I would like to properly model a rubber (NBR) element in my FE analysis. I would use an *HYPERELASTIC material, using one of the avaliable models in ccx. Unfortunately, I do not manage to find a good set of numbers to feed the material model for, e.g., an NBR 60 shoreA. I do not need a very accurate constitutive model; the expected maximum deformation is indeed small and the aim of this activity is mainly to compare different geometries and material hardnesses.
Do you know if there is a repository or papers or websites where I can find such information?