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126.96.36.199 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 188.8.131.52↑. 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>