Abstract
Considering that the Pc-Crash multibody dynamics software can reproduce the accident process accurately and obtain the collision parameters of pedestrian heads at the moment of head landing, the finite element analysis method can accurately analyze the injury of the pedestrian head when the boundary conditions are known. This paper combines the accident reconstruction method with the finite element analysis method to study the injury mechanism of pedestrian head impact on the ground in vehicle pedestrian collision accidents to provide a theoretical basis for pedestrian protection and the improvement of vehicle shapes. First, a real-life vehicle pedestrian collision is reproduced by Pc-Crash. The simulation results show that the rigid multibody model can accurately simulate the scene of the accident, then the speed and angle of the pedestrian head landing moment can be obtained at the same time. Second, the finite element model of human heads with a detailed facial structure is established and verified. Finally, the collision parameters obtained from the accident reconstruction are used as the boundary conditions to analyze the collision between the pedestrian head and the ground, and the biomechanical parameters, such as intracranial pressure, von Mises stress, shear stress and strain, can be determined. The results show that the stress wave will propagate inside and outside the skull and cause stress concentration in the skull and the brain tissue to varying degrees after the pedestrian head strikes the ground. When the stress exceeds a certain limit, it will cause different degrees of brain tissue injury.
Highlights
With the development of automobile technology, transportation has become more convenient and efficient, but it leads to more traffic accidents, whose contributing factors may be the driver’s demographic or behavioral characteristics, vehicle’s technical characteristics, roadway conditions and environmental factors
In order to mitigate the enormous economic and emotional burden brought to the society by traffic accidents, people are devoted to reducing the frequency and severity levels of traffic crashes
The main contribution of this paper is to provide a set of feasible research methods for the pedestrian head landing injury in vehicle pedestrian collision accidents
Summary
With the development of automobile technology, transportation has become more convenient and efficient, but it leads to more traffic accidents, whose contributing factors may be the driver’s demographic or behavioral characteristics, vehicle’s technical characteristics, roadway conditions and environmental factors. The limitation of the rigid multibody is that it is difficult to obtain the Analysis of craniocerebral injury in facial collision accidents specific biomechanical parameters of the head, and it is difficult to analyze the specific mechanism of head injury For the latter, the finite element analysis method was used to study the damage caused to the head by falling from different heights, but they did not combine their research with studies of real-life vehicle pedestrian collision accidents. The collision parameters are obtained through accident reconstruction, and the pedestrian head landing injury analysis is carried out on this basis This method can effectively reproduce the scene of the accident, judge the severity of head injury, and analyze the injury mechanism, which can provide a reference for further study of pedestrian head protection and improvement of vehicle head shape.
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