Hyperelasticity demo: which constitutive model?

1

Hi all,

out of plain curiosity I would like to know which constitutive model is used in the hyperelasticity demo?
The documentation only refers to it as compressible neo-Hookean material. Does anyone have a reference for this formulation?

Thanks!

2

Hello
Please look at this book chapter (Equation: 4.4.60)

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