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188.8.131.52 Uncoupled Prescribed Isotropic Active Contraction
The material type for prescribed isotropic active contraction, in an uncoupled solid mixture, is “prescribed isotropic active contraction uncoupled”. This material must be combined with a stable uncoupled material that acts as a passive matrix, using a “uncoupled solid mixture” container as described in Section 184.108.40.206↑. The following material parameters need to be defined:
|<T0>||representing the prescribed stress||[P]|
The active stress for this material is given by Note: If the solid material in the mixture is (nearly) incompressible, this isotropic contraction will cause no change in the deformation.
Isotropic contraction in a mixture containing a Mooney-Rivlin solid.
<material id="1" type="uncoupled solid mixture"> <mat_axis type="local">0,0,0</mat_axis> <solid type="Mooney-Rivlin"> <c1>1.0</c1> <c2>0</c2> <k>5.0</k> </solid> <solid type="prescribed isotropic active contraction uncoupled"> <T0 lc="2">1</T0> </solid> </material>