基于能量耗散的药柱粘弹性累积损伤

Viscoelastic cumulative damage of dolid propellant grain based on energy dissipation

基于不可逆能量耗散的损伤变量定义方法和动态线粘弹性理论,建立了固体推进剂累积损伤模型,利用不同拉伸速率下的试验数据,拟合得到了推进剂破坏耗散能表达式,进而给出了推进剂在周期应力响应下的累积损伤计算式,并讨论了周期应力幅值和频率对累积损伤的影响,最后对某舰载发动机药柱进行了累积损伤及使用寿命分析。提出的累积损伤分析方法,为固体发动机贮存寿命预估提供了一条有益的技术途径。

A cumulative damage model of solid propellant was established based on energy dissipation damage variable defining method and dynamic linear viscoelastic theory. The expression of dissipated energy when destroyed was obtained according to the experimental data of different stretch rates, and the formula of cumulative damage for grain was presented as well. Considering influence of circular stress magnitude and frequency, the rule of cumulative damage varying was researched respectively, and a case of cumulative damage and life prediction for solid rocket motor grain was analyzed finally. The method is beneficial for the storage life prediction of solid rocket motor.