpdt[2],
+                                     plasStrainTpdt[3]))
+    # Compute components of tangent constitutive matrix using numerical
+    # derivatives.
+    derivDx = 1.0e-12
+    derivOrder = 3
+    elasticConstsList = []
+
+    for stressComp in range(tensorSize):
+      for strainComp in range(tensorSize):
+        dStressDStrain = scipy.misc.derivative(self._calcStressComponent,
+                                               strainTpdt[strainComp],
+                                               dx=derivDx,
+                                               args=(strainComp,
+                                                     stressComp,
+                                                     strainTpdt, muV, lambdaV,
+                                                     alphaYieldV, betaV,
+                                                     alphaFlowV,
+                                                     plasStrainT,
+                                                     initialStress,
+                                                     initialStrain,
+                                                     stateVars),
+                                               order=derivOrder)
+        elasticConstsList.append(dStressDStrain)
+
+    elasticConsts = numpy.array(elasticConstsList, dtype=numpy.float64)
+
+    return (elasticConsts, numpy.ravel(stressTpdt),
+            numpy.ravel(stateVarsUpdated))
+ 
+
+# MAIN /////////////////////////////////////////////////////////////////
+if __name__ == "__main__":
+
+  app = DruckerPragerPlaneStrainTimeDep()
+  app.run()
+
+
+# End of file 

