You can select the user-defined power law to specify creep behavior with user subroutine CREEP. This user subroutine provides a very general capability for implementing viscoplastic models such as creep and swelling models in which the strain rate potential is a function of equivalent pressure stress, ; the von Mises or Hill's equivalent deviatoric stress, ; and any number of solution-dependent state variables. Solution-dependent state variables are used in conjunction with the constitutive definition; their values evolve with the solution and can be defined in this subroutine. Examples are hardening variables associated with the model. You can also use user subroutine CREEP to define very general rate- and time-dependent thickness-direction gasket behavior. | |||||||