Dynamic thermo-mechanical and impact properties of helical auxetic yarns

作者：Zhang Guanhua^*; Ghita Oana R; Evans Kenneth E

来源：Composites Part B: Engineering , 2016, 99: 494-505.

DOI：10.1016/j.compositesb.2016.05.059

• Fibres
• Impact behaviour
• Thermomechanical
• Mechanical testing
• Auxetic

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.

• 出版日期2016-8-15