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18.104.22.168 Prescribed Isotropic Active Contraction
The material type for prescribed isotropic active contraction, in a solid mixture of unconstrained materials, is “prescribed isotropic active contraction”. This material must be combined with a stable compressible material that acts as a passive matrix, using a “solid mixture” container as described in Section 22.214.171.124↑. The following material parameters need to be defined:
|<T0>||representing the prescribed stress||[P]|
The active stress for this material is given by Example:
Isotropic contraction in a mixture containing a neo-Hookean solid.
<material id="1" type="solid mixture"> <mat_axis type="local">0,0,0</mat_axis> <solid type="neo-Hookean"> <E>1.0</E> <v>0</v> </solid> <solid type="prescribed isotropic active contraction"> <T0 lc="2">1</T0> </solid> </material>