Thank you for your help!

At the moment, I use nonlinear materials available in the engineering data. Then, once I will perform tensile and/or compression testings (with polymers), I plan to define multilinear isotropic hardening. Is it enough to properly define a nonlinear material in the software?

I ran a simulation (using Structural Steel NL) and I inserted a chart with total strain and equivalent stress and it is still linear… Do you have any idea what the problem is? My goal would be to display the strain stress curve with both elastic and plastic deformations.

Thank you