Whenever I am running the umat for clay hypoplasticity, it is getting exited in ABAQUS by fulfilling the criteria testnan=1. It is failing the check – “check whether the strain rate from the ABAQUS is not NAN “. How can I resolve the issue? I am able to run the umat for sand hypoplasticity successfully though!
Problem with UMAT for clay hypoplasticity. Program exiting.
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