Newton Raphson

Hi,

I am currently working on a FEM  2d plane strain elastic model in matlab. The next step would be to use a non linear constiutive law (Mohr-Coulomb). As far as I have been reading non linearities, are solved with iteration schemes. My question is how to compute the tangent matrix with the N.Raphson method? I have seen only case for polynomials, but not for matrices.

Regards!

Anna

Hi,



I have been quite confused about this for sometime now. It
has not been mentioned clearly in the books/references that I have
looked into.



In transient thermal analysis with implicit scheme
or the Crank Nicolson scheme, are there Newton Raphson iterations based
on the residual vector in every time-step?







Thanks,

Shriram

--

Process Engineer

Moore Nanotechnology Systems

Keene, NH - 03431