Abstract Confined silicon carbide (SiC) plates covered with aluminium alloy, mild steel, and copper alloy materials of different elastic impedances were subjected to normal impact by blunt tungsten-heavy-alloy projectile of 16 mm diameter and 40 mm length, at a nominal striking velocity of 1.25 km/s. Failure analysis of the armour modules and penetration weight calculated by the measured residual penetration were applied to characterize ballistic performance of the ceramic armour modules. A simulation calculation was employed to investigate the inner impact process and the results corresponded well with the experimental ones. The damage initiation and propagation in ceramic, and the stress field distribution in the projectile were presented and analysed. The results showed that the cover plate can effectively reduce the damage of the target due to the extension of a dwell period compared with a ‘no cover’ structure. Low- elastic impedance material covers promote the impact stress distribution in ceramic leading to great improvement in ceramic ballistic performance. Moreover, the effect of cover material properties and energy dissipation at different impact periods was discussed.

中文翻译：

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金属盖板对碳化硅大型钨弹弹道性能的影响

摘要 不同弹性阻抗的铝合金、低碳钢和铜合金材料包覆的碳化硅（SiC）板受到直径 16 mm、长 40 mm 的钝头钨重合金弹丸的法向冲击，标称撞击速度为 1.25 公里/秒。装甲模块的失效分析和通过测量的剩余穿透计算的穿透重量被应用于表征陶瓷装甲模块的弹道性能。采用模拟计算研究了内部撞击过程，结果与实验结果吻合良好。介绍并分析了陶瓷中损伤的发生和扩展，以及弹体中的应力场分布。结果表明，与“无盖”结构相比，盖板可有效减少因驻留期延长而对目标造成的损坏。低弹性阻抗材料覆盖层促进了陶瓷中的冲击应力分布，从而大大提高了陶瓷的防弹性能。此外，还讨论了不同冲击周期下覆盖材料特性和能量耗散的影响。