Thank you for sharing. So the material curves you provided. Do they make physical sense to you? For example, a uniaxial tensile test that has a negative slope means that if I push to material into compression, it will stretch. In other words, negative stress, gives a positive strain.
It seems this material is a type of silicone right? Would you expect this behavior? Did the paper you get this from have the stress-strain curves to verify against? Also, there are some hyperleastic material models that even though are the same name, the implementation is a bit different. For example, in Ansys and Abaqus, there can be a difference in the implementation even though the coefficients seem to be the same symbols.
Can you share your material reference, or elaborate? Thank you.
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