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.cc (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.cc)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.cc	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.cc	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,278 @@
+// -*- C++ -*-
+//
+// ======================================================================
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ======================================================================
+//
+
+// DO NOT EDIT THIS FILE
+// This file was generated from python application druckerpragerplanestraintimedep.
+
+#include "DruckerPragerPlaneStrainTimeDepData.hh"
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_dimension = 2;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numLocs = 2;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numProperties = 6;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numStateVars = 2;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numDBProperties = 6;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numDBStateVars = 5;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numPropsQuadPt = 6;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numVarsQuadPt = 5;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_lengthScale =   1.00000000e+03;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_timeScale =   1.00000000e+00;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_pressureScale =   2.25000000e+10;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_densityScale =   1.00000000e+03;
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_dtStableImplicit =   1.00000000e+30;
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numPropertyValues[] = {
+1,
+1,
+1,
+1,
+1,
+1,
+};
+
+const int pylith::materials::DruckerPragerPlaneStrainTimeDepData::_numStateVarValues[] = {
+1,
+4,
+};
+
+const char* pylith::materials::DruckerPragerPlaneStrainTimeDepData::_dbPropertyValues[] = {
+"density",
+"vs",
+"vp",
+"friction-angle",
+"cohesion",
+"dilatation-angle",
+};
+
+const char* pylith::materials::DruckerPragerPlaneStrainTimeDepData::_dbStateVarValues[] = {
+"stress-zz-initial",
+"plastic-strain-xx",
+"plastic-strain-yy",
+"plastic-strain-zz",
+"plastic-strain-xy",
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_dbProperties[] = {
+  2.50000000e+03,
+  3.00000000e+03,
+  5.19615242e+03,
+  5.23598776e-01,
+  3.00000000e+05,
+  3.49065850e-01,
+  2.00000000e+03,
+  1.20000000e+03,
+  2.07846097e+03,
+  4.36332313e-01,
+  1.00000000e+04,
+  4.36332313e-01,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_dbStateVars[] = {
+  1.07500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  2.57500000e+04,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+  0.00000000e+00,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_properties[] = {
+  2.50000000e+03,
+  2.25000000e+10,
+  2.25000000e+10,
+  2.30940108e-01,
+  3.60000000e+05,
+  1.48583084e-01,
+  2.00000000e+03,
+  2.88000000e+09,
+  2.88000000e+09,
+  1.89338478e-01,
+  1.21811303e+04,
+  1.89338478e-01,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_stateVars[] = {
+  1.07500000e+04,
+  4.10000000e-05,
+  4.20000000e-05,
+  4.40000000e-05,
+  4.50000000e-05,
+  2.57500000e+04,
+  1.10000000e-05,
+  1.20000000e-05,
+  1.40000000e-05,
+  1.50000000e-05,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_propertiesNondim[] = {
+  2.50000000e+00,
+  1.00000000e+00,
+  1.00000000e+00,
+  2.30940108e-01,
+  1.60000000e-05,
+  1.48583084e-01,
+  2.00000000e+00,
+  1.28000000e-01,
+  1.28000000e-01,
+  1.89338478e-01,
+  5.41383567e-07,
+  1.89338478e-01,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_stateVarsNondim[] = {
+  4.77777778e-07,
+  4.77777778e-07,
+  4.77777778e-07,
+  4.77777778e-07,
+  4.77777778e-07,
+  1.14444444e-06,
+  1.14444444e-06,
+  1.14444444e-06,
+  1.14444444e-06,
+  1.14444444e-06,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_density[] = {
+  2.50000000e+03,
+  2.00000000e+03,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_strain[] = {
+  1.10000000e-04,
+  1.20000000e-04,
+  1.40000000e-04,
+  4.10000000e-04,
+  4.20000000e-04,
+  4.40000000e-04,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_stress[] = {
+ -4.95807185e+05,
+ -3.82197636e+05,
+  7.08863124e+05,
+  5.51473672e+05,
+  5.45142209e+05,
+ -2.85351554e+05,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_elasticConsts[] = {
+  2.44487161e+10,
+  1.17789183e+10,
+ -1.66473214e+10,
+  1.09997245e+10,
+  2.10335485e+10,
+ -1.62468306e+10,
+ -1.31854142e+10,
+ -1.29851687e+10,
+  1.38346134e+10,
+  1.73722726e+09,
+  2.48498883e+09,
+ -2.42123101e+09,
+  2.48498825e+09,
+  1.68402528e+09,
+ -2.37432763e+09,
+ -1.21061568e+09,
+ -1.18716349e+09,
+  1.33926043e+09,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_initialStress[] = {
+  2.10000000e+04,
+  2.20000000e+04,
+  2.40000000e+04,
+  5.10000000e+04,
+  5.20000000e+04,
+  5.40000000e+04,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_initialStrain[] = {
+  3.60000000e-05,
+  3.50000000e-05,
+  3.30000000e-05,
+  6.10000000e-05,
+  6.20000000e-05,
+  6.60000000e-05,
+};
+
+const PylithScalar pylith::materials::DruckerPragerPlaneStrainTimeDepData::_stateVarsUpdated[] = {
+  1.07500000e+04,
+  7.52490579e-05,
+  8.37466235e-05,
+  2.04754109e-05,
+  9.17808195e-05,
+  2.57500000e+04,
+  3.24452570e-04,
+  3.34725393e-04,
+ -7.68586819e-05,
+  4.32915200e-04,
+};
+
+pylith::materials::DruckerPragerPlaneStrainTimeDepData::DruckerPragerPlaneStrainTimeDepData(void)
+{ // constructor
+  dimension = _dimension;
+  numLocs = _numLocs;
+  numProperties = _numProperties;
+  numStateVars = _numStateVars;
+  numDBProperties = _numDBProperties;
+  numDBStateVars = _numDBStateVars;
+  numPropsQuadPt = _numPropsQuadPt;
+  numVarsQuadPt = _numVarsQuadPt;
+  lengthScale = _lengthScale;
+  timeScale = _timeScale;
+  pressureScale = _pressureScale;
+  densityScale = _densityScale;
+  dtStableImplicit = _dtStableImplicit;
+  numPropertyValues = const_cast<int*>(_numPropertyValues);
+  numStateVarValues = const_cast<int*>(_numStateVarValues);
+  dbPropertyValues = const_cast<char**>(_dbPropertyValues);
+  dbStateVarValues = const_cast<char**>(_dbStateVarValues);
+  dbProperties = const_cast<PylithScalar*>(_dbProperties);
+  dbStateVars = const_cast<PylithScalar*>(_dbStateVars);
+  properties = const_cast<PylithScalar*>(_properties);
+  stateVars = const_cast<PylithScalar*>(_stateVars);
+  propertiesNondim = const_cast<PylithScalar*>(_propertiesNondim);
+  stateVarsNondim = const_cast<PylithScalar*>(_stateVarsNondim);
+  density = const_cast<PylithScalar*>(_density);
+  strain = const_cast<PylithScalar*>(_strain);
+  stress = const_cast<PylithScalar*>(_stress);
+  elasticConsts = const_cast<PylithScalar*>(_elasticConsts);
+  initialStress = const_cast<PylithScalar*>(_initialStress);
+  initialStrain = const_cast<PylithScalar*>(_initialStrain);
+  stateVarsUpdated = const_cast<PylithScalar*>(_stateVarsUpdated);
+} // constructor
+
+pylith::materials::DruckerPragerPlaneStrainTimeDepData::~DruckerPragerPlaneStrainTimeDepData(void)
+{}
+
+
+// End of file

