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[Chong Luo <luo.chong@xxxxxxxxx>]

Hi,

I saw a nice example of linear elasticity demo in dolfin. 
I am trying to use FEniCS to solve incompressible
non-linear elasticity problems.

For incompressible neo-Hookean materials, the stress is
T = 2*C10*(Id + grad(u)) - p*(Id + grad(u))^{-T},
where the last "^{-T}" means transpose of inverse.

Is it possible to specify an inverse of a matrix in the .form file?

Thank you!

Best,
Chong Luo 




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