[cig-commits] [commit] baagaard/add-release-2.1.0: Added description of DP plasticity changes to README. (32596cc)

[cig_noreply at geodynamics.org]

Repository : https://github.com/geodynamics/pylith

On branch  : baagaard/add-release-2.1.0
Link       : https://github.com/geodynamics/pylith/compare/a37d5744c2d3798b27bee6a7cca4751fc3f05f08...32596cc492917bbe247eafbcfb141d3e99f6394b

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commit 32596cc492917bbe247eafbcfb141d3e99f6394b
Author: Charles Williams <C.Williams at gns.cri.nz>
Date:   Mon Nov 24 11:33:19 2014 +1300

    Added description of DP plasticity changes to README.


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32596cc492917bbe247eafbcfb141d3e99f6394b
 README | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/README b/README
index 4261d5c..70c28ac 100644
--- a/README
+++ b/README
@@ -81,7 +81,20 @@ Version 2.1.0
     intersection must also come AFTER the through-going fault in the
     list of fault interfaces.
 
-  - ADD DRUCKER-PRAGER STUFF HERE
+  - There have been two major bug fixes for Drucker-Prager plasticity,
+    for both DruckerPrager3D and DruckerPragerPlaneStrain. The first fix
+    was a missing initial pressure term for the plastic multiplier
+    in the Drucker-Prager formulation. This affects plasticity
+    calculations when initial stresses are used. The error has been
+    corrected in the code, the manual, and the unit tests. The second
+    bug was an incorrect test for tensile yield that could cause
+    PyLith to exit with an error when plastic yield had not actually
+    occurred. The error would only occur when the allow_tensile_yield
+    flag was set to False. This bug has been fixed in the code, and the
+    new test is also described in the manual. This should prevent
+    problems that previously existed when allow_tensile_yield was set
+    to False (as it should be for most quasi-static problems).
+