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.hh (from rev 19598, short/3D/PyLith/trunk/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.hh)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.hh	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/DruckerPragerPlaneStrainTimeDepData.hh	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,110 @@
+// -*- C++ -*-
+//
+// ======================================================================
+//
+// Brad T. Aagaard, U.S. Geological Survey
+// Charles A. Williams, GNS Science
+// Matthew G. Knepley, University of Chicago
+//
+// This code was developed as part of the Computational Infrastructure
+// for Geodynamics (http://geodynamics.org).
+//
+// Copyright (c) 2010-2011 University of California, Davis
+//
+// See COPYING for license information.
+//
+// ======================================================================
+//
+
+// DO NOT EDIT THIS FILE
+// This file was generated from python application druckerpragerplanestraintimedep.
+
+#if !defined(pylith_materials_druckerpragerplanestraintimedepdata_hh)
+#define pylith_materials_druckerpragerplanestraintimedepdata_hh
+
+#include "ElasticMaterialData.hh"
+
+namespace pylith {
+  namespace materials {
+     class DruckerPragerPlaneStrainTimeDepData;
+  } // pylith
+} // materials
+
+class pylith::materials::DruckerPragerPlaneStrainTimeDepData : public ElasticMaterialData
+{
+
+public: 
+
+  /// Constructor
+  DruckerPragerPlaneStrainTimeDepData(void);
+
+  /// Destructor
+  ~DruckerPragerPlaneStrainTimeDepData(void);
+
+private:
+
+  static const int _dimension;
+
+  static const int _numLocs;
+
+  static const int _numProperties;
+
+  static const int _numStateVars;
+
+  static const int _numDBProperties;
+
+  static const int _numDBStateVars;
+
+  static const int _numPropsQuadPt;
+
+  static const int _numVarsQuadPt;
+
+  static const PylithScalar _lengthScale;
+
+  static const PylithScalar _timeScale;
+
+  static const PylithScalar _pressureScale;
+
+  static const PylithScalar _densityScale;
+
+  static const PylithScalar _dtStableImplicit;
+
+  static const int _numPropertyValues[];
+
+  static const int _numStateVarValues[];
+
+  static const char* _dbPropertyValues[];
+
+  static const char* _dbStateVarValues[];
+
+  static const PylithScalar _dbProperties[];
+
+  static const PylithScalar _dbStateVars[];
+
+  static const PylithScalar _properties[];
+
+  static const PylithScalar _stateVars[];
+
+  static const PylithScalar _propertiesNondim[];
+
+  static const PylithScalar _stateVarsNondim[];
+
+  static const PylithScalar _density[];
+
+  static const PylithScalar _strain[];
+
+  static const PylithScalar _stress[];
+
+  static const PylithScalar _elasticConsts[];
+
+  static const PylithScalar _initialStress[];
+
+  static const PylithScalar _initialStrain[];
+
+  static const PylithScalar _stateVarsUpdated[];
+
+};
+
+#endif // pylith_materials_druckerpragerplanestraintimedepdata_hh
+
+// End of file

Modified: short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/generate.sh
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/generate.sh	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/libtests/materials/data/generate.sh	2012-02-07 21:21:03 UTC (rev 19599)
@@ -78,6 +78,11 @@
     --data.object=GenMaxwellPlaneStrainElasticData \
     --data.parent=ElasticMaterialData
 
+  python DruckerPragerPlaneStrainElastic.py \
+    --data.namespace=pylith,materials \
+    --data.object=DruckerPragerPlaneStrainElasticData \
+    --data.parent=ElasticMaterialData
+
   # 1-D ----------------------------------------------------------------
 
   python ElasticStrain1D.py \
@@ -130,6 +135,11 @@
     --data.object=DruckerPrager3DTimeDepData \
     --data.parent=ElasticMaterialData
 
+  python DruckerPragerPlaneStrainTimeDep.py \
+    --data.namespace=pylith,materials \
+    --data.object=DruckerPragerPlaneStrainTimeDepData \
+    --data.parent=ElasticMaterialData
+
 fi
 
 

