Brain Tissue Deformation Considering 3-D Multiphase and Nonlinear Features

Based on brain tissue anatomy structure,a 3-D multiphase nonlinear model of the brain tissue is established,in which the main tissues such as cerebrum,cerebellum,brain stem,corpus callosum and cerebrospinal fluid are included,and the non-linearity of the cerebrum and the difference of the other five component parts are considered.Deformation of the brain tissue under rotational inertial loading is simulated using finite element method.The results of calculation show that larger strain(exists) near the boundary of different phases,and the maximum stress amounts to 257?Pa,appearing in the cerebrum.Grave deformation gradient leads to serious avulsion damage and diffuse axonal(injury)(DAI).