Study on Impact Energy Absorbing Performance of EPS Buffer Layer of Motorcycle Helmet

EPS buffer layer of Motorcycle helmet is significant for protecting the head, experiments were conducted in order to obtain the impact energy absorbing characteristics of EPS buffer layers which were designed to have different densities, According to the analysis of the test results, mechanical behavior of EPS cushioning material was discussed, and the influence law of material density to collision energy absorption characteristics of EPS material was analyzed specifically. The results showed that dual density EPS buffer layer design of the top of the helmet can effectively reduce the peak acceleration of collision to about 200G, The density of EPS material can be properly designed based on the relationship of stress and collision energy absorption rate, and thereby collision energy absorbing characteristics of the EPS buffer layer is better. When the EPS density was chosen to be 0.06g/cm3, its collision energy absorption of buffer layer approach the best effect.