After downloading the umat_vec.f related files (and the spw_hy.inp (publishe by Fellin at all) I got runtime problems in Abaqus 2020 during the first step.
The error message in the log file looks like:
Begin Abaqus/Standard Analysis
4/2/2025 3:10:28 PM
Run standard.exe
UMAT: illegal (negative) actual void ratio detected
Program terminated.
UMAT: actual void ratio e: 0.000000000000000E+000
less than ed 0.484773206005371
Maybe reducing ABAQUS step size will help
UMAT: illegal (negative) actual void ratio detected
Program terminated.
Any help concerning this problem will be highly appreciated.
