含能材料变泊松比粘弹性本构及其数值实现方法

To study the viscoelastic behavior of energetic materials with variable Poisson's ratio,based on the thermorheologically simple material hypothesis,a three-dimensional thermo-viscoelastic constitutive model with time-dependent Poisson's ratio was built,and it was numerically studied and discretized into incremental form by integration algorithms,the corresponding stress-updating method was presented,then the Abaqus-based material subroutine was built using Fortran code and applied into several examples.The results show that numerical solutions agree well with corresponding analytical solutions with high accuracy,the soundness verification is passed,the designed analysis method and code is effective and would be applied to structural analysis for energetic material media such as practical explosive or propellant grain; The Poisson's ratio of viscoelastic materials is time-dependent,and its small change has a significant impact on the calculation results, especially in the short-term loading or state transition region.