The variation in Poisson's ratio caused by interactions between core and wrap in helical composite auxetic yarns
The variation in Poisson's ratio caused by interactions between core and wrap in helical composite auxetic yarns
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DOI：
10.1016/j.compscitech.2014.07.023
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发表时间：
2014-10-06
影响因子：
9.1
通讯作者：
Evans, K. E.
中科院分区：
文献类型：
--
作者：
Bhattacharya, S.;Zhang, G. H.;Evans, K. E.
具有负泊松比的材料被称为拉胀材料。最近发明的一个例子是螺旋拉胀纱线（HAY）。这已被证明成功地表现出拉胀行为作为一个纱线，并结合到织物。HAY基于双螺旋几何结构，其中相对较硬的“包裹物”螺旋地缠绕在柔性芯纤维周围。本文研究了芯纤维和包层纤维之间的相互作用对HAY拉胀行为的影响，包括它们的相对模量的影响。泊松比的HAY的评估表明，组件模量的差异升高导致包裹纤维嵌入到芯纤维本身，从而降低拉胀效应。仔细确定最佳的芯-包模量比，其中该比足够高以产生拉胀效应并且足够低以防止芯-压痕效应，可以导致制造具有最大负泊松比的纱线。(C)2014爱思唯尔有限公司版权所有。
Materials with a negative Poisson's ratio are referred to as auxetic. One recently invented example of this is the helical auxetic yarn (HAY). This has been proved to successfully exhibit auxetic behaviour both as a yarn and when incorporated into fabric. The HAY is based on a double-helix geometry where a relatively stiffer 'wrap' is helically wound around a compliant core fibre. This paper studies the effect of the interaction between the core and the wrap fibre on the auxetic behaviour of the HAY, including the effect of their relative moduli. Assessment of the Poisson's ratio of the HAYs has revealed that an elevated difference in component moduli causes the wrap fibre embedding itself into the core fibre, thus decreasing the auxetic effect. Careful determination of an optimum core-wrap moduli ratio where the ratio is high enough to yield an auxetic effect and low enough to prevent the core-indentation effect can lead to the fabrication of a yarn with largest negative Poisson's ratio. (C) 2014 Elsevier Ltd. All rights reserved.