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4.1.2.14 Uncoupled Solid Mixture
This material describes a mixture of quasi-incompressible elastic solids. It is a container for any combination of the materials described in Section 4.1.2↑.
| <solid> | Container tag for solid material |
The mixture may consist of any number of solids. The stress tensor for the solid mixture is the sum of the stresses for all the solids. The bulk modulus of the uncoupled solid mixture is the sum of the bulk moduli of the individual <solid> materials. A bulk modulus specified outside of the <solid> materials will be ignored.
Material axes may be optionally specified within the <material> level, as well as within each <solid>. Within the <material> level, these represent the local element axes relative to the global coordinate system. Within the <solid>, they represent local material axes relative to the element. If material axes are specified at both levels, they are properly compounded to produce local material axes relative to the global coordinate system. Material axes specified in the <ElementData> section are equivalent to a specification at the <material> level: they correspond to local element axes relative to the global system.
Example:
<material id="1" type="uncoupled solid mixture">
<k>30e3</k>
<mat_axis type="vector">
<a>1,0,0</a>
<d>0,1,0</d>
</mat_axis>
<solid type="Mooney-Rivlin">
<c1>2.0</c1>
<c2>0.0</c2>
</solid>
<solid type="EFD uncoupled">
<mat_axis type="vector">
<a>0.8660254,0.5,0</a>
<d>0,0,1</d>
</mat_axis>
<ksi>5, 1, 1</ksi>
<beta>2.5, 3, 3</beta>
</solid>
<solid type="EFD uncoupled">
<mat_axis type="vector">
<a>0.8660254,-0.5,0</a>
<d>0,0,1</d>
</mat_axis>
<ksi>5, 1, 1</ksi>
<beta>2.5, 3, 3</beta>
</solid>
</material>