Finite element method for viscoelastic medium with damage and the application to structural analysis of solid rocket motor grain

作     者：DENG Bin SHEN ZhiBin DUAN JingBo TANG GuoJin 

作者机构：College of Aerospace Science and EngineeringNational University of Defense Technology 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2014年第57卷第5期

页      面：908-915页

核心收录：

学科分类：080703[工学-动力机械及工程] 082502[工学-航空宇航推进理论与工程] 08[工学] 0807[工学-动力工程及工程热物理] 0825[工学-航空宇航科学与技术] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.11132012) 

主　　题：composite solid propellant viscoelasticity with damage f＇mite element method integration algorithm stress-updatingmethod 

摘      要：This paper studies the damage-viscoelastic behavior of composite solid propellants of solid rocket motors(SRM).Based on viscoelastic theories and strain equivalent hypothesis in damage mechanics,a three-dimensional(3-D)nonlinear viscoelastic constitutive model incorporating with damage is *** resulting viscoelastic constitutive equations are numerically discretized by integration algorithm,and a stress-updating method is presented by solving nonlinear equations according to the Newton-Raphson method.A material subroutine of stress-updating is made up and embedded into commercial code of *** material subroutine is validated through typical *** results indicate that the finite element results are in good agreement with the analytical ones and have high accuracy,and the suggested method and designed subroutine are efficient and can be further applied to damage-coupling structural analysis of practical SRM grain.