抄録
It is quite important to understand the damage state in brain at head impact, in the view point of the medical treatments and recognition of the brain injury. In past similar studies in which the conventional FEM was used, each part of the brain, such as cerebrum, cerebellum, corpus callosum and brain stem, has been treated as same material, and in most studies the liner elastic properties were chosen to the model instead of the hyper elastic one. Additionally, in some studies some of the brain parts were neglected in the FE model because of the difficulty of the modeling. In this study, to investigate the damage state in the brain at the impact accurately, the head impact simulations were performed using the 3D head model containing all part of the brain as mentioned above, where the material properties of each part of the brain obtained from the tensile test using fresh bovine brain, were applied to each brain part model. Then the validity of the simulation was checked comparing the calculated stress-strain state with medical images. As the result, the minimum principal strain around the corpus callosum was remarkably larger than the one in the case of applying the material properties of cerebrum to the all part of the brain.
