Abaqus Curve fitting
I am trying to evaluate a compression test data carried out on an NBR elastomer in order to obtain a proper hyperelastic material model using Abaqus hyperelastic idealisation. the problem I am facing is that Abaqus only predicted stability on Van der waals and Neo-Hooke model, and the curves generated for these models doesnt seem to match with the one obtained from experiment. Will i be right if i choose the stable models, no minding if the curves match, if no? will you be kind enough to give me a push on what to do?