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Subsubsection 4.1.3.18: Coupled Veronda-Westmann Up Subsection 4.1.3: Unconstrained Materials Subsubsection 4.1.3.20: Perfect Osmometer Equilibrium Osmotic Pressure

#### 4.1.3.19 Ogden Unconstrained

This material describes an unconstrained hyperelastic Ogden material [48]. The following material parameters must be defined:
 Coefficient of n term, where n can range from 1 to 6 [P] Exponent of nterm, where n can range from 1 to 6 [ ] Bulk-like modulus [P]
The hyperelastic strain energy function for this material is given in terms of the eigenvalues of the right or left stretch tensor: Here, are the eigenvalues of the right or left Cauchy deformation tensor, , and are material coefficients and ranges from 1 to 6. Any material parameters that are not specified by the user are assumed to be zero.
Example:
<material id="1" type="Ogden unconstrained">
<m1>2.4</m1>
<c1>1</c1>
<cp>2</cp>
</material>


Subsubsection 4.1.3.18: Coupled Veronda-Westmann Up Subsection 4.1.3: Unconstrained Materials Subsubsection 4.1.3.20: Perfect Osmometer Equilibrium Osmotic Pressure