Journal
COMPOSITES PART B-ENGINEERING
Volume 99, Issue -, Pages 494-505Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2016.05.059
Keywords
Fibres; Impact behaviour; Thermomechanical; Mechanical testing; Auxetic
Funding
- UK Engineering and Physical Science Research Council (EPSRC) [EP/J004553/1]
- EPSRC [EP/J004553/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J004553/1] Funding Source: researchfish
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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. (C) 2016 The Authors. Published by Elsevier Ltd.
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