[CIG-SHORT] plastic deformation

[Birendra jha]

Brad

1. I tried lengthscale of 1 m and 0.01 m, same results. I changed timescale to 1 day, no difference.
2. Using ElasticIsotropic3D, nonlinear solver converges in one iteration as expected.
3. I tried changing the maximum value of the load (the load changes sinusoidally). Usually, it converges at lower values but I may not see plastic strain. I would like to see some plastic strain.
4. I also reduced the friction-angle from 40*degree to 30*degree. 

I will try few more things.

Thanks
Birendra
--------------------------------------------
On Thu, 10/2/14, Brad Aagaard <baagaard at usgs.gov> wrote:

 Subject: Re: [CIG-SHORT] plastic deformation
 To: cig-short at geodynamics.org
 Date: Thursday, October 2, 2014, 10:50 AM
 
 Birendra,
 
 It would help to know what you
 have tried to resolve this problem? Have 
 you checked the scales used in the
 nondimensionalization? Have you 
 verified
 convergence for the same problem with a linear elastic 
 material? Does a linear elastic material
 converge in one nonlinear solve 
 iteration?
 What else have you tried?
 
 Regards,
 Brad
 
 
 On 10/2/14, 6:39 AM,
 Birendra jha wrote:
 > Hi
 >
 > I am trying to run a
 plastic deformation case with the DruckerPrager3D material.
 The nonlinear solver does not converge. Attached are my
 files, which run.
 >
 >
 It's a very small setup: 10x1x1 column, loaded at one
 end with a cyclic load that leads to compression and tension
 in the column in a sinusoidal manner.
 > I
 want to compare the plastic strain output with my analytical
 solution.
 >
 > Can
 someone please take a look and help me with the convergence
 issue?
 >
 > Thanks
 > Birendra
 >
 >
 >
 >
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