A Research On Finite Element Modeling And Impact Damage Of Elderly Human Head

In recent years,because of the frequent occurrence of automobile traffic accidents,the safety of passengers has been paid more and more attention by the public.In all traffic accidents,the death rate of head injury is the highest.The study of head injury of different age group of passengers shows that the death rate of brain injury in the elderly occupies the highest proportion.Compared with the young,the body function of the elderly gradually declined,and there were serious calcification of bone,decreased vision and slow response.Therefore,it is of great significance to carry out the research on head collision injury in the elderly.Nowadays,with the development of computer technology and the rapid development of finite element modeling technology,researchers use finite element simulation experiment instead of cadaver test to study the brain damage of passengers in the event of vehicle collision.At the same time,a series of head finite element models are developed for different collision situations.However,there are few finite element models for the elderly,which makes it limited to use the head finite element model simulation experiment to study the head impact injury in the elderly.Therefore,in order to develop the research on the mechanism of head collision injury and improve the simulation degree of the head finite element model on the actual human body,this paper constructs a head finite element model based on the finite element method.The validity and biological fidelity of the model are verified by comparing the simulation experiment with the corresponding cadaver test data.Secondly,the characteristics of head injury in frontal collision of the elderly were studied and the biomechanical response of the injury was analyzed.The simulation experiments of low speed and high speed collision are carried out on the forehead of the head model,and the comparison and analysis are made with the hybrid III head finite element model.The results show that the finite element model of the head of the elderly has high biological fidelity,which can better simulate the damage mechanism of the head during the collision.In the frontal collision experiment,the main features are the concave injury of the outer plate of the skull,the damage of the brain impact point and the hedging injury.In addition,compared with hybrid Ⅲ head finite element model,the model has higher dynamic mechanical response,and its impact stiffness and peak stress are higher than hybrid Ⅲ head finite element model.This paper has a certain reference significance for the research of the elderly head model and the biomechanical response of injury.