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Abaqus/Explicit PlaneStress

I have alreday made a simple isotropic plasticity for 3D element and that worked well, but it is becoming compless for me to modify the subroutine to fit for PlaneStress, I made the following modification:# 

CCCC   in the beginning, 




CCCC  at the end:

  StrainInc(i,3)= dEpsPla33+fac4*(StrainInc(i,1)+StrainInc(i,2)

where,   dEpsPlaii is increment of plastic strain ii which are calculated before, and fac4 is xnu/(xnu-one).

And the final result is equivalent plastic strain is greater than the result got from abaqus model, and the equivalent plastic stress is smaller. I cant tell where the problem is......

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