Dynamic thermo-mechanical and impact properties of helical auxetic yarns

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 polyethyl...

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Bibliographic Details
Published in:Composites. Part B, Engineering Engineering, 2016-08, Vol.99, p.494-505
Main Authors: Zhang, Guanhua, Ghita, Oana R., Evans, Kenneth E.
Format: Article
Language:English
Subjects:
Auxetic
Dynamic tests
Dynamics
Fibers
Fibres
Hay
Impact behaviour
Mechanical testing
Polyethylenes
Thermomechanical
Urethane thermoplastic elastomers
Yarns
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Summary: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.
ISSN:1359-8368
1879-1069
DOI:10.1016/j.compositesb.2016.05.059