Research On Finite Element Modeling And Injury Evaluation Of Human Head With Refinement Percentile

How to reduce or avoid the damage of traffic users in traffic accidents has become a popular research in the field of automobile safety.Persons in traffic accidents have the highest brain fatalities and injuries.Therefore,in-depth study of human head biomechanical response,injury mechanism and tolerance limit in traffic accidents is of great significance for improving automobile safety and related regulations.A head biomechanical model with high precision of was developed based on the CT data of the 50 th percentile Chinese male.The model included complete anatomical structure of skull,parietal bone,brain,cerebellum,brain stem,cerebrospinal fluid,skin as well as eyes,nose,teeth and other organs.Based on the model scaling theory and the measurement data of head,the scaling factors between different percentile were calculated by the method of linear difference.Four more head models of 5,10,90 and 95 percentiles were constructed by the use of scaling method according to the principle of constant density and constant stress.After checking the dimensional error and element quality of each model,The biofidelity of models were evaluated based on the simulations of PMHS tests.The results showed that five models developed in this study had a high level of biofidelity.Various collision simulations of different percentile head with hood,windscreen and airbag were conducted respectively using the verified head models.The influence of percentile height and collision positions difference on head injury was analyzed.The head injury index and risk in the head-to-hood collision increased with the rise of percentile and the rigidity of collision positions.Besides,the head injury index and risk in the head-to-front windshield collision got obvious growth with the rise of percentile and the rigidity of collision positions.For occupant,the high-speed expanding fabric bag sharply impacted the head under the condition of safety belt not fastened and the higher the head percentile,the more severe the head injury.The model can be used as an important tool to study the biomechanics of human head injury in traffic accidents,and can provide a useful reference for vehicle safety design.