Hi Evan,
I have created a user material in ABAQUS by using UMAT. Since I am a pretty
bad fortran programmer I do a lot mistakes. I also found the debugging process
difficult since the umat you are should be writing is linked into a program
which I don't how to debug. My solution to the problems was to write
everything in Matlab. Once the constitutive equations were working properly it
was an easy task to translate from matlab to fortran. It is a big step to go
from equations on paper to a working code. Of course matlab is very much
easier since the handling of matrices is a strength of matlab and weakness in
fortran...... As help in the matlab programming I used a FE package called
CALFEM (Computer Aided Learning of the FE Method or something).
/Henrik
Evan A Zamir wrote:
> Hi, all. I'm new to this list. I'm trying to model a nonlinear anisotropic
> material, and I guess that means I need to create a UMAT subroutine. From
> what I've read it seems like a daunting task. Does anyone out there have
> any advice on how to get started with this? Thanks, in advance.
> -evan zamir
> Dept. of Biomedical Engineering
> Wash.U. in St. Louis
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