M.Sc. Tezi Görüntüleme | |||||||||||||||||||||
|
|
||||||||||||||||||||
| Summary: In this thesis, a three-dimensional human head under the different impact loadings was modeled by using finite element method and the distributions of pressure and stress occurred in the skull and the brain were investigated. A model suitable to anatomical conditions was scanned by Optical Scanner in order to constitute the surface (2 –D) model. The 3–D head model including the skull, brain and the Cerebro Spinal Fluid (CSF) was then modeled by using a commercial solid modeling (3–D), program, CATIA. This 3–D human head model was then imported to the LS–DYNA 3D, finite element analysis program, in order to investigate the pressure and the stress distributions in the skull and the brain for frontal, occipital and side impacts. While the material properties for the skull was taken as elastic both elastic and viscoelastic properties were used for the brain in the finite element analysis.From the frontal impact the obtained values of pressure and stress distributions for the skull and brain were given in the graphics with the some literature data for comparison purpose. Then the distributions of pressure and stress distributions obtained from occipital impact were analyzed. Finally the side impact of the human head was investigated. The results obtained from this thesis show that including the brain and CSF to the human head model did not largely affect the pressure values of the skull. However, the position of the head, being straight forward or inclined, affected the pressures occurred on the skull. The investigated material properties of the brain, elastic and viscoelastic, affected the pressure and the stress values obtained from the brain whereas the pressure values were not affected by the position of the head. Finally this investigation resulted that the frontal impact was the most dangerous impact for the skull while those of for brain was found to be side impact.
| |||||||||||||||||||||