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 Subsubsection 4.1.2.9: Ogden Up Subsection 4.1.2: Uncoupled Materials Subsubsection 4.1.2.11: Tension-Compression Nonlinear Orthotropic 

4.1.2.10 Tendon Material

The material type for the tendon material is tendon material. The tendon material is similar to the muscle material [18]. The only difference is the fiber function. For tendon material this is defined as: where The parameters and are determined by requiring and continuity at .
The material parameters for this material are listed below.
<g1> along fiber shear modulus [P]
<g2> cross fiber shear modulus [P]
<l1> exponential stress coefficients [P]
<l2> fiber uncrimping factor [ ]
<lambda> fiber stretch for straightened fibers [ ]
<k> bulk modulus [P]
The tendon fiber direction is specified similarly to the transversely isotropic Mooney-Rivlin model.
Example:
<material id="1" type="tendon material">
  <g1>5e4</g1>
  <g2>5e4</g2>
  <l1>2.7e6/l1>
  <l2>46.4</l2>
  <lambda>1.03</lambda>
  <k>1e7</k>
  <fiber type="vector">1,0,0</fiber>
</material>


 Subsubsection 4.1.2.9: Ogden Up Subsection 4.1.2: Uncoupled Materials Subsubsection 4.1.2.11: Tension-Compression Nonlinear Orthotropic