Modified Burgers creep model

Based on the subroutine VUMAT,user-defined material model in the nonlinear FEM software ABAQUS/EXPLICIT,a nonlinear viscoelastic constitutive model is developed.The validify of the subroutine has been proven through the standard uniaxial tensile model.The shortage of ABAQUS which only has linear viscoelastic constitutive model is remedied.This paper presents the process of developing a material constitutive model and some useful technology.It can be referred for extending the material constitutive model in ABAQUS.