Critical assessment of helmet retention system test methods

Gilchrist, A.; Mills, N. J.

Affiliations

¹School of Metallurgy and Materials, University of Birmingham, Birmingham B 15 2TT, UK

Abstract

The validity of helmet retention system test methods have been evaluated by considering the impact mechanics of accidents, and the mechanical design of the tests. The test methods are simple falling weight lab tests where the drop height of the mass is adjusted to reproduce the type of failures found in accidents. The causes of force peaks and oscillations in the test traces have been identified, and a means found of obtaining reliable chin strap force measurements. Recommendations are made for improving the test, so that chin straps and buckles are adequately strong but not over-designed. It is vital to measure the dynamic force and to relate it to the likely force in an accident. The retention system effectiveness test has reduced the incidence of helmet roll-off by an inertial mechanism, but oblique impacts can still cause roll-off.

Cited Works (2)

Year	Entry
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Cited By (1)

Year	Entry
1998	Hurt HH Jr, Thom DR, Ouellet JV. Testing the positional stability of motorcycle helmets. In: Proceedings of the 16th International Technical Conference on the Enhanced Safety of Vehicles (ESV). May 31–June 4, 1998; Windsor, Ontario, Canada.2323-2330.