内能式转管舰炮活塞杆断裂原因计算分析

Calculation and analysis of the fracture of piston rod of internal energy transfer pipe

以试验中某内能式转管舰炮活塞杆断裂出发,通过分析内能式转管舰炮的结构原理,建立该活塞杆断裂原因分析的故障树。首先排除了自动机卡滞、供弹系统卡滞及零件生产加工不合格等因素,只剩疲劳寿命不足及异物卡滞两因素待确定。通过理论计算得到活塞杆在工况下的脉冲载荷,通过计算编辑得到活塞杆材料疲劳寿命S-N曲线,并建立了活塞杆在载荷工况下的强度分析,最后基于Design Life疲劳寿命软件分析平台,预测了活塞在工况下的循环寿命为14 880次,高于设计循环寿命的1.5倍多,结合断裂活塞理化分析结果排除了设计寿命不足因素。最终确定主要原因为异物卡滞。此活塞杆断裂原因分析过程中采用的分析思路、仿真手段、实验方法对工程同类问题分析具有一定的参考价值。

The piston rod fracture of an internal energy transfer pipe was broken, by analzing the structure principle of internal energy transfer weapon, the fault tree of the fault analysis of the piston rod was established. First, it excludes the factors such as the self-motivation card delay, the lag of the ammunition system and the unqualified production and processing of the parts, only the fatigue life is insufficient and the foreign body card delay two factors to be determined. The impulse load of piston rod under working condition is calculated by theory, the fatigue life S-N curve of piston rod was obtained by calculation, the strength analysis of piston rod under load condition is established, finally, based on the fatigue life software analysis platform of designlife, the cycle life of piston under working condition is predicted to be 14 880, more than1.5 times the design cycle life, based on the results of physical and chemical analysis of fractured piston, the design life factor was eliminated. finally, the main reason is the foreign body lag. The analysis method、simulation method and experimental method used in the analysis of the fault cause of the piston rod have certain reference value to the analysis of similar problems in engineering.