Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 03, 2017 - September 06, 2017
Head injury is one of the most severe injuries in most bicycle accidents and helmet is one of the most effective ways to protect the head from injuries. This paper discussed how the bicycle helmets prevented human brain damage due to head rotation by using headform and human FE models. The headform was dropped to a rigid ground and relationship between rotational acceleration and the moment of force (Euler's rotation equation) was examined. Helmeted and unhelmeted human FE models were also dropped in order to examine the rotational motion of head and brain injury in side and rear impacts. The cumulative strain damage measure (CSDM) can be decreased by using the helmet under the both impact conditions whereas neck was compressed and bent due to translational motion of upper and lower bodies. It was concluded that the helmets reduced the brain strain under the conditions set in this study.
