A constitutive model is needed that matches the behavior of a vulcanized natural rubber material up to 100 percent engineering strain in a variety of deformation modes.

In this problem, the experimental data are obtained from a simulation of a hyperelastic test suite (uniaxial, biaxial, and planar tension tests) using common experimental test specimens. Using this data, parameters for a constitutive model are determined using hyperelastic fitting capabilities that focus on use of the three-, five-, and nine-parameter Mooney-Rivlin hyperelastic models.

After demonstrating the fitting procedure and selecting a suitable constitutive model, a tension-torsion experiment is simulated and compared to the experimental data to validate the predictions for the model.