摘要
基于固体推进剂材料特性与温度和时间相关的热粘弹性理论,为提高发动机的安全性,建立了二维星孔装药的模型。利用有限元方法分析了星孔装药在温度冲击过程中的温度、应力、应变的变化过程,得到星孔药柱在温度冲击过程中所存在的危险点。着重得出了不同星尖圆弧半径、不同的星根半角对星尖处应力和应变的影响情况:当星根半角一定时,星尖处的应力值和应变值随星尖圆弧半径减小而增大,半径越小增大的速率越大;当星尖圆弧半径一定时星尖处应力应变随着星根半角的增大直线增大。
Based on thermal viscoelastic theory of solid propellant property of which is related to the temperature and time, the 2D model of the internal star - shaped grain was set up. The change process of grain＇ s stress and strain under temperature shock was calculated with finite element method. The effect of star tip arc radius and star root semiangle on the grain tip stress and strain was received, and the stress and strain change tendency along with star tip arc radius and star root semiangle was also received. It is showed that when the star root semiangle is invariable, stress and strain in star tip increase along with increasing of star tip arc radius, and the smaller the radius is, the larger the increasing speed of stress and strain is. When the star tip arc radius is invariable, stress and strain in star tip increase in a straight line along with the increasing of star root semiangle.
出处
《计算机仿真》
CSCD
北大核心
2010年第5期49-52,共4页
Computer Simulation
关键词
星孔药柱
几何参数
热粘弹性
温度冲击
Internal star - shaped grain
Geometry parameters
Thermal viscoelastic
Temperature shock
