中口径多环境枪弹致伤效应研究OA北大核心CSTPCD

To investigate the wound effectiveness of cross-medium bullets,gelatin is chosen as a simulated human target.The numerical simulation of the penetration process of the designed 7.62 mm multi-environment bullet into the simulated target is conducted using LS-DYNA software.The motion of the bullet and the changes in the target cavity are analyzed.By utilizing a three-degree-of-freedom rigid body motion model,the theoretical variations of bullet motion are obtained.In the same time,the penetration experiment was carried out by using multi-parameter synchronous measurement techniques.The results show that the numerical simulation agrees well with the experimental observations,effectively reproducing the penetration process and the wound effects of the multi-environment bullet.The theoretical model exhibits small errors compared to the experimental results but accurately predicts the motion characteristics of the bullet in the target.By employing a cavity structure,the stability of the bullet's motion across different media is improved.Compared to the traditional 56-type 7.62 mm rifle bullet,the designed bullet demonstrates longer stable flight time,greater distance,slower velocity decay,smaller deflection angle during tumbling phase,and comparable maximum cavity,permanent cavity,and energy transfer efficiency.It also exhibits a certain killing effect on the target.The research findings enrich the design theory of bullets and provide data support for the optimization design of new lightweight ammunition.