DEVELOPING OF A CONSTITUTIVE MODEL FOR SOLID PROPELLANT BASED ON VUMAT

The linear viscoelastic constitutive model,which in most popular FEM(finite element method) software,is unsuitable for solid propellant with large deformation.Based on the subroutine VUMAT(vectorized user defined material subroutine),a nonlinear viscoelastic constitutive model developed by Swanson was implemented into Abaqus.The constitutive model was coded using Fortran,and can be called as a subroutine.The validify of the subroutine had been proven through the standard uniaxial tensile model.The subroutine can be used for the analysis of large solid rocket motor.The shortage of Abaqus which only has linear viscoelastic constitutive model is remedied.Some useful technology,including the detail process of implementing a material constitutive model,was presented.It can be referred for extending the material constitutive model in Abaqus.