Ram Gopisetti
Ansys Employee
I guess you want the material model and their properties, in general springs can be generalized to FE bodies with given stiffness and damping . Sponges are categorized as the foams and in general, you can find all foam material models and properties in any Journal related to automobile and Materials. Rubbers are already given in the Engineering data under hyperplastic materials, you can use any fitting model such as Odgen, Boyce,Mooney-Rivlin etc. to fit the model and employ in your simulation and for more rubber types.
you can first do the literature review so that you might find the data in regards to the materials and models used by researchers.
Cheers, Ram