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Subsubsection 4.1.3.11: Isotropic Elastic Up Subsection 4.1.3: Unconstrained Materials Subsubsection 4.1.3.13: Orthotropic CLE

#### 4.1.3.12 Orthotropic Elastic

The material type for orthotropic elasticity is “orthotropic elastic”. The following material parameters must be defined:
 Young's modulus in the x-direction [P] Young's modulus in the y-direction [P] Young's modulus in the z-direction [P] Shear modulus in the xy-plane [P] Shear modulus in the yz-plane [P] Shear modulus in the xz-plane [P] Poisson's ratio between x- and y-direction [ ] Poisson's ratio between y- and z-direction [ ] Poisson's ratio between z- and x-direction [ ]
The stress-strain relation for this material is given by Material axes may be specified as described in Section 4.1.1.2↑.
Example:
<material id="3" type="orthotropic elastic">
<mat_axis type="vector">
<a>0.866,0.5,0</a>
<d>-0.5,0.866,0</d>
</mat_axis>
<E1>1</E1>
<E2>2</E2>
<E3>3</E3>
<v12>0</v12>
<v23>0</v23>
<v31>0</v31>
<G12>1</G12>
<G23>1</G23>
<G31>1</G31>
</material>


Subsubsection 4.1.3.11: Isotropic Elastic Up Subsection 4.1.3: Unconstrained Materials Subsubsection 4.1.3.13: Orthotropic CLE