HyperElastic or ViscoElasic material properties

Hi,

I have an steel tube with elastomer bounded inside it. A core with elliptical shape is rotating inside the ID of the elastomer. The elastomer is under cyclic pressure and mechanical loads and deformation caused by water pressure and core rotation. Since the shear modulus of the elastomer depends on the rotation speed of the core, I thought Viscoelastic material properties capture more of this application comparing with hyperelastic properties.

I though that we should invest on defining the time dependent shear relaxation modulus rather than having Mooney-Rivlin constants. What do you think?

I also thought since the deformation is very limited (about 2-5% strain) linear material property is suitable for this application rather than hyperelastic material properties. Any suggestions?

Any help on this matter will be highly appreciated.

Thank you,

Hossein

I agree with your suggestions.

If the strains everywhere are < 5% then you can likey use a linear viscoelastic material representation based on linear elasticity.