Abstract Composites based on aramid fibres are widely used to protect people and vehicles from high-velocity impact threats. Currently, quite a lot of attention is paid to methods for increasing the efficiency of such structures without a significant increase in areal density. The article demonstrates the results of experimental and computational studies of two types of multilayer fabric systems based on Twaron® 709. The first system consisted of dry fabric layers, and the second one was based on the fabric layers with polyvinyl acetate (PVA) surface coating. Experimental studies included quasi-static yarn pull-out tests, high-velocity impact tests of specimens without backing support, and tests on a plasticine block to assess the back face bulging. The results of the experiments showed that thin coatings of PVA contributed to a significant pull-out force increase due to polymer connections between the yarns. This effect led to the fact that specimens based on coated fabrics had a ballistic limit twice as much and showed a three-fold decrease in the depth of the dent on plasticine in comparison with dry fabrics. The total increase in surface density did not exceed 6% while maintaining high flexibility of the package. Also, numerical simulations were used to confirm the results of experiments. It was shown that mesoscale yarn-level models allow to predict plasticine indentation depths of the dry and coated multilayer fabric targets.

中文翻译：

---

表面聚合物涂层对多层织物复合材料弹道冲击响应的影响：实验和数值研究

摘要 基于芳纶纤维的复合材料被广泛用于保护人和车辆免受高速撞击威胁。目前，在不显着增加面密度的情况下提高这种结构的效率的方法受到了相当多的关注。本文展示了基于 Twaron® 709 的两种多层织物系统的实验和计算研究结果。第一个系统由干织物层组成，第二个系统基于具有聚醋酸乙烯酯 (PVA) 表面涂层的织物层. 实验研究包括准静态纱线拔出试验、无背衬支撑的试样高速冲击试验，以及用橡皮泥块进行的试验，以评估背面鼓胀。实验结果表明，由于纱线之间的聚合物连接，PVA 的薄涂层有助于显着增加拉拔力。这种效果导致这样一个事实，即基于涂层织物的试样的弹道极限是干织物的两倍，橡皮泥上的凹痕深度比干织物减少了三倍。在保持包装的高柔韧性的同时，表面密度的总增加不超过 6%。此外，还使用数值模拟来确认实验结果。结果表明，中尺度纱线级模型可以预测干燥和涂层多层织物目标的橡皮泥压痕深度。这种效果导致这样一个事实，即基于涂层织物的试样的弹道极限是干织物的两倍，橡皮泥上的凹痕深度比干织物减少了三倍。在保持包装的高柔韧性的同时，表面密度的总增加不超过 6%。此外，还使用数值模拟来确认实验结果。结果表明，中尺度纱线级模型可以预测干燥和涂层多层织物目标的橡皮泥压痕深度。这种效果导致这样一个事实，即基于涂层织物的试样的弹道极限是干织物的两倍，橡皮泥上的凹痕深度比干织物减少了三倍。在保持包装的高柔韧性的同时，表面密度的总增加不超过 6%。此外，还使用数值模拟来确认实验结果。结果表明，中尺度纱线级模型可以预测干燥和涂层多层织物目标的橡皮泥压痕深度。