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 Subsubsection 4.1.2.2: Ellipsoidal Fiber Distribution Uncoupled Up Subsection 4.1.2: Uncoupled Materials Subsubsection 4.1.2.4: Ellipsoidal Fiber Distribution Veronda-Westmann 

4.1.2.3 Ellipsoidal Fiber Distribution Mooney-Rivlin

The material type for a Mooney-Rivlin material with an ellipsoidal continuous fiber distribution is “EFD Mooney-Rivlin”. The following material parameters need to be defined:
<c1> Mooney-Rivlin parameter c1 [P]
<c2> Mooney-Rivlin parameter c2 [P]
<k> bulk modulus [P]
<beta> parameters [ ]
<ksi> parameters [P]
The stress for this material is given by, Here, is the stress from the Mooney-Rivlin basis (Section 4.1.2.7↓), and is the stress contribution from the ellipsoidal fiber distribution (Section 4.1.2.2↑). The orientation of the material axes can be defined as explained in detail in Section 4.1.1↑.
Example:
<material id="1" type="EFD Mooney-Rivlin">
  <c1>1</c1>
  <c2>0</c2>
  <beta>4.5,4.5,4.5</beta>
  <ksi>1,1,1</ksi>
  <k>20000</k>
  <mat_axis type="local">0,0,0</mat_axis>
</material>


 Subsubsection 4.1.2.2: Ellipsoidal Fiber Distribution Uncoupled Up Subsection 4.1.2: Uncoupled Materials Subsubsection 4.1.2.4: Ellipsoidal Fiber Distribution Veronda-Westmann