ABAQUS/StandardandABAQUS/Explicithaveinterfacesthatallowtheusertoimplementgeneralconstitutiveequations.–InABAQUS/Standardtheuser-definedmaterialmodelisimplementedinusersubroutineUMAT.–InABAQUS/Explicittheuser-definedmaterialmodelisimplementedinusersubroutineVUMAT.•UseUMATandVUMATwhennone