The Study Of Occupant Foot Joint Crash Injure Analysis And Its Role In Vehicle Safety Restraint System

With the rapid development of automobile industry, increasing traffic accidents, vehicle safety is increasingly highlighted serious. In the frequent traffic accidents, lower extremity injuries accounted for more than40%of the total injuries, while the foot in the lower limbs plays an important role in the body to maintain upright posture of the support points. Therefore, in the issues of vehicle safety, the biomechanical response and injury mechanism of the foot in the field of automotive safety should be given priority. With the development of finite element techniques, finite element model of human foot had been constructed; but the foot models construced are not perfect, such as the anatomical structure is not detailed, the quality of mesh elements is not high. Therefore, the establishment of a finite element model of the human foot with detailed anatomical structures by hexahedral elements will play an important effect in studying the mechanism and biomechanical response of the lower of vehicle occupant.The main aim of this study is as follows:1With reference to the anatomy structure of human foot,the foot structure were extracted based on CT image data by using the methods of thresholding segmentation three-dimensional geometric model of the human foot were constructed by using the technology of three-dimensional reconstruction.2A finte elemnt model of human foot with detailed anatomical structures by hexahedral elements was established based on the geometric model by using the mesh technology.3The finite element model of the foot were simulated and analyzed, the results of simulation correlated well with results of cadaveric experiments, which showed a good validity of the model.4The crash of brake pedal with foot was simulated by the finite element model, the foot heel and ligaments are vulnerable to be injuried.This research would help to improve vehicle safety, provided a reference of the security measures for pedestrians and occupants,and also provided reliable and fundamental data for foot biomechanical simulation in the future.