Different material models for chamber sphere

[KatrinKoesler]

Problem

The current chamber sphere model uses a Mooney-Rivlin material, but other material models may model cardiac mechanics better (e.g. Holzapfel-Ogden exponential material).

Solution

Add other material formulations within a Material class from which the appropriate stress response can be fed into ChamberSphere block. The material law to be used in the simulation can be chosen in the input file.

Additional context

No response

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