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针对固体火箭发动机在舰船运动影响下损伤难以评估的问题,以某固体火箭发动机为例,建立了摇摆载荷作用下发动机药柱粘接界面的疲劳损伤评估方法。通过推进剂粘接界面定应力往复剪切试验获得了其粘接界面的疲劳损伤特性;利用有限元分析方法计算得到了发动机界面剪切应力较大部位的应力谱;运用雨流计数法和Miner线性累积损伤原理对发动机粘接界面的疲劳损伤进行了评估。试验与仿真结果表明,推进剂粘接界面应力幅值和疲劳破坏次数的自然对数满足指数型方程,并且在给定舰载条件下发动机海上战备值班一年的寿命比仓库贮存时至少降低8.62%.
Aiming at the problem that the solid rocket motor is hard to be evaluated under the influence of ship motion, a solid rocket motor is taken as an example to establish a fatigue damage assessment method for the interface of the engine oil cylinder under rocking load. Through the finite element analysis method, the stress spectrum of the larger part of the interface of the engine was obtained by using the method of rain flow counting and Miner The principle of linear cumulative damage has been used to evaluate the fatigue damage of engine bonding interface. The experimental and simulation results show that the natural logarithm of the stress amplitude and the number of fatigue damage at the interface of propellants satisfy the exponential equation and the life expectancy of one year on the sea level of the engine at a given shipborne condition is reduced by at least 8.62 %.