Is there an example of usermat for modeling hyperelastic material?

Yes, we have a sample usermat for modeling hyperelastic material. The documentation and files are attached.

NOTE: The ANSYS program has another user programmable feature, USERHYPER.F, which is much easier to implement for user-defined hyperelastic models.

USERHYPER is much easier if (a) the strain energy function is expressed as a function of the strain invariants (which is the case for many models) and (b) the user can live with the fact that the current implementation forces use of Mixed u-P formulation.

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