基于裂纹形成及扩展的火炮闩体寿命研究

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。

Research on Gun Breechblock Life Based Crack Formation and Propagation

Some automatic weapon breechblock formed 1mm 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 en- hanced to more than 1 800 rounds.