Parametric analysis of craniocerebral injury mechanism in pedestrian trafficaccidents based on finite element methods  

作　　者：Jin-Ming Wang Zheng-Dong Li Chang-Sheng Cai Ying Fan Xin-Biao Liao Fu Zhang Jian-Hua Zhang Dong-Hua Zou 

机构地区：[1]Academy of Forensic Science,Shanghai Key Laboratory of Forensic Medicine,Key Laboratory of Forensic Science,Ministry of Justice,Shanghai Forensic Service Platform,Shanghai,200063,China [2]School of Forensic Medicine,Guizhou Medical University,Guiyang,550004,China [3]Key Laboratory of Forensic Pathology,Ministry of Public Security PR China,Guangzhou,510050,China

出　　处：《Chinese Journal of Traumatology》2024年第4期187-199,共13页中华创伤杂志（英文版）

基　　金：The study was funded by grants from the National Key Researchand Development Plan(2022YFC3302002);the National NaturalScience Foundation of China(82171872);Shanghai Yangfan SpecialProgramme(23YF1448700);Natural Science Foundation ofShanghai(21ZR1464600);the 2023 Open Foundation of Key Laboratory of Forensic Pathology,Ministry of Public Security,P.R.China(GAFYBL202308);Shanghai Key Laboratory of Forensic Medicine(21DZ2270800);Shanghai Forensic Service Platform(19DZ2290900);Central Research Institute Public Project(GY2023Z-3).

摘　　要：Purpose:The toughest challenge in pedestrian traffic accident identification lies in ascertaining injurymanners.This study aimed to systematically simulate and parameterize 3 types of craniocerebral injuryincluding impact injury,fall injury,and run-over injury,to compare the injury response outcomes ofdifferent injury manners.Methods:Based on the total human model for safety(THUMS)and its enhanced human model THUMShollow structures,a total of 84 simulations with 3 injury manners,different loading directions,andloading velocities were conducted.Von Mises stress,intracranial pressure,maximum principal strain,cumulative strain damage measure,shear stress,and cranial strain were employed to analyze the injuryresponse of all areas of the brain.To examine the association between injury conditions and injuryconsequences,correlation analysis,principal component analysis,linear regression,and stepwise linearregression were utilized.Results:There is a significant correlation observed between each criterion of skull and brain injury(p<0.01 in all Pearson correlation analysis results).A 2-phase increase of cranio-cerebral stress andstrain as impact speed increases.In high-speed impact(>40 km/h),the Von Mises stress on the skull waswith a high possibility exceed the threshold for skull fracture(100 MPa).When falling and makingtemporal and occipital contact with the ground,the opposite side of the impacted area experienceshigher frequency stress concentration than contact at other conditions.Run-over injuries tend to have amore comprehensive craniocerebral injury,with greater overall deformation due to more adequate kinetic energy conduction.The mean value of maximum principal strain of brain and Von Mises stress ofcranium at run-over condition are 1.39 and 403.8 MPa,while they were 1.31,94.11 MPa and 0.64,120.5 MPa for the impact and fall conditions,respectively.The impact velocity also plays a significant rolein craniocerebral injury in impact and fall loading conditions(the p of all F-test<0.05).A regressionequation of the

关 键 词：Craniocerebral injury Finite element Injury mechanism Traffic accident Biomechanism Forensic practice 

分 类 号：R651.15[医药卫生—外科学]