Abstract
This paper is devoted to study of the helmets which can provide protection for the operator against head injury during an rollover accident. In the present study, the proposed procedure is demonstrated with the help of a validated madymo model of a featureless Hybrid Ⅲ headform in conjunction with a helmet model comprising an outer polypropylene shell to the inner surface of which is bonded a protective polyurethane foam padding of a given thickness, a parametric analysis has been performed in order to investigate the effect of different densities and thickness of the polyurethane foam on the head injury during impact. Based on simulation results of impact on a rigid surface, it appears that a minimum foam padding thickness of 15 mm is necessary for obtaining an acceptable value of HIC(d). The HIC(d) value decreases as an increase of the foam thickness, and the effect of the foam density variable is nonlinear, a second order parabolic shape can be identified.
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