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Effect of Cover Plate on the Ballistic Performance of Ceramic Armor

机译：盖板对陶瓷盔甲弹道性能的影响

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摘要

The interface defeat and dwell can effectively improve the ballistic performance of ceramic armors under high velocity impact of long rod projectiles. Confinement conditions along both axial and radial directions of ceramic armors can affect these behaviors. With the aim of giving an insight into the effect of cover plate thickness and connection mode of cover plates with confining tubes on these behaviors, numerical simulations were performed in which the confined silicon carbide (SiC) targets with cover plates were impacted by tungsten rods. The pressure on the surfaces of SiC targets with fixed cover plates are compared to that with free cover plates, showing that the plates fixed with the confining tubes can produce higher pressure by way of wedging. With the increase in cover plate thickness, the dwell duration of the tungsten rods on the ceramic interface gradually grows. In addition, the upper and lower limits of transition impact velocities for the SiC targets with cover plates in different connection modes (i.e., free or fixed) were obtained and analyzed. The results show that the increase rate of the transition velocity region for the cover plate with the fixed-mode is relatively stable and lower than with the free-mode. On this basis, the fixed cover plate contributes higher ballistic performances to the SiC target than the free cover plate. It is also noteworthy that the size of transition velocity region does not enlarge linearly with the increase in cover plate thickness due to the slow growth of the upper limit. Accordingly, thickness thresholds exist, which are 5 mm and 6 mm for the fixed and free cover plates, respectively. Considering the ballistic performance and economy, the cover plate with the thickness ranging from 3 mm to 5 mm, i.e., 1.5~2.5 times of the tungsten rod diameter, is ideal for the structural dimensions in this paper.
机译：界面失败和停留可以在长杆射弹的高速冲击下有效提高陶瓷铠装的弹道性能。沿陶瓷铠装的轴向和径向的限制条件可能会影响这些行为。目的旨在对这些行为进行限制管的盖板厚度和盖板的连接模式进行了深入了解，进行了数值模拟，其中具有覆盖板的限制碳化硅（SiC）靶标受钨棒的影响。将固定盖板的SiC靶表面的压力与自由盖板进行比较，表明用限制管固定的板可以通过楔入产生更高的压力。随着盖板厚度的增加，陶瓷界面上的钨棒的居住持续时间逐渐增长。另外，获得并分析了不同连接模式（即自由或固定）的盖板的过渡冲击速度的过渡冲击速度的上限和下限。结果表明，具有固定模式的盖板的过渡速度区域的增加速率相对稳定，低于自由模式。在此基础上，固定盖板对SiC靶表示比自由盖板更高的弹道性能。还值得注意的是，由于上限的缓慢增长，过渡速度区域的尺寸不会随着覆盖板厚度的增加而被直线扩大。因此，存在厚度阈值，其分别为固定和自由盖板为5mm和6mm。考虑到弹道性能和经济，厚度范围为3毫米至5mm的盖板，即钨棒直径的1.5〜2.5倍，是本文结构尺寸的理想选择。

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