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Theory Manual Version 3.6
 Subsection 5.3.7: Fiber with Exponential Power Law Uncoupled Up Section 5.3: Nearly-Incompressible Materials Subsection 5.3.9: Tension-Compression Nonlinear Orthotropic 

5.3.8 Fung Orthotropic

The hyperelastic strain energy function for a Fung Orthotropic material is given by [44, 43] where Here, and , where are orthonormal vectors that define the initial direction of material axes. The orthotropic Lamé coefficients should be chosen such that the stiffness matrix, is positive definite.
 Subsection 5.3.7: Fiber with Exponential Power Law Uncoupled Up Section 5.3: Nearly-Incompressible Materials Subsection 5.3.9: Tension-Compression Nonlinear Orthotropic