Many studies and analyses of head injury mechanisms under translational and rotational impact, using Finite Element (FE) simulation, have been carried out. However, most of them did not consider the individual differences of head shapes. In this study, Head FE Models that represent Japanese male head shapes were constructed using statistical analysis and shape transformation method. Translational impact, rotational impact and combinations of these were applied to the models to determine the influence of individual differences of head shape on brain responses. These differences have significant effects on the pressure and shear stress responses of the brain. Difference of maximum and minimum values of the responses cannot be neglected in comparison to the brain injury thresholds reported before. In combinations of translational and rotational impact simulations, significant increases in coup and contrecoup pressures were also confirmed.
