High-performance and lightweight ballistic composites prepared through layer-by-layer lay-up of matrix and fabric have attracted significant interest. However, the traditional full-coverage lay-up design constrains the energy absorption of the composites during ballistic impact. Therefore, novel ballistic composites configured with checkerboard-shaped lay-up design were studied, using checkerboard-shaped polycarbonate (PC) films and aramid plain-woven fabrics. The effect of the size and cross-layered distribution of the checkerboard-shaped PC films was investigated. Compared with the full-coverage lay-up design, the checkerboard-shaped lay-up design can effectively improve the ballistic performances. For checkerboard-shaped lay-up design ballistic composites, the ballistic performances exhibited minor variation when impacting PC regions but gradually increased with the size of the fabric regions when impacting aramid fabric regions. The ballistic performances of interval cross-layered checkerboard-shaped PC films also increased with the number of interval layers. When impacting PC regions, the primary ballistic mechanisms were compression/shear and shear/tensile failures; however, when delamination and stress waves propagated into the regions without PC films, the checkerboard lay-up design allowing for effective energy absorption through tensile failure by fabrics. When impacting aramid fabric regions, the primary ballistic mechanisms were shear/tensile failure and tensile failure. However, when the size of aramid fabric region was insufficient, the near PC region can restrict transverse deformation of the fabrics, which did not benefit the ballistic performances.

中文翻译：

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采用棋盘形叠层设计的新型防弹复合材料的研究和制造，以提高防弹性能

通过基体和织物逐层铺设制备的高性能轻质防弹复合材料引起了人们的极大兴趣。然而，传统的全覆盖铺层设计限制了复合材料在弹道冲击过程中的能量吸收。因此，研究人员使用棋盘形聚碳酸酯（PC）薄膜和芳纶平纹织物，研究了采用棋盘形叠层设计配置的新型防弹复合材料。研究了棋盘形PC薄膜的尺寸和交叉层分布的影响。与全覆盖叠层设计相比，棋盘形叠层设计可以有效提高弹道性能。对于棋盘形叠层设计的防弹复合材料，当冲击PC区域时，弹道性能表现出较小的变化，但当冲击芳纶织物区域时，弹道性能随着织物区域的尺寸而逐渐增加。间隔交叉分层棋盘形PC薄膜的防弹性能也随着间隔层数的增加而提高。当撞击 PC 区域时，主要的弹道机制是压缩/剪切和剪切/拉伸破坏；然而，当分层和应力波传播到没有 PC 薄膜的区域时，棋盘叠层设计可以通过织物的拉伸破坏来有效吸收能量。当冲击芳纶织物区域时，主要弹道机制是剪切/拉伸破坏和拉伸破坏。然而，当芳纶织物区域尺寸不足时，近PC区域会限制织物的横向变形，这不利于防弹性能。