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

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Purpose:The toughest challenge in pedestrian traffic accident identification lies in ascertaining injury manners.This study aimed to systematically simulate and parameterize 3 types of craniocerebral injury including impact injury,fall injury,and run-over injury,to compare the injury response outcomes of different injury manners.Methods:Based on the total human model for safety(THUMS)and its enhanced human model THUMS-hollow structures,a total of 84 simulations with 3 injury manners,different loading directions,and loading 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 injury response of all areas of the brain.To examine the association between injury conditions and injury consequences,correlation analysis,principal component analysis,linear regression,and stepwise linear regression 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 and strain as impact speed increases.In high-speed impact(＞40 km/h),the Von Mises stress on the skull was with a high possibility exceed the threshold for skull fracture(100 MPa).When falling and making temporal and occipital contact with the ground,the opposite side of the impacted area experiences higher frequency stress concentration than contact at other conditions.Run-over injuries tend to have a more comprehensive craniocerebral injury,with greater overall deformation due to more adequate ki-netic energy conduction.The mean value of maximum principal strain of brain and Von Mises stress of cranium 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 role in craniocerebral injury in impact and fall loading conditions(the p of all F-test＜0.05).A regression equation of the craniocerebral injury manners in pedestrian accidents was established.Conclusion:The study distinguished the craniocerebral injuries caused in different manners,elucidated the biomechanical mechanisms of craniocerebral injury,and provided a biomechanical foundation for the identification of craniocerebral injury in legal contexts.

Craniocerebral injuryFinite elementInjury mechanismTraffic accidentBiomechanismForensic practice

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

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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

School of Forensic Medicine,Guizhou Medical University,Guiyang,550004,China

Key Laboratory of Forensic Pathology,Ministry of Public Security PR China,Guangzhou,510050,China

National Key Research and Development PlanNational Natural Science Foundation of ChinaShanghai Yangfan Special ProgrammeNatural Science Foundation of Shanghai2023 Open Foundation of Key Laboratory of Forensic Pathology,Ministry of Public Security,P.R.ChinaShanghai Key Laboratory of Forensic MedicineShanghai Forensic Service PlatformCentral Research Institute Public Project

2022YFC33020028217187223YF144870021ZR1464600GAFYBL20230821DZ227080019DZ2290900GY2023Z-3

2024

10.1016/j.cjtee.2024.03.010

中华创伤杂志(英文版)
中华医学会

中华创伤杂志(英文版)

CSTPCD
影响因子：0.608
ISSN：1008-1275
年,卷(期)：2024.27(4)
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