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Convergence of plastic soft materials

Convergence of plastic soft materials

Convergence of plastic soft materials

(OP)
I have a material that is soft plastic with the isotropic hardening curve:
Hydrostatic    Volumetric Plastic Strain
Pressue
(Pa)
500              0
2000              0.0660498
4000              0.0990747
10000              0.142731
20000              0.175756
50000              0.219413
100000            0.252438
 
I analyze it under large deformation trying both quadratic and linear elements .the linear didi not work at all . For the quadratic the job moves two steps but in the third it reaches to a point where the time increment becomes 1E-08 and then aborted giving  the message
“ 8 negative eigenvalues , Excessive distortion of 176 integration points” .
Any modeling recommendation on how treating this issue

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