The University of Adelaide CENTRE FOR AUTOMOTIVE SAFETY RESEARCH

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TitlePeak acceleration during impact with helmet materials: Effects of impactor mass and speed
AuthorsHutchinson TP
Year2014
TypeJournal Article
AbstractThe 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 m (c−1).v (2c), with c being approximately 0.25. 2. For bottoming out, peak acceleration was found to be proportional to m (p).v (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.
ISSN1746-1391
Journal TitleEuropean Journal of Sport Science
Journal Volume (Issue)14(S1)
Page RangeS377-S382
Notes19/3/14 MS

Reference
Hutchinson TP (2014) 'Peak acceleration during impact with helmet materials: Effects of impactor mass and speed', European Journal of Sport Science, 14(S1), pp S377-S382.