Abstract

The individual influence of target dynamics, curvature, bio-inspired (Pangolin’s scale) surface pattern, and presence of external (‘V’-shaped) and spaced internal grooves (‘M’-shaped) on ballistic performance of lightweight aluminum (6061-T6) target has been investigated. Target thickness of 10 mm and an armor piercing projectile of 9 mm diameter, 7.85 g weight were considered for the numerical simulation. The initial impact velocity of the projectile was varied in the range of 400 to 800 m/s. Compared to the static target, the exit velocity of the projectile was observed to be less (2.3%) for the dynamic target. When the target is moving, it significantly alters the penetration direction and increases the travel length of the projectile. When the ‘α’ of the target was increased (5 mm to 8 mm), significant improvement (3.63%) in ballistic performance was noted. Among the several conditions simulated, when the curved target received the projectile’s impact at an offset distance (35 mm) from the center of the target showed a better performance (up to 10.7%). In addition an angular deflection (–5.1°) of the projectile from the center of the target was noted. Compared to curved targets, increased angular deflection (35°) of the projectile was observed for target having bio-inspired (pangolin’s scale) pattern. This is due to cantilever action offered by the scaled pattern. Even though the presence of V-notch pattern could able to resist the projectile’s impact, the ballistic resistance was observed to be marginal due to higher stress concentration at the notch root region. Compared to all other cases, the spaced internal grooves (‘M’ shape) inside the target, enhanced the ballistic resistance (72%) for groove dimensions of pitch and width of 3.5 mm and 0.5 mm.

摘要

目标动力学、曲率、仿生（穿山甲鳞片）表面图案以及外部（“V”形）和间隔内部凹槽（“M”形）的存在对轻质铝材（6061-）弹道性能的个体影响T6) 目标已被调查。数值模拟考虑了 10 毫米的目标厚度和 9 毫米直径、7.85 克重量的穿甲弹。弹丸的初始冲击速度在 400 至 800 m/s 范围内变化。与静态目标相比，动态目标观察到弹丸的出口速度较小（2.3%）。当目标移动时，它会显着改变穿透方向并增加弹丸的行进长度。当目标的“α”增加（5 mm 至 8 mm）时，显着改善（3. 63%) 的弹道性能被注意到。在模拟的几种情况中，当弯曲目标在距目标中心偏移距离（35 mm）处受到弹丸的撞击时表现出更好的性能（高达10.7%）。此外，注意到射弹从目标中心的角度偏转（–5.1°）。与弯曲目标相比，对于具有仿生（穿山甲鳞片）图案的目标，观察到弹丸的角偏转（35°）增加。这是由于缩放模式提供的悬臂作用。尽管 V 型缺口图案的存在能够抵抗弹丸的冲击，但由于缺口根部区域的应力集中度较高，因此观察到弹道阻力很小。与所有其他情况相比，目标内部的间隔内部凹槽（“M”形），