固体火箭发动机含裂纹药柱应力场有限元模拟的新方法

摘要

针对研究固体火箭发动机药柱出现裂纹前、后药柱内应力／应变场的需要，提出利用奇异单元和生死单元技术模拟含三维裂纹药柱的新方法，并利用该方法对固体火箭发动机三维非贯穿裂纹进行模拟，分析药柱裂纹附近区域应力分布的规律。结果表明，该方法便捷有效，尤其适用于对比研究裂纹、脱粘等药柱缺陷引起的应力释放和应力分布的变化。%To study the variations in stress/strain field when the crack appears,a new technique to simulate 3D crack of solid rocket motor grain based on singular element and birth⁃death element was proposed. A part⁃through crack for solid rocket motor grain simulated by utilizing this method and stress distribution caused by crack were analyzed. Simulation results indicate that the method is correct,effective,and convenient for further research,especially suitable for comparative analysis on the stress distribution changes and the stress reliefs which are caused by crack or debond.