固体火箭发动机药柱老化可靠度分析

Reliability analysis of the solid rocket motor grain aging

随着固体火箭发动机药柱的老化,其松弛模量、强度和最大延伸率等材料参数也随之改变,考虑到材料参数、载荷等具有随机性,固体火箭发动机药柱结构可靠度也是动态变化的。采用高温加速老化试验获得固体火箭发动机药柱的老化材料参数,运用有限元法对药柱结构进行建模和数值仿真,应用Gram-Charlier级数拟合出概率密度函数,最后计算出其结构可靠度,为固体火箭发动机的贮存和使用提供参考依据。

With the aging of the solid rocket engine grain,the material parameters such as relaxation modulus,strength,and maximum elongation also change.Considering that the material parameters,loads,etc.are random,the reliability of the grain structure is also dynamic.When the reliability of the grain structure is lower than the required value,the solid rocket engine should be downgraded or scrapped.Therefore,it is necessary to study the reliability of the structure of solid rocket motor.The aging material parameters of the grain are obtained by high-temperature accelerated aging test,the finite element method is used to model and simulate the structure of the grain of a solid rocket engine,and the probability density function is fitted by the Gram-Charlier series,and its structural reliability is finally calculated.It provides a reference basis for the storage and use of solid rocket Motors.