The analysis of accidents involving two-wheeled motorized vehicles reveals the high incidence of fracturing of helmet shells.
The severity of injuries increases because of the following two phenomena : The loss of the helmet during the occurrence of collision and the very poor distribution of impact forces against the shock-absorbent material.
The occurrence of fractures is closely dependant upon the two following factors :
The type of material of the shell and the violence of collisions.
The present investigation therefore aims primarily to define a performance criterion in accordance with real-world collisions.This criterion could be required for future certification tests and should enable Lhe selection of the most efficient materials.