Dear Tobias,
See if these are of some help:
https://github.com/jfriedlein/usrmat_LS-Dyna_Fortran
https://github.com/jfriedlein/usrmat_LS-Dyna_Fortran/issues/6
Sincerely,
James M. Kennedy
KBS2 Inc.
March 10, 2022
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