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Dear STKO Team,

which physical property is given for modelling a rubber material as cushion material in piled raft foundation.

Rubber in general should be modelled with an Hyper-Elastic material if you want to analyze it under very large deformation.
But this is not the case.
I think cushion is used in composite pile-raft foundation just to redistribute the stress of the piles. So you can just use an Elastic Isotropic material

Thankyou so much for the reply. One more query about the element property. Which element property is suitable for rubber material as cushion. I provide SSPbrick element is it ok.

Any solid element is fine

Thankyou so much for the reply

You're welcome