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Theory Manual Version 3.6
 Subsection 5.3.1: Mooney-Rivlin Hyperelasticity Up Section 5.3: Nearly-Incompressible Materials Subsection 5.3.3: Veronda-Westmann Hyperelasticity 

5.3.2 Ogden Hyperelastic

The Ogden material is defined using the following hyperelastic strain energy function: Here, are the deviatoric principal stretches and and are material parameters. The term is the volumetric component and is the determinant of the deformation gradient.
Note that the neo-Hookean and Mooney-Rivlin models can also be obtained from the general Ogden strain energy function using special choices for and .
 Subsection 5.3.1: Mooney-Rivlin Hyperelasticity Up Section 5.3: Nearly-Incompressible Materials Subsection 5.3.3: Veronda-Westmann Hyperelasticity