基于裂纹形成及扩展的火炮闩体寿命研究  

Research on Gun Breechblock Life Based Crack Formation and Propagation

作　　者：李魁武[1] 宁变芳[1] 曾志银[1] 王在森[1] 张军岭[1] 

机构地区：[1]西北机电工程研究所,陕西咸阳712099

出　　处：《兵工学报》2013年第3期289-293,共5页Acta Armamentarii

摘　　要：某自动武器定型试验实弹射击累计523发时,静检发现闩体出现约1 mm深裂纹,为了判定损伤闩体剩余寿命是否满足使用要求,应用解析与数值模拟方法,对闩体裂纹形成阶段的寿命和扩展阶段的寿命进行了分析计算。结果表明,在常温正装药条件下,考虑闩体实际加工表面粗糙度对疲劳寿命的影响,计算总体寿命不小于1 650发,可满足闩体的设计要求。同时,对闩体疲劳裂纹形成的影响因素进行了分析,根据分析计算结果,采取了减小闩体局部表面粗糙度措施,使该火炮闩体寿命提高到1 800发以上。Some automatic weapon breechblock formed 1 mm depth crack after firing of 523 rounds during the finalized test. In order to estimate whether the residual life satisfies the requirements for the use of the breechblock, the crack formation and propagation life has been studied using analytical and numerical method. Considering the effect of the roughness level, the fatigue life is no less than 1 650 rounds under the conditions of normal temperature and standard charge. It is greater than the design target. Based on the simulation result, we analyzed the influence factors of the breechblock fatigue crack formation life and took the measures to reduce the breechblock roughness level. The breechblock fatigue life has been enhanced to more than 1 800 rounds.

关 键 词：兵器科学与技术 闩体 疲劳裂纹 疲劳裂纹形成寿命 疲劳裂纹扩展寿命 

分 类 号：TJ301[兵器科学与技术—火炮、自动武器与弹药工程]