含内聚空洞固体发动机药柱的寿命预估  

The Prediction of the Service Life of Solid Motor Grain with Cohesive Cavities

作　　者：李九天[1] 雷勇军[1] 袁端才[1] 申志彬[1] 蒙上阳[2] 

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 [2]中国人民解放军63961部队,北京100012

出　　处：《国防科技大学学报》2008年第1期15-18,共4页Journal of National University of Defense Technology

基　　金：国防科技大学预研基金资助项目(JC06-01-01);湖南省自然科学基金资助项目(02JJY2009)

摘　　要：为了对含内聚空洞固体导弹发动机的贮存寿命进行预估,采用加速老化试验,得到该推进剂最大延伸率随贮存时间的变化规律;应用三维粘弹性有限元分析方法,对含内聚空洞的发动机贮存一定时间后直接点火发射过程进行数值仿真,从中获得发动机药柱在点火增压和轴向过载联合作用下的最大Von Mises应变。将不同贮存期药柱的最大Von Mises应变值与推进剂的最大延伸率进行对比,利用结构完整性评估准则,给出了某发动机药柱不同贮存期间内聚空洞大小的允许值。该方法可为含内聚空洞固体发动机的判废提供定量参考。Cohesive cavities often occur in the solid missile motor grain. The strain field analysis of the cohesive cavity is an important problem to the evaluation of grain structural integrity. In this paper, a method to analyze the cohesive cavity＇s strain field is presented. With accelerated aging test, the variation law of the extensibility of propellant in the storage period was obtained. Using threedimension viscoelastic finite element method, the Von Mises strain of the grain with cohesive cavities under internal pressure and axial acceleration loading was analyzed. In comparing the extensibility of propellant and the Von Mises strain of the grain in different storage period, the allowable maximum diameter of the cohesive cavity in different storage period was determined by the maximum Von Mises strain criterion. The analysis of a practical motor shows that the analytical method and these conclusions are available for using solid motor with cohesive cavities.

关 键 词：固体导弹发动机 粘弹性 内聚空洞 老化试验 贮存寿命 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程]