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为研究温度载荷下的药柱累积损伤规律,应用线性累积损伤理论,建立了固体推进剂热粘弹性累积损伤模型,并根据不同应力水平下的蠕变破坏试验数据,获得了累积损伤的表达式;对药柱进行了热粘弹性有限元计算,得到了药柱危险部位的最大Von Mises应力随温度的变化规律,并讨论了不同贮存温度对药柱累积损伤的影响,最后针对典型海区的不同贮存温度进行了药柱的累积损伤算例分析。结果表明,温度是影响药柱损伤的重要因素,在热应力较大时药柱损伤并不总是较大;温度、应力大小以及作用时间共同决定着药柱的累积损伤。
In order to study the rule of accumulative damage of grain under temperature load, the cumulative thermal damage viscoelastic model of solid propellant was established by using the theory of linear cumulative damage. Based on the creep failure test data under different stress levels, the cumulative damage expression The thermal viscoelastic finite element method was used to calculate the maximum Von Mises stress at the dangerous part of the column. The influence of different storage temperatures on the cumulative damage of the column was discussed. Finally, according to the difference of the typical sea area The storage temperature was analyzed for the cumulative damage of the grain. The results show that temperature is an important factor affecting the damage of the grain, and the damage of the grain is not always larger when the thermal stress is larger. The temperature, the size of the stress and the action time jointly determine the cumulative damage of the grain.