fenics team mailing list archive

[Chong Luo <luo.chong@xxxxxxxxx>]

Ah, please forgive my ignorance. 

Now I understand that I have to linearize the problem,
before using FEniCS to solve it.

Sorry about my ignorance and have a nice day!

Best,
Chong Luo
----- Original Message ----
From: Chong Luo <luo.chong@xxxxxxxxx>
To: fenics-dev@xxxxxxxxxx; fenics-dev@xxxxxxxxxx
Cc: luo.chong@xxxxxxxxx
Sent: Thursday, March 20, 2008 11:12:28 AM
Subject: 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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