Discussion Forum

Hello,

I am working on a problem that involves plastic strain with polymers, I have stress-strain data of the material, However when I try to model it as Non-linear Uniaxial data, my solutions never converge. I attempted to define very simple problems and I am always unable to get a solution.

My workaround was to use the approach used in the "elasto-plastic plate" model, that defines hardening as following max(0,stress_strain_curve(solid.epe+solid.mises/solid.E)-solid.sigmags), given that i have already fitted my stress-strain data into the stess-strain curve. However, I am not quite sure if this approach is valid for polymers, The documentation mentions it is valid for metals.

So I need help either with one of the following
1. How to get the non-linear material model to converge
2. Verifying this formula for polymers or if there is another preferred method?

Thanks