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International Journal of Automotive Technology > Volume 19(2); 2018 > Article
International Journal of Automotive Technology 2018;19(2): 301-312.
doi: https://doi.org/10.1007/s12239-018-0029-9
INVESTIGATION OF OCCUPANT LOWER EXTREMITY INJURES UNDER VARIOUS OVERLAP FRONTAL CRASHES
Fuhao Mo1, Shuyong Duan2, Xiaoqing Jiang3, Sen Xiao4, Zhi Xiao2, Wei Shi1, Kai Wei1
1Hunan University
2Hebei University of Technology
3CRRC Zhuzhou Institute Co.
4Ltd
ABSTRACT
Objective: With widely usage of restraint system, fatal injuries to occupants have been largely limited while non-fatal lower extremity injuries have not been effectively improved. The present study aims to investigate occupant lower extremity injuries under realistic impact environments.
Methods:
A biofidelic lower extremity model, a dummy model and a car cab model were combined to set up a realistic impact environment. Three typical frontal impact groups were simulated. Occupant global lower kinematics, long bone axial force and bending moment were presented to in-depth investigate lower extremity injury mechanism and tolerance.
Results:
Various overlap frontal impacts cause totally different lower extremity kinematics in the combination of structural invasion and restraint system effects. The femur fracture occurred at a small axial force of 7.57 kN combing a substantial bending moment peak of 172 Nm. Ankle joint injuries were found in 100 % and 25 % overlap impacts that present large tibial axial force and joint rotation angle.
Conclusions:
Overall results indicate that a coupling threshold of femur axial force and bending moment is of rationality to predict global femur fracture. The ankle joint injury occurrence is significantly related to the coupling effects of tibia axial force and excessive self-kinematics.
Key Words: Lower extremity, Axial force, Bending moment, Frontal crash, Finite elements
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