奇异裂纹单元在固体导弹发动机药柱裂纹分析中的应用  

The Using of Singular Crack Elements in Crack Analysis of Solid Missile Motor Grain

作　　者：袁端才[1] 雷勇军[1] 唐国金[1] 蒙上阳[1] 

机构地区：[1]国防科技大学航天与材料工程学院,湖南长沙410073

出　　处：《试验技术与试验机》2006年第2期1-4,17,共5页Test Technology and Testing Machine

基　　金：国防科大预研基金项目(JC0201004);湖南省自然科学基金资助项目(02JJY2009)

摘　　要：为评估含裂纹的固体导弹发动机能否正常点火发射,利用奇异裂纹单元进行固体发动机药柱的裂纹分析。在发动机点火增压与轴向过载作用下,于发动机药柱危险截面的翼锥根部构建二维奇异裂纹单元,模拟裂纹扩展。随着裂纹的扩展,分别计算对应裂纹深度的应力强度因子,由此判断裂纹的稳定性。The solid missile motor with cracks is very dangerous when it is lunched, because the surficial crack might be propagation unstable when the internal pressure enters the surficial crack cavity. In order to insure the solid missile motor with surficial cracks can be lunched normally, singular crack element is used to analyse the surficial crack of solid missile motor. Under igniting pressure and axial acceleration loading, the crack is preset along dangerous direction in the most dangerous middle section. Two-dimension singular crack elements at the crack tips are established to simulate the crack propagation. Along with the crack propagation, the stress intensity factors of the cracks are respectively calculated to prejudge the cracks stability.

关 键 词：固体发动机 奇异裂纹单元 裂纹扩展 应力强度因子 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]