结构间隙对芳纶纤维增强复合装甲结构抗侵彻性能的影响

采用由5 mm厚的前置钢板、60 kg/m~2面密度的芳纶纤维增强复合材料层合板抗弹芯层、10 mm厚的后置钢板构成的夹芯式复合装甲结构,模拟舰船舷侧复合夹芯舱壁结构。根据面板与芯层间有无50 mm的间隙,将复合装甲结构分为无间隙式、后间隙式、前后间隙式3种结构型式。开展了复合装甲结构在质量40 g、最高初速约为1 630 m/s的高速圆柱体弹丸冲击下的抗侵彻性能实验,提出了钢质面板和芳纶纤维增强复合材料层合板芯层的破坏模式,研究了复合装甲结构的抗侵彻机理,对比分析了同一穿甲载荷冲击下3种复合装甲结构的抗弹性能。结果表明:前置面板的破坏模式主要为剪切冲塞;面板与芯层之间的间隙对芳纶纤维增强复合材料板的破坏模式及钢质背板的变形量影响较大、对前置面板影响较小;同一穿甲载荷冲击下,间距的存在有利于复合装甲结构综合抗侵彻性能的提高。

Influence of Structural Interspace on Anti-penetration Performance of Para-aramid Fiber-reinforced Composite Armor System

Three different composite armor systems with 50 mm width or no interspace between different parts were designed to simulate sandwich bulkhead,in which 5 mm-thick steel plate and 10 mm-thick steel plate are used as front and back plates,respectively,and the para-aramid fiber-reinforced plate (AFRP) with areal density of about 60 kg/m2 is used as sandwich core.Ballistic experiments are carried out to study the anti-penetration performance of the three para-aramid fiber-reinforced composite armor systems subjected to normal impact by 40 g cylindrical fragments at about 1 630 m/s.The failure modes of surface plate and sandwich core of the composite armor system are presented,the anti-penetration mechanisms of the composite armor systems are analyzed,and the anti-penetration performances of the three composite armor systems are compared.The experimental results show that interspace between different parts has significant effect on the failure modes of AFRP and anti-penetration performance of composite armor system.