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[Question #690521]: Exponential softening shear force after peak-implimentation

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From: chanaka Udaya <question690521@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 07 May 2020 04:03:31 -0000
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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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