I have three modules (in free form .f90 format) which are being called from inside of a UMAT subroutine in ABAQUS, in the following manner:
module module_A
use module_C
use module_B
....
end module_A
module module_B
use module_C
....
end module_B
module module_C
....
end module_C
subroutine UMAT(STRESS,...)
....
Here the subroutines from module_A and module_B are being called
...
end subroutine UMAT
Now, what is the appropriate format for writing these modules with UMAT subroutine? How to merge different module files into a single *.for file (free format)?
You can just hack together all subroutines into one .for file, ignoring the modules. As long as you don't have naming issues (same subroutine names, not sure how common blocks are dealt with, I've never used modules in Fortran before, that might be an issue as well) it should be OK.
Alternatively you could play with the Abaqus environment files and set the commands sent to the compiler, but I'm not sure if it handles modules.
Dear David Sziroczak,
Thank you for your reply.
I have tried to put all the modules in one single .for file one by one and write the UMAT subroutine at the end. When I submit the job in abaqus for analysis, it gives me the following error message:
'Problem during compilation - H:\ABAQUS_anlys\UMAT_Jobs\UMAT_subroutine.for'
Could you please suggest me how to handle this error?
On the other hand, I don't know what are the things need to be changed in abaqus environment file for handling fortran modules in UMAT subroutines.
Regards,
Dipaloke
Compilation error can be anything, a typo, wrong standard of fortran, literally anything... did you remove the lines which define the modules or just pasted the whole thing into one file? I would try just to keep the subroutines.
Also, might be obvious, have you tested if the Fortran code you have compiles on its own (and works as intended?) with your compiler?
I have pasted the modules one by one without removing any lines. Then, I pasted the UMAT subroutine.
"I would try just to keep the subroutines." - by this comment are you suggesting me to write the code in a straight forward way, i.e. without using modules? Please clarify it.
Yes, I have tested the code (with modules) using Ms Visual studio with Intel FORTRAN composer and it was compiling. But, when I try to assemble all the modules in a single file (to feed to ABAQUS), all the problems begins.
Yes what I suggest is to just copy the individual parts between the "Subroutine" and "END" , but none of the module definitions, so your code will become a single monolithic code, not one separated into modules.
Dear David Sziroczak,
I have started to prepare one monolithic code by eliminating modules as I failed to incorporate modules in UMAT subroutine which accepts ABAQUS.
Thank you for your reply. It is really helpful.
Regards,
Dipaloke
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