三维增强体结构对STF-UHMWPE柔性复合材料防刺性能的影响

Effect of three-dimensional reinforcement structure on puncture resistance of STF-UHMWPE flexible composite

摘要

基于三维角联锁织物的结构稳定性和纤维间的贯穿连接性,通过剪切增稠液(STF)浸渍处理超高分子量聚乙烯(UHMWPE)角联锁织物,系统揭示结经纱贯穿深度与STF协同作用对复合材料防刺性能的影响机制。结果表明,STF与UHMWPE基体的耦合效应和接结经纱贯穿深度的增加,可显著提升纱线间的摩擦因数和界面相互作用力。当贯穿深度为5层时,柔性复合材料的纱线最大抽拔载荷是同参数纯织物的9.1倍。在400 mm/min的穿刺速度下,贯穿深度为5层的柔性复合材料同样表现出优异的防刺性能,其最大峰值载荷是贯穿深度为2层的复合材料的1.45倍。贯穿深度与STF剪切增稠效应的协同作用,促使纱线间形成稳定的三维互锁结构,从而抑制层间滑移。提出三维增强体结构和STF液体耦合双模式,协同提升柔性复合材料的防刺性能。

Abstract

Based on the structural stability of three-dimensional angle-interlocking fabrics and the penetration connection between fibers, ultra-high molecular weight polyethylene (UHMWPE) angle-interlocking fabrics were impregnated with shear thickening fluid (STF). This study systematically reveals the influence mechanism of the synergistic effect of the penetration depth of the binding warp yarns and STF on the stab resistance performance of the composite materials. The research results show that the coupling effect between STF and UHMWPE matrix and the increase in the penetration depth of the binding warp yarns can significantly enhance the friction coefficient and interfacial interaction force between the yarns. When the penetration depth reaches 5 layers, the maximum pull-out load of the yarn in the flexible composite material is 9.1 times that of the neat fabric with the same parameters. At a puncture speed of 400 mm/min, the flexible composite material with a penetration depth of 5 layers also exhibits excellent anti-performance, with its maximum peak load being 1.45 times that of the composite material with a penetration depth of 2 layers. This synergy between STF’s shear-thickening behavior and yarn penetration depth stabilizes the 3D interlocking structure, effectively mitigating interlayer slippage. A three-dimensional reinforcement structure and an STF liquid-coupled dual mode are proposed to synergistically improve the stab resistance of the flexible composite materials.

关键词

三维角联锁织物增强结构 / 柔性复合材料 / 剪切增稠液(STF) / 接结经纱贯穿深度 / 防刺性能 / 基体耦合

Key words

three-dimensional structure / flexible composite / shear thickening fluid (STF) / binding warp / stab resistance / matrix coupling

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基金资助

国家自然科学基金青年科学基金项目(12202133)

河北省自然科学基金面上项目(A2024208001)