基于三维FE-SPH自适应耦合算法的子弹侵彻混凝土靶跳飞问题模拟

NUMERICAL SIMULATION OF RICOCHET PROBLEM OF PROJECTILE PENETRATING INTO CONCRETE TARGET BASED ON 3D FE-SPH ADAPTIVE COUPLING ALGORITHM

利用三维FE-SPH自适应耦合算法对子弹斜侵彻混凝土靶时的跳飞现象进行了数值模拟。提取了跳飞过程中子弹的线性速率、加速度、角动量和转动力矩随时间的变化曲线,对子弹跳飞过程及产生的原因进行了分析。结果表明,混凝土靶作用于子弹的不对称阻力所产生的力矩是子弹跳飞的根本原因。在以上分析的基础上,该文研究了子弹初始速度、入射倾角以及靶板厚度等条件对跳飞的影响规律,取得了一些定量的结果。

The phenomenon of ricochet of projectile adaptive coupling algorithm. Based on the time curve moment of the ricochet process extracted from the penetrating into concrete target is simulated by 3D FE-SPH of velocity, acceleration, angular momentum and rotational numerical results, the process and cause of ricochet are analyzed. The results show that rotational moment caused by asymmetric resistance of concrete target exerting on projectile is the essential reason of ricochet. In view of the above analysis, some useful conclusions are drawn, such as the law of ricochet under different initial velocities, oblique angles and target thickness.