New question #690521 on Yade:
https://answers.launchpad.net/yade/+question/690521

Dear all,

I'm trying to obtain an exponential softening shear behavior 
(damage-plasticity) after peak stress instead of Mohr-coulomb failure with 
cohesion which is currently implemented CPM model in Yade.
shear stress will be calculated as follows,

sigma_S= k_s*(1-D)*(Us-Us_Pl) where D is scalar damage variable and sigma_S,Us, 
Us_Pl are vectors

D=exp(-|Us_pl|/constant);  where , |*|  : maginitude

and yield criteria is

F=|sigma_S|- Cohesion*(1-D)  ,  cohesion is scalar value say ,1e6 like that


from yield function F, I can calculate the scalar value of plastic shear 
displacement, but the problem is how to update the plastic shear displacement 
vector?

Could you please help me to solve this issue?





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