圆柱形钨破片撞击铝靶时的跳飞临界角

采用理论计算、数值模拟与实验相结合的方法，研究了直径5.7 mm、长6.7 mm的圆柱形破片以800~1 200 m/s的速度撞击2~10 mm厚铝靶时的跳飞特性。建立了破片斜侵彻有限厚靶板的跳飞临界角理论模型，计算得到破片跳飞临界角与破片入射速度、靶板厚度的关系，并与模拟值、实验值对比，三者吻合较好。结果表明:破片撞靶速度相同时，随着靶板厚度的增加，破片的跳飞临界角减小。靶板厚度相同的情况下，在所计算的速度范围内，入射速度越大，破片跳飞临界角越大。速度在800~1 200 m/s时，破片撞击2 mm厚靶板的跳飞临界角为81°~81.25°；撞击4 mm厚靶板的跳飞临界角为72.5°~76.25°。

Critical ricochet angle of cylindrical tungsten fragment impacting aluminum target

In the present study, we performed theoretical calculation, numerical simulation and experimental test to investigate the ricochet performance of cylindrical fragments. The fragment, 5.7 mm in diameter and 6.7 mm in length, impacted aluminum plates 2-10 mm in thickness at speeds of 800-1 200 m/s. A theoretical model of the ricochet was established, the relation between the critical angle and the initial velocity and the thickness of the target plate were obtained. The results of theoretical calculation agreed well with both the simulation and experiment. The results show that the higher the impacting velocity, the larger the critical ricochet angle; and the thicker the target, the smaller the critical ricochet angle. When a fragment impacts a 2 mm target plate at 800-1 200 m/s, the critical ricochet angle is 81°-81.25°; when a fragment impacts a 4 mm target plate at 800-1 200 m/s, the critical ricochet angle is72.5°-76.25°.