Modified: short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/Makefile.am
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/Makefile.am	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/Makefile.am	2012-02-07 21:21:03 UTC (rev 19599)
@@ -41,7 +41,8 @@
 	TestGenMaxwellPlaneStrain.py \
 	TestGenMaxwellQpQsIsotropic3D.py \
 	TestPowerLaw3D.py \
-	TestDruckerPrager3D.py
+	TestDruckerPrager3D.py \
+	TestDruckerPragerPlaneStrain.py
 
 
 # End of file 

Copied: short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/TestDruckerPragerPlaneStrain.py (from rev 19598, short/3D/PyLith/trunk/unittests/pytests/materials/TestDruckerPragerPlaneStrain.py)
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/TestDruckerPragerPlaneStrain.py	                        (rev 0)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/TestDruckerPragerPlaneStrain.py	2012-02-07 21:21:03 UTC (rev 19599)
@@ -0,0 +1,102 @@
+#!/usr/bin/env python
+#
+# ======================================================================
+#
+# Brad T. Aagaard, U.S. Geological Survey
+# Charles A. Williams, GNS Science
+# Matthew G. Knepley, University of Chicago
+#
+# This code was developed as part of the Computational Infrastructure
+# for Geodynamics (http://geodynamics.org).
+#
+# Copyright (c) 2010-2011 University of California, Davis
+#
+# See COPYING for license information.
+#
+# ======================================================================
+#
+
+## @file unittests/pytests/materials/TestDruckerPragerPlaneStrain.py
+
+## @brief Unit testing of DruckerPragerPlaneStrain object.
+
+import unittest
+
+from pylith.materials.DruckerPragerPlaneStrain import DruckerPragerPlaneStrain
+
+# ----------------------------------------------------------------------
+class TestDruckerPragerPlaneStrain(unittest.TestCase):
+  """
+  Unit testing of DruckerPragerPlaneStrain object.
+  """
+
+  def setUp(self):
+    """
+    Setup test subject.
+    """
+    self.material = DruckerPragerPlaneStrain()
+    return
+  
+
+  def test_constructor(self):
+    """
+    Test constructor.
+    """
+    self.assertEqual(2, self.material.dimension())
+    return
+
+
+  def test_fitMohrCoulomb(self):
+    """
+    Test useElasticBehavior().
+    """
+    self.material.fitMohrCoulomb(self.material.MOHR_COULOMB_MIDDLE)
+    return
+
+
+  def test_useElasticBehavior(self):
+    """
+    Test useElasticBehavior().
+    """
+    self.material.useElasticBehavior(False)
+    return
+
+
+  def testHasStateVars(self):
+    self.failUnless(self.material.hasStateVars())
+    return
+
+
+  def testTensorSize(self):
+    self.assertEqual(3, self.material.tensorSize())
+    return
+
+
+  def testNeedNewJacobian(self):
+    """
+    Test needNewJacobian().
+    """
+    # Default should be False.
+    self.failIf(self.material.needNewJacobian())
+
+    # Should require a new Jacobian even if time step is the same.
+    self.material.timeStep(1.0)
+    self.failUnless(self.material.needNewJacobian())
+    self.material.timeStep(2.0)
+    self.failUnless(self.material.needNewJacobian())
+
+    self.material.timeStep(2.0)
+    self.failUnless(self.material.needNewJacobian())
+    return
+  
+
+  def test_factory(self):
+    """
+    Test factory method.
+    """
+    from pylith.materials.DruckerPragerPlaneStrain import material
+    m = material()
+    return
+
+
+# End of file 

Modified: short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/testmaterials.py
===================================================================
--- short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/testmaterials.py	2012-02-07 21:16:56 UTC (rev 19598)
+++ short/3D/PyLith/branches/pylith-scecdynrup/unittests/pytests/materials/testmaterials.py	2012-02-07 21:21:03 UTC (rev 19599)
@@ -98,6 +98,9 @@
     from TestDruckerPrager3D import TestDruckerPrager3D
     suite.addTest(unittest.makeSuite(TestDruckerPrager3D))
 
+    from TestDruckerPragerPlaneStrain import TestDruckerPragerPlaneStrain
+    suite.addTest(unittest.makeSuite(TestDruckerPragerPlaneStrain))
+
     from TestMaterial import TestMaterial
     suite.addTest(unittest.makeSuite(TestMaterial))
 



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