抄録
In order to investigate the influence factors on HIC (Head Injury Criterion) score of attenuation materials used for playground, impact tests were carried out in accordance with ASTM. Four kinds of the commercial attenuation materials were employed for the tests. The apparatus is composed of the missile made from aluminum alloy with a mass of 4.6 kg and a tri-axial accelerometer. The higher the missile was dropped, the more HIC score increased. From the time-frequency analysis, it was obvious that HIC score depended on the natural frequency of the vibration system in collision between the missile and the attenuation material. There was sufficient evidence to suggest that the use of a simple vibration system with a nonlinear spring is beneficial to assess HIC score.
