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User subroutine UFIELD: allows you to prescribe predefined field variables at the nodes of a model—the predefined field variables at a node can be updated User subroutine VUTRS: can be used to define a temperature-time shift for a time domain viscoelastic analysis;. will be called for all material points of User subroutine to define damage variable for the Mullins effect material model. “Mullins effect,” Section 22.6.1 of the Abaqus Analysis User's Guide. Overview. User subroutine VOIDRI: will be called to define initial void ratio values at material calculation points of continuum elements ( The user subroutines in Abaqus allow the program to be customized for particular applications, which are not available through main Abaqus facilities. The exception is the modiÞed Riks static procedure ( Static stress analysis, Section 6.2 of the Abaqus Analysis User s Manual), for whichÒÎØÍ=2 and theÞrstAbaqus/Explicit analysis. Each section discusses a particular subroutine. The sections are organized alphabetically according to the subroutine name. •. “Abaqus User subroutine to define a hyperelastic material. “Hyperelastic behavior of rubberlike materials,” Section 22.5.1 of the Abaqus Analysis User's Manual.