Low-kinetic energy impact response of auxetic and conventional open-cell polyurethane foams

ALLEN, Tom, SHEPHERD, Jonathon, HEWAGE, Trishan M, SENIOR, Terry, FOSTER, Leon and ALDERSON, Andrew (2015). Low-kinetic energy impact response of auxetic and conventional open-cell polyurethane foams. physica status solidi b, 252 (7), 1631-1639.

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Link to published version:: https://doi.org/10.1002/pssb.201451715


This paper reports quasi-static and low-kinetic energy impact testing of auxetic and conventional open-cell polyurethane foams. The auxetic foams were fabricated using the established thermo-mechanical process originally developed by Lakes. Converted foams were subject to compression along each dimension to 85% and 70% of the unconverted dimension during the conversion process, corresponding to linear compression ratios of 0.85 and 0.7, respectively. The 0.7 linear compression ratio foams were confirmed to have a re-entrant foam cell structure and to be auxetic. Impact tests were performed for kinetic energies up to 4 J using an instrumented drop rig and high speed video. A flat dropper was employed on isolated foams, and a hemisperical shaped dropper on foams covered with a rigid polypropylene outer shell layer. The flat dropper tests provide data on the rate-dependency of the Poisson’s ratio in these foam test specimens. The foam Poisson’s ratios were found to be unaffected by the strain rate for the impact energies considered here. Acceleration-time data are reported along with deformation images from the video footage. The auxetic samples displayed a 6 times reduction in peak acceleration, showing potential in impact protector devices such as shin or thigh protectors in sports equipment applications. Keywords : auxetic, foam, impact, negative Poisson’s ratio

Item Type: Article
Additional Information: Article first published online: 24 APR 2015
Research Institute, Centre or Group - Does NOT include content added after October 2018: Centre for Sports Engineering Research
Materials and Engineering Research Institute > Modelling Research Centre
Identification Number: https://doi.org/10.1002/pssb.201451715
Page Range: 1631-1639
Depositing User: Andrew Alderson
Date Deposited: 02 Jun 2015 10:43
Last Modified: 17 Mar 2021 19:31
URI: https://shura.shu.ac.uk/id/eprint/10080

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