Antipenetration performance of honeycomb shelter under two repeat projectile strikes is investigated via test and numerical simulation. Among them, there are two kinds of test targets: cylindrical honeycomb structure target and reinforced concrete target; a numerical simulation target is a honeycomb-structure target composed of hexagonal honeycomb unit, and the size of the target is the same as that of the honeycomb-structure target in test. The results show that the damage area of the honeycomb-structure target is smaller than that of the reinforced concrete target under projectile strikes with approximately the same velocity. The damage range of the honeycomb-structure target is limited within the hexagonal cell getting contact with projectile left other cells with no damage. During the two repeat projectile strikes, the first projectile will deflect to some extent just as single projectile strike. The deflection of the second projectile is larger and is related to the distance between the strike points of the two projectiles. The results show that honeycomb shelter performs good under two repeat projectile strikes.

中文翻译：

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两次重复弹丸打击下蜂窝格架的抗渗透性能

通过试验和数值模拟研究了蜂窝掩体在两次重复弹丸撞击下的抗渗透性能。其中，有两种测试靶：圆柱形蜂窝结构靶和钢筋混凝土靶。数值模拟目标是由六边形蜂窝单元构成的蜂窝结构目标，其尺寸与试验中的蜂窝结构目标相同。结果表明，在近似相同速度下，在弹丸打击下，蜂窝结构靶的损伤面积小于钢筋混凝土靶的损伤面积。蜂窝状结构靶的损伤范围被限制在六角形单元与弹丸接触而没有其他单元的情况下。在两次重复的弹丸打击中，第一个弹丸将在一定程度上偏转，就像单个弹丸打击一样。第二弹丸的偏转较大，并且与两个弹丸的打击点之间的距离有关。结果表明，蜂窝掩体在两次重复的弹丸撞击下表现良好。