基于铬层与基体结合部疲劳损伤的转管机枪身管寿命预测研究

为预测身管寿命，采用热-固耦合场理论、冲击疲劳理论和疲劳累积损伤理论，提出基于身管铬层与基体结合部疲劳损伤的身管寿命预测方法。以3管转管机枪的身管寿命为例，建立有限元模型，计算铬层与基体结合面的耦合应力，预测身管寿命，理论计算与试验结果进行了对比，数据基本吻合；分析身管镀铬层厚度对身管寿命的影响。研究结果表明：铬层与基体结合部的疲劳损伤寿命基本决定了身管的寿命，证明所提寿命预测方法是可行的；适当增加镀铬层厚度，可以提高身管寿命。

Barrel Life Prediction of Rotating Barrels Machine Gun Based on Fatigue Damage of Chromium-steel Interface

To predict the life of a gun barrel, the theories of thermal-solid coupled stress, the impact fatigue and fatigue cumulative damage are used to derive the life prediction of a gun barrel based on fatigue damage of chromium-steel interface. A 3D finite element model for a 3-barrels rotating machine gun is built to calculate the coupling stress of chromium-steel interface. The barrel life of the rotating barrels machine gun is estimated. The estimated result is basically consistent with the experimental result. The analysis results show that the fatigue damage life at chromium-steel interface almost determines the life of the gun barrel. The effect of the thickness of chromium coating on the life of gun barrel is studied. The research result shows that the life of gun barrel can be improved by increasing the thickness of chromium coating properly.