Dynamic thermo-mechanical and impact properties of helical auxetic yarns

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• 作者：Guanhua Zhang ; ^{guanhuazhang1@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Oana R. Ghita ; Kenneth E. Evans
• 关键词：Fibres ; Impact behaviour ; Thermomechanical ; Mechanical testing ; Auxetic
• 刊名：Composites Part B: Engineering
• 出版年：2016
• 出版时间：15 August 2016
• 年：2016
• 卷：99
• 期：Complete
• 页码：494-505
• 全文大小：2996 K

文摘

This paper presents an experimental investigation of the dynamic thermo-mechanical and impact properties of helical auxetic yarns (HAYs). A series of thermoplastic polyurethane (TPU) core fibres fabricated using an extrusion process have been wrapped with either ultra-high-molecular-weight polyethylene (UHMWPE) wrap or stainless steel wire wrap to form helical auxetic yarns. Dynamic mechanical analysis (DMA) measurements indicated that the core/wrap diameter ratio and the initial wrap angle influenced significantly the dynamic thermo-mechanical behaviour of HAYs. The impact test results have shown that the fibre property, impact velocity and the initial wrap angle had great effect on the impact response of a HAY. Importantly, in this work it is shown that an optimal wrap angle can be found to give the best combination of stiffness, energy absorption and auxetic performance of HAYs.