I am creating a simulation of a three layered golf ball against a rigid target.

The core and mantle layers have hyperelastic and viscoelastic properties. The results I obtain for the Coefficient of Restitution when using hyperelastic and viscoelastic properties are the same as when I just use hyperelasticity, i.e. viscous dissipation is not being taken into account.

This is the warning message I got when running the model with both Hyperelastic and Viscoelastic properties:

For an abaqus/explicit analysis containing a *hyperelastic or *hyperfoam
material with *viscoelastic properties, the strain energy output includes
the contribution of viscous dissipation. Special care should be exercised
when interpreting strain energy results.

Does anybody know why viscous dissipation is not being implemented? Im guessing its something to do with the strain energy. How do I implement it?

I am using C3D8R elements in my mesh. Is this element type suitable for hyperelasticity and viscoelasticity?

Many thanks in advance, any help is appreciated.