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[Chong Luo <luo.chong@xxxxxxxxx>]

And also,  how to specify the determinant of a matrix in a .form file?
Because the incompressible condition is that det(Id+grad(u))=1.

Thank you.

Chong Luo
----- 原始邮件 ----
发件人： Chong Luo <luo.chong@xxxxxxxxx>
收件人： fenics-dev@xxxxxxxxxx; fenics-dev@xxxxxxxxxx
抄送： luo.chong@xxxxxxxxx
已发送： 2008/3/20(周四), 上午11:12:28
主题： incompressible elasticity?

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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