On 8/13/08, Robert Cimrman <cimr...@ntc.zcu.cz> wrote:

Hi all, and Ryan in particular,

I have started implementing large deformations into the code. Nothing is
finished yet, but I have already some proof-of-concept.

I will commit relatively soon (i.e. after my holidays) a patch adding
the hyperelastic neo-Hookean material.

Ultimately, I would like to have in SfePy all the functionality I had in
its predecessor (a matlab code called mafest1), but it is a long term
goal, as it was more a one-purpose tool than a general FE system.

All that the old code can do is nicely summarized in my thesis, that you
can find at

http://ui505p06-mbs.ntc.zcu.cz/sfe/RobertCimrman

at the bottom (thesis.pdf).

Ryan, try to look in particular at Section 2.1.2 (TL formulation),
Chapter 3 (FE discretization in TL context) and Chapter 6 (FE
discretization in a linear problem context), as it may provide you some
insight. Appendix A might be also interesting, as the usual constitutive
(stress-strain) relations are summarized there, e.g. the neo-Hookean one.

r.