HYPERELASTIC MATERIALS INCOMPRESSEBILITY FACTOR D1

I am currently running simple explicit dynamics impact test where I am impacting a rectangular sandwich on a rigid wall. I am trying to use hyperelastic materials and the data I have currently is only uniaxial. Using Mooney Rvlin 5 parameter curve fit, I am getting an icompressibility factor D1 of 0 which explicit dynamics solver does not accepts. What should I do to make it work?


I tried making it 1e-5, it runs but not sure if it is giving the right analysis results and what implications it poses. I would also appreciate if someone explains what this parameter exactly is.

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