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How can I use a UMAT subroutine in Abaqus?

How can I use a UMAT subroutine in Abaqus?

How can I use a UMAT subroutine in Abaqus?

(OP)
Hi,

It is the first time that I want to use a UMAT subroutine in Abaqus. I have a Umat subroutine which is written by FORTRAN (*.f). To use the subroutine I have chosen user define in material and I wish to select the subroutine file when I wanted to define the job. But I could not select this file and I got the error "the subroutine should have *.for format"). What does it mean and how can I use UMAT in Abaqus? Does anyone have a Umat example to put here that I can use that in Abaqus 6.9?

C,
A

 

RE: How can I use a UMAT subroutine in Abaqus?

Just change the file extension to .for and it should allow you to select it. I don't understand why there is a need to do this but on the very few occasions I've used subroutines they have run fine with just the change.

HTH,
Dan

RE: How can I use a UMAT subroutine in Abaqus?

With the usual setup .for is for windows machines while .f is for unix.

RE: How can I use a UMAT subroutine in Abaqus?

(OP)
Thanks for your help.

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