氧化锌改性芳纶织物的抗弹道冲击性能的数值模拟

Numerical Investigation of Anti-ballistic Property of ZnO-modified Aramid Fabrics

芳纶织物由于其低密度、高模量、高强度特性被广泛应用于人体防弹领域,为提高芳纶织物的抗弹性能,通过纳米氧化锌颗粒种植生长对芳纶织物进行改性,开展电镜观察、准静态拉伸试验、纱线拉拔试验、弹道冲击试验和数值模拟工作,得到了氧化锌改性织物的力学性能和弹道性能。研究结果表明:氧化锌颗粒的种植增加了纤维之间的结构互锁与表面粗糙度,氧化锌改性织物的纱线间摩擦系数较纯织物提高了282%,弹道极限速度较纯织物提高了54.5%,且吸能与比吸能性能显著优于纯织物;通过细观纱线模型对织物的弹道冲击过程进行模拟,仿真结果与弹道试验结果具有良好的一致性,进一步说明了纱线间摩擦系数和拉伸强度的提升可以作为提高织物的抗弹道冲击性能的有效手段,为氧化锌改性织物在柔性防弹领域的应用提供了理论依据。

Aramid fabrics are widely used in the field of body armors due to their low density,high modulus and high strength.In order to improve the ballistic resistance of aramid fabrics,the aramid fabrics are modified by planting and growing the nano-ZnO particles.The electron microscope observation,quasi-static tensile test,yarn pull-out test,ballistic impact test and numerical simulation were made for ZnO-modified fabrics,and their mechanical and ballistic properties were studied.The results show that the planting of ZnO particles increases the structural interlock and surface roughness of yarns.Compared with the neat fabrics,the inter-yarn friction coefficient of ZnO-modified fabrics is increased by 282%,their ballistic limit velocity is increased by 54.5%,and their energy absorption and specific energy absorption performance are significantly better than those of neat fabrics.The ballistic impact process of the modified fabric is simulated by the meso-yarn model.The simulated results are in good agreement with the ballistic test results.This further explains that the improvement of inter-yarn friction coefficient and tensile strength is an effective means to enhance the ballistic impact resistance of fabrics,and provides a theoretical basis for the application of ZnO-modified fabrics in the field of flexible bulletproof.