基于加速老化与三维粘弹性有限元分析的固体导弹发动机寿命预估

为了预估固体导弹发动机的贮存寿命，通过推进剂加速老化试验，得到该推进剂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，从中得到药柱在点火增压和轴向过载联合作用下最大Von Mises应变随贮存时间的变化规律；将推进剂的延伸率与推进剂药柱最大Von Mises应变进行对比，利用结构完整性评估准则，得到发动机的贮存寿命。该方法可为固体导弹发动机的设计和使用提供参考。

Three-Dimension Viscoelastic Analysis and Accelerated Aging Approach to Predict the Service Life of Solid Missile Motor

In order to get the storage life of the solid missile motor, the variation of the extensibility of propellant in the storage period was studied by accelerated aging test and the pattern of Von Mises strain of the grain under internal pressure and axial acceleration loading was obtained using three-di- mension viscoelastic finite element method. Compared the extensibility of propellant with the Von Mises strain of the grain in different storage periods, the storage life of the solid missile motor can be predicted by the maximum Von Misses strain criterion. Above analytical method and the result may be helpful in designing or using solid missile motor.