锥头弹体攻角贯穿薄钢靶数值模拟

Numerical Simulation of Thin Steel Target Perforated by Conical-Nosed Projectile with Yaw Angle

为了研究攻角对锥头弹体贯穿薄钢靶破坏模式和弹体偏转的影响,利用 ANSYS/LS-DYNA有限元软件建立了锥头弹体以 2°~10°攻角贯穿薄钢靶的模型。先验证了模型及参数的可靠性,在此基础上进行了锥头弹体在不同攻角和初始速度条件下的贯穿数值模拟。结合靶板的破坏与弹体的偏转过程提出了一种四阶段分析模型,并系统地研究了攻角对弹道和弹体偏转角变化规律的影响。结果表明:攻角贯穿薄钢靶失效模式为非对称花瓣形破坏;攻角越大,初始速度越小(大于弹道极限速度),弹道偏转越明显;弹体偏转角变化规律与初始速度范围相关,当初始速度高于 1.4 倍弹道极限时,弹体偏转角呈现先增大后减小的变化趋势;弹体出靶时刻的角速度随攻角的增大而增大,随着初始速度的增加先反向增大后减小。

Numerical simulations are conducted for perforation of conical projectile impacting on thin steel target with various yaw angles to investigate the influence of yaw angle. The finite element models of conical projectile impacting on thin steel target with yaw angle varying from 2° to 10° are established with the non-linear finite element code ANSYS/LS-DYNA. After the reliability of numerical simulations is verified, numerical simulations of conical projectile impacting on thin steel target with different yaw angles and initial velocities are carried out. A four-step model to analyze the process of projectile’s deflection is addressed by comparing the process of target’s failure and projectile’s deflection. At last, we discuss the projectile’s trajectory angel deflection and angular velocity through the validated numerical analysis. The results show that the failure of asymmetric petalling occurs when a thin plate is impacted by conical-nosed projectile with yaw angle. With the increase of the yaw angle and the decrease of initial velocity, the deflection of the trajectory will be more obvious;the deflection change of projectile relates to the initial velocity;the deflection angle shows a trend of increasing first and subsequently decreasing when the initial impact velocity is relatively high (greater than about 1.4 times the ballistic limit). When the projectile moves out of target, the angular velocity rises with the increase of the yaw angle, but it increases reversely and then reduces with the increase of initial velocity.