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equivalent plastic strain works with mohr-coloumb plastity??

can i use the equivalent plastic strain to evalute the state of the elements (yield or elastic) when the i use Mohr-Coloumb plasticity (Abaqus 6.6).

 i am asking this question because i made a model to simulate  the uniaxial compression test using mohr-coloumb plasticity, but i find that the equivalent plastic strain remain constant at all elements, i am sure that the it should change from the edged of the sample to the core of the sample.

the second thing that seem very strange, is that when i change the applied load i find that the equivalent plastic strain also did not changed.

i do not know what is going on,

i hope one of my friends help me.

regards,

Gamal

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