[CIG-SHORT] plastic deformation

[Birendra jha]

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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