FE Realization of Thermo-Visco-Plastic Constitutive Models using VUMAT in ABAQUS/Explicit Program

摘要

ABAQUS software has provided many kinds of element types and material models in its libraries for users. But with the rapid development of industrial technology the material models in the current material library of ABAQUS cannot well describe some practical problems such as ultra-high-speed cutting. However, ABAQUS provides the ability of allowing users to introduce their self-defined materials into the main program by user subroutine (UMAT or VUMAT) so as to get more accurate simulation results for their specific problems. In this paper, the method of how to realize a user-defined generalized material model in ABAQUS/Explicit program by the explicit user materials subroutine VUMAT is presented in details. Compared with UMAT in ABAQUS/Standard, VUMAT adopts explicit integration algorithm (e.g. Forward/Backward Euler methods) for stress updating. It doesn’t need iterations and Jacobian and so makes the computational efficiency enhanced greatly.