I am analysing the isotropic viscoplasticity and I was confused about one thing as follows:
I wrote the main program called HULL.f to check the results of UMAT subroutine. The Hull.f file ran well in the Fortran software as I thought but when I bring UMAT into Abaqus CAE to compile together with this UMAT, I always get the error
Error in job tensile: The executable /opt/abq/6.7-1/exec/standard.exe aborted with system error Illegal memory reference (signal 11). Please check the .dat, .msg, and .sta files for error messages if the files exist. If there are no error messages and you cannot resolve the problem, please run the command abaqus job=support information=support to report and save your system information. Use the same command to run Abaqus that you used when the problem occurred. Please contact your local Abaqus support office and send them the input file, the file support.log which you just created, the executable name, and the error code. Job tensile aborted due to errors.
I checked all parameters of material model. They are no wrong at all.
Actually I also doubt that there is a problem in Newton Raphson method to compute delta_plasticstrain....:confused:
Please let me know your good ideas based on your experience before for isotropic viscoplasticity within Implicit Euler.
Thanks a lot