Investigating the influence of the core material on the mechanical performance of a nitinol wire wrapped helical auxetic yarn.

Faisal, Nadimul Haque; Fowlie, Andrew; Connell, Joe; Mackenzie, Sean; Noble, Ryan; Prathuru, Anil Kumar

Abstract

Helical Auxetic Yarns (HAYs) can be used in a variety of applications, from healthcare to blast and impact resistance. This work focuses on the effect of the use of different core materials (e.g. rubber, polyurethane, polytetrafluoroethylene/teflon, polypropylene, polyetheretherketone, polycarbonate, acetal) with a nitinol wire wrap component on the maximum Negative Poisson Ratio (NPR) produced, and therefore the auxetic performance of Helical Auxetic Yarns (HAYs). From the analytical model, it was found that an acetal core produced the largest NPR when compared to the other six materials. The trend obtained from the experimental tensile tests (validation) correlated closely with the theoretical predictions of the NPR as axial strain was increased. The experimental method presented a maximum NPR at an average axial strain of 0.148, which was close to the strain of 0.155 predicted by theory. However, the maximum experimental NPR was significantly lower than that predicted by the analytical model.

Citation

FAISAL, N.H., FOWLIE, A., CONNELL, J., MACKENZIE, S., NOBLE, R. and PRATHURU, A.K. 2022. Investigating the influence of the core material on the mechanical performance of a nitinol wire wrapped helical auxetic yarn. Journal of strain analysis for engineering design [online], 57(5), pages 377-391. Available from: https://doi.org/10.1177/03093247211027085

• Journal Article Type: Article
• Acceptance Date: Jun 3, 2021
• Online Publication Date: Jun 26, 2021
• Publication Date: Jul 31, 2022
• Deposit Date: Jun 9, 2021
• Publicly Available Date: Jun 9, 2021
• Journal: Journal of strain analysis for engineering design
• Print ISSN: 0309-3247
• Electronic ISSN: 2041-3130
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• Volume: 57
• Issue: 5
• Pages: 377-391
• DOI: https://doi.org/10.1177/03093247211027085
• Keywords: Helical auxetic yarn (HAY); Design parameters; Negative Poisson's ratio (NPR); Nitinol; Mechanical performance; Safety applications
• Public URL: https://rgu-repository.worktribe.com/output/1358428
• Additional Information: The accompanying file contains supplementary material which can be found at the end of the main text.