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Type: Journal article
Title: Peak acceleration during impact with helmet materials: effects of impactor mass and speed
Author: Hutchinson, T.
Citation: European Journal of Sport Science, 2014; 14(Suppl. 1):377-382
Publisher: Taylor & Francis Ltd
Issue Date: 2014
ISSN: 1746-1391
Statement of
Timothy Paul Hutchinson
Abstract: The impact properties of six foam materials used for energy absorption as the liner of children’s helmets, reported by Gimbel and Hoshizaki are considered further. In high-energy impacts, almost complete compression of the energy absorbing material (bottoming out) may occur, and the severity of the impact increases greatly. Too soft a material means bottoming out occurs at low speeds, but if it is too stiff, the material itself is injurious. The fitting of equations to results in‘no bottoming out’ and ‘bottoming out’ conditions may help assessment of what compromise is appropriate. The equations in this article correspond to peak acceleration being proportional to power functions of impactor speed and mass. 1. When there was no bottoming out, peak acceleration was found to be proportional to mˆ(c-1).vˆ(2c), with c being approximately 0.25. 2. For bottoming out, peak acceleration was found to be proportional to mˆ(p).vˆ(q), with p and q being approximately 2 and approximately 3. 3. The constants of proportionality were related to material density in a regular way.
Keywords: Impact; bottoming out; head injury; polymeric material; helmet
Rights: © 2012 European College of Sport Science
RMID: 0020120849
DOI: 10.1080/17461391.2012.705334
Appears in Collections:Centre for Automotive Safety Research publications

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