摘要
为分析大过载下发动机装药的强度,采用基于Total Lagrangian方法的三维粘弹性大变形增量本构关系,用有限元方法对某轴向高过载下固体火箭发动机装药在发射过程中的应力应变场进行了数值模拟.结果表明,装药的最大等效Von Mises应力及应变值均发生在装药底部,根据最大变形能理论,最大等效应力及应变均不会引起装药结构破坏.装药与支撑面接触面积的变化,会引起装药最大等效应力和最大等效应变的变化.在装药内外两侧进行切削,会在相应位置引起应力集中.
To analyze the intensity of grain under high overload, three-dimentional viscoelastic large deformation incremental constitutive equation was derived based on Total Lagrangian method. By finite element method, the stress and strain distribution of grain of solid rocket during launching was simulated. The results show that the maximun equivalent Von Mises stress and strain appear on the base of the grain, and the grain would not destroyed by them. The change of the contact area between the grain and the motor case can affect the value of the maximun equivalent Von Mises stress and strain. The cutting on the both sides of the grain brings about the stress convergency.
出处
《弹道学报》
EI
CSCD
北大核心
2009年第2期19-22,共4页
Journal of Ballistics
基金
国防基础预研基金项目
关键词
炮射导弹
装药
高过载
有限元
应力
artillery missile
grain
high overload
finite element
stress
