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Theory Manual Version 3.6
 Subsection 5.3.9: Tension-Compression Nonlinear Orthotropic Up Section 5.3: Nearly-Incompressible Materials Section 5.4: Viscoelasticity 

5.3.10 Holmes-Mow Uncoupled

The uncoupled hyperelastic strain-energy function for this material is given by [51], where and Here, is the shear modulus and is the exponential nonlinearity coefficient. The corresponding spatial stress and elasticity tensors are and respectively. Note that does not reduce to zero when , but does. These expressions can be substituted into (2.4.3-10) and (2.4.3-16) to evaluate the final expressions for the Cauchy stress and spatial elasticity tensors, respectively.
 Subsection 5.3.9: Tension-Compression Nonlinear Orthotropic Up Section 5.3: Nearly-Incompressible Materials Section 5.4: Viscoelasticity