高温引起的弹头壳铜被甲材料性能变化对弹头膛内运动影响

为了研究高温下铜被甲弹头在膛内运动状况，通过高温拉伸试验得到枪管材料和弹头壳铜被甲材料的力学性能参数，建立了铜被甲弹头在全枪管中的挤进运动有限元模型。该模型考虑了枪管在重力作用下的预弯曲以及铜被甲材料在不同温度时的力学性能。通过数值模拟研究了弹头挤进过程以及弹头在膛内运动姿态，分析了铜被甲弹头在不同温度下的挤进阻力、材料流动及变形。计算结果表明，温度越高，弹头在膛内变形越大，前进阻力也越大，弹头头部铜被甲弯曲程度越厉害；对弹头运动姿态进行分析后发现，温度越高，弹头在膛内摆动角越大，说明了热枪状态下铜被甲弹头的射击精度会下降，射弹散布变大。

An Analysis of Motion of Projectile in Bore with the Change of Material Properties of Copper Armor due to High Temperature

A finite element model of projectile and barrel is established to study the motion of projectile in bore at high temperature, in which the pre-bending of barrel under gravity and the mechanical properties of copper armor at different temperatures are considered. The engraving process of projectile and its motion attitude in bore are studied through numerical simulation, and the engraving resistance, material flow and deformation of projectile at different temperatures are analyzed. The mechanical properties of barrel and copper armor were obtained through high temperature tensile tests, and the processes of projectile entering into the barrel at different temperatures are analyzed. The results show that the higher the temperature is, the greater the stress, strain, deformation and swing angle of projectile will be.