I have been struggling with my simulation for some time, and I really am beginning to believe it all comes down to my material model. I have stress-strain tensile test data for a biological tissue. The plot is attached. I have been assuming isotropic, hyperelastic and been using the Marlow hyperelastic material model. The model worked adequate when running an axisymmetric model, but when I switched to a 2D or 3D quarter-symmetry model the problems escalated to now I am unable to get the model to run hardly at all. Unfortunately, I must use the data from the tensile testing in some fashion. Does anyone have any suggestions to get a material to work adequately with my model? I have also attached an input file I have been working with. Thanks for any ideas.
