I have been using hypoplastic subroutine supplied by this website. It works well in ABQ6.14 and ABQ2017.
However, recently I have to upgrade to ABQ2021 due to an expired FORTRAN compiler in older ABQ versions.
Once I upgrade the ABQ the subroutine does not work. no error in .DAT file, also ABQ couldn’t progress to creating .STA file.
I have tried it using a complex model, single element model (those models wored before in ABQ2017), and even I tried with the files for ISA-hypoplastic in ABQ2021.
Has any of you faced the same issue?
nb. linking Abaqus, ABQ2021 verify -user_std is ok. I even tried to run one of the UMAT verification files from Abaqus documentation. it works.
any idea what could be the problem is?