I am starting to write and test VUMAT for my Abaqus simulation. Since mine is a linux system and I can't buy a licensed Intel Visual Fortran Compiler, I am using the default gfortran compiler available in linux. I tested a single material VUMAT and it got compiled. Abaqus was able to read it and use it for analysis.
The problem arises for a multi-material VUMAT. It shows no compilation errors. But when I submit it along with my Abaqus job, Abaqus gives the following error. The .msg file is not formed and the .sta file is empty.
'Illegal memory reference' (signal 11).
The same VUMAT gets compiled and the input file gets executed when compiled using Intel Visual Fortran compiler on another system.
Please let me know any changes to be made in the gfortran compiler or if additional information is needed.
Thank you.
The following method is suggested in ABAQUS documentation for running more than 1 material models:-
To use more than one user-defined material model, the variable cmname can be tested for different material names inside user subroutine VUMAT, as illustrated below:
if (cmname(1:4) .eq. 'MAT1') then
call VUMAT_MAT1(argument_list)
else if (cmname(1:4) .eq. 'MAT2') then
call VUMAT_MAT2(argument_list)
end if
VUMAT_MAT1 and VUMAT_MAT2 are the actual user material subroutines containing the constitutive material models for each material MAT1and MAT2, respectively. Subroutine VUMAT merely acts as a directory here. The argument list can be the same as that used in subroutine VUMAT. The material names must be in uppercase characters since cmname is passed in as an uppercase character string.
You can write both models in same file then call them the way it is prescribed in the documentation.
Good luck!
Hello Rahul,
thank you for explaining the procedure for including multiple materials in the same VUMAT file. I will try it out.
Sri Krishna
Hi Sri Krishna,
I am trying to run a VUMAT subroutine with abaqus 6.14-5 and gfortran as compiler, but I am not succeeding. I have plenty of error messages like:
Error: Non-numeric character in statement label at (1)
...
I just read that you have gfortran working at least when the VUMAT subroutine handles only one material. Do you have any suggestions to solve my problem?
- Badges
- Science topic