Parameters Study On Pedestrian Finite Element Model Of Traumatic Brain Injury During Vehicle Collision Accident

The invention of the automobile has brought great convenience to the human life, but with the development of the society, it also brings the security problem. Recently, the pedestrian injury in traffic accident is gathering increasing number of attention from many scientific research institutions. For the reason that pedestrians are weaker than cars, the pedestrians will be extremely easily injured when accidents occur. In auto- pedestrian crash, pedestrian head injuries account for more than 30% of total body damage, becoming the main cause of pedestrian deaths caused by traffic accident. This kind of injury can also lead to loss of human capabilities even sequelae, causing huge economic losses to the victims' families and society. Great importance has been attached to the pedestrian safety problem worldwide. Therefore, the researches on the mechanism of the pedestrian craniocerebral injury in a traffic accident have very important practical significance.In this paper, the 50 th percentile head finite element model for the study, the sensitivity of the various components of the intracranial portion of the material properties were analyzed. Performed for the higher sensitivity of the material parameters of orthogonal experimental design from which to get the best match program parameters, And verify the model contrast, the specific research work as follows:1. Study on the material parameters of model. Further study of skull and brain tissue material properties, sensitivity analysis of the head model of each part of material properties with factorial design multi factor, multi-level. Further confirmed that the material properties of brain tissue of the skull, cerebrospinal fluid, meninges, and has an important influence on the impact caused by intracranial pressure. And using the orthogonal test method, experiments were carried out according to the material parameters of high sensitivity, to obtain the best parameters from the matching scheme.2. Head model validation and application. The effectiveness of the biomechanical response of the human head model is validated by using internationally recognized classic cadaver experimental data. The simulation is verified by the dynamic response of the intracranial pressure, intracranial Nahum et al Trosseille et al, compared the model fidelity after Change the parameters.3.Application parameters change model, summarize the typical traffic accident facial collision type, simulation common collision scenarios of maxillofacial injuries, analysis of head of intracranial pressure, von Mises stress, shear stress and strain biomechanical parameters. Comparison of cerebral tissue tolerance threshold, analysis obtained, the position and direction of the facial collision is the location and severity of the key factors leading to facial fracture, and fracture of facial trauma in a certain extent are associated with TBI related, so the same is TBI key influence factors.