The fabrication and mechanical properties of a novel 3-component auxetic structure for composites
The fabrication and mechanical properties of a novel 3-component auxetic structure for composites
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DOI：
10.1016/j.compscitech.2015.06.012
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发表时间：
2015-09-29
影响因子：
9.1
通讯作者：
Evans, K. E.
中科院分区：
文献类型：
--
作者：
Zhang, G. H.;Ghita, O.;Evans, K. E.
功能性拉胀复合材料可以由常规组分或拉胀组分制成。螺旋拉胀纱（HAY）是一种新型的复合材料拉胀增强材料。本文探讨了泊松比行为的进一步发展的HAY，需要为许多实际应用。3-组分拉胀纱线基于刚性包裹纤维（第一组分）螺旋缠绕在由鞘（第三组分）涂覆的弹性体芯纤维（第二组分）周围。所得到的结构可以克服在制造和使用双组分HAY期间先前遇到的问题，例如包裹物的滑动和包裹角度的变化。传统的和新的系统的机械性能进行了研究，重点工程和真实的泊松比之间的差异。利用一个真正的拉伸模量和一个真正的泊松比的重要性被证明。这是第一次在文献中报道的实验拉胀效应分析HAYs进行了比较真实和工程泊松比。我们表明，取决于第三组分的涂层厚度，3-组分拉胀系统可以表现出拉胀行为，并且涂层厚度可以作为一个新的设计参数来定制这种新型复合材料增强材料的泊松比和模量，用于广泛的应用。(C)2015爱思唯尔有限公司版权所有。
Functional auxetic composite materials can be fabricated from conventional or from auxetic components. The helical auxetic yarn (HAY) is a recently invented auxetic reinforcing component for composite materials. This paper investigates the Poisson's ratio behaviour of a further development of the HAY, needed for many practical applications. The 3-component auxetic yarn is based on a stiff wrap fibre (the first component) helically wound around an elastomeric core fibre (the second component) coated by a sheath (the third component). The resultant structure can overcome problems such as slippage of the wrap and changes in wrapping angles previously encountered during the manufacture and utilisation of the two-component HAY. The mechanical performance of conventional and novel systems is investigated; with emphasis on the differences between the engineering and true Poisson's ratio. The importance of the utilisation of a true tensile modulus and a true Poisson's ratio is demonstrated. This is the first time reported in the literature that an experimental auxetic effect analysis of HAYs was carried out by comparing true and engineering Poisson's ratio. We show that depending on the coating thickness of the third component, the 3-component auxetic system can demonstrate auxetic behaviour, and the coating thickness can be employed as a new design parameter to tailor both the Poisson's ratio and modulus of this novel composite reinforcement for a wide range of applications. (C) 2015 Elsevier Ltd. All rights reserved.