身管内膛热化学-机械烧蚀磨损数值计算

Numerical Calculation of Thermochemical-Mechanical Erosion on the Barrel Chamber

目的探究身管烧蚀和机械磨损的作用机理,完善身管热化学–机械烧蚀磨损模型,指导身管寿命预测和结构设计。方法以弹炮耦合系统摩擦行为为切入点,提出一种计及摩擦热的热化学烧蚀材料退化模型。基于Archard磨损理论和动压润滑原理,以动压润滑摩擦替换传统弹炮耦合过程采用的干摩擦,提出一种身管机械磨损材料退化模型。结果身管内膛烧蚀磨损主要集中在坡膛和炮口位置,500发射击后坡膛位置最大径向、周向烧蚀量分别为1.3、0.8 mm,炮口位置最大径向、周向机械磨损量分别为0.32、0.26 mm。结论材料退化模型能够较为准确地描述弹炮耦合系统中身管内膛的烧蚀磨损特性。数值模拟结果与实际膛线烧蚀磨损具备较好的一致性。

The paper aims to explore the mechanism of barrel erosion and wear,improve the thermochemical-mechanical erosion and wear model,and guide life prediction and structural design of artillery barrel.In this paper,a thermal chemical erosion model considering frictional heat is proposed based on the friction behavior of the projectile-barrel coupling system.The HDL friction is used to replace the dry friction based on the Archard wear theory and the principle of HDL,and mechanical wear model is proposed.Numerical calculations are carried out on the derived erosion and wear model.The erosion and wear of the chamber in the barrel is mainly concentrated in the position of the forcing cone and muzzle.The maximum radial and circumferential erosion of the bullet forcing cone after 500 shots are 1.3 mm and 0.8 mm,the maximum radial and circumferential wear of the muzzle are 0.32 mm and 0.26 mm.The results show that the erosion and wear model can more accurately describe the material degradation of the chamber.The numerical simulation results are in good agreement with the actual rifling erosion and wear.