Effect of Structure and Wearing Modes on The Protective Performance of Industrial Safety Helmet.

Abstract

The aim of this study is to explore the effects of structure designs and wearing modes on the protective performance of safety helmets under falling object impact. Four helmet types (no helmet, V-shaped, dome-shaped, and motorcycle helmets) and five wearing modes (left and right tilt by 5°, backward tilt by 15°, 0° without chin strap, 0° with chin strap) were included in this study. and the axial impact of concrete block under different impact velocities is simulated. The results show the energy and shock absorption effects of the foam cushion are better than the suspension system of traditional industrial safety helmets. The structure of the top of V-shaped helmets is designed to withstand greater impact. As regards the wearing mode, the deflection angle of the helmet strap not only increases the stress in the brain tissue and skull as well as the magnitude of the intracranial pressure, but also leads to the diffusion of the pressure to the forehead.