The purpose of this study is to examine the head injury and the injury level by using the dynamic explicit finite element (FE) method. Until mow, several brain injury models, which are used for head collision analysis, have been proposed. Although the brain injury model consists of over 10,000 FE, only a little information exists concerning the explicit modeling of the cerebral blood vessels. In this study, a multi-scale analysis by using a brain organ micro FE model, which in obtained by dividing one the macro head FE, was carried out by employing the velocities on the boundary of the micro FE method, which are provided by macro FE crash analyses.
