Abstract

In recent times, auxetic woven structures gained considerable attention from the researchers due to their excellent impact properties in high-performance areas. Researchers have done much work on the auxetic behavior of the natural and low-performance yarns in two-dimensional structures. Keeping in view the structural application of auxetic structures, in this work, three-dimensional (3D) woven auxetic fabrics were developed on conventional weaving machines with high-performance yarns. Effect of high-performance yarns (Para-aramid and UHMWPE) as the main structure and binding threads on the auxeticity of 3D fabric structures and the impact properties of their corresponding composites were discussed. For this purpose, eight different orthogonal 3D woven structures were produced with para-aramid filament yarn as warp and weft, whereas ultra-high molecular weight polyethylene (UHMWPE) filament yarn was used as a binder. The tensile load was applied to the 3D fabrics to check their auxeticity, and a change in thickness was recorded. The results showed that as the float length of binder yarn and warp yarn increases with the equal and same ratio, the auxeticity also increases. While auxeticity decreases as the difference between the float length of binder yarn and warp yarn increases. The Negative Poisson's Ratio (NPR) of 3D woven fabrics ranged from −0.9 to −2.98. In the second step, these 3D woven fabrics were fabricated into their composites using unsaturated polyester resin, and the hand-layup technique. Their impact strength was measured using the Charpy test method. Auxetic woven composites made of high-performance yarns structures showed impact strength ranging from 55.64 kJ/m² to 158.46 kJ/m².

• Highlights

• High-performance yarns (Para-aramid and Ultra-high molecular weight polyethylene) were used to create eight 3D woven and composite samples with enhanced auxetic behavior.

• The result shows that samples having maximum binding yarn float length and fewer intersection points show maximum auxeticity and increased energy absorption.

• The maximum auxeticity and impact energy absorption obtained was -2.98 and 158.46 kJ/m^2, respectively.

• The current research has applications in protective textiles and bulletproof composite panels.

摘要

近年来，拉胀编织结构因其在高性能领域的出色冲击性能而受到研究人员的广泛关注。研究人员对二维结构中天然和低性能纱线的拉胀行为做了大量工作。考虑到拉胀结构的结构应用，在这项工作中，三维（3D）编织拉胀织物是在具有高性能纱线的传统织机上开发的。讨论了高性能纱线（对位芳纶和 UHMWPE）作为主要结构和结合线对 3D 织物结构的拉胀性及其相应复合材料的冲击性能的影响。为此，我们使用对位芳纶长丝纱作为经纬纱制作了八种不同的正交 3D 编织结构，而超高分子量聚乙烯（UHMWPE）长丝纱用作粘合剂。将拉伸载荷施加到 3D 织物上以检查其拉胀性，并记录厚度变化。结果表明，随着接结纱和经纱的浮线长度以等比相同的比例增加，拉胀度也随之增加。而拉胀度随着接结纱和经纱浮纱长度差的增加而降低。3D 机织织物的负泊松比 (NPR) 范围从 -0.9 到 -2.98。第二步，使用不饱和聚酯树脂和手糊技术将这些 3D 机织织物制成复合材料。它们的冲击强度使用夏比试验方法测量。²至 158.46 kJ/m ²。

• 强调

• 高性能纱线（对位芳纶和超高分子量聚乙烯）用于制造八个具有增强拉胀性能的 3D 编织和复合样品。

• 结果表明，具有最大结合纱线浮线长度和较少交叉点的样品显示出最大的拉胀性和增加的能量吸收。

• 获得的最大拉胀性和冲击能量吸收分别为-2.98 和158.46 kJ/m ²。

• 目前的研究已应用于防护纺织品和防弹复合板。