Kinematic equation and injury risk analysis of the chest of 6-year-old child occupant under frontal crash

doi:10.3969/j.issn.1674-8484.2022.04.002

Abstract

Abstract:

This paper aimed at clarifying the thoracic injury mechanism of 6-year-old child occupants in frontal crashes. A child restraint system (CRS) was selected based on the ECE R129 regulation. The differences between the Hybrid III 6YO dummy model and the THUMS 6YO human finite element model were compared of the kinematic response and of the injury indicators. Thoracic kinetic equations were established on the Hybrid III 6YO dummy model to analyzed the effects of internal and external forces on the thorax acceleration in frontal crashes, and to analyzed the strains on the ribs, the heart and the lungs of the THUMS 6YO human finite element mode, before deriving the thoracic injury risk to the child occupants. The results show that the neck force and the safe shoulder belt force on the Hybrid III 6YO dummy model have a greater effect on the chest centroid synthesis acceleration. The chest centroid synthesis acceleration achieves 52.1g for the THUMS 6YO human finite element model, and 38.8g for the Hybrid III 6YO dummy model, both are below the regulatory reference values.

Key words: automotive safety, frontal impact, 6-year-old children, chest injury, Hybrid III 6YO dummy, THUMS 6YO finite element model of human body

CLC Number:

U461.99

YE Fan, WANG Bingyu, HAN Yong, YE Saifeng, YU Yi. Kinematic equation and injury risk analysis of the chest of 6-year-old child occupant under frontal crash[J]. Journal of Automotive Safety and Energy, 2022, 13(4): 617-624.

Figures/Tables 15

References 23

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编号	长度/mm	厚度/mm	直径/mm
2	750	2.0	75.5
3	650	2.0	75.5
4	1 080	0.8	75.5
5	850	2.0	75.5

编号	长度/mm	厚度/mm	直径/mm
2	750	2.0	75.5
3	650	2.0	75.5
4	1 080	0.8	75.5
5	850	2.0	75.5

模型	a g	D mm	VC_max m s^-1	ε / %
模型	a g	D mm	VC_max m s^-1	肋骨	心脏	肺部
IARV	55.0	40.0	1.00	3.6~4.5	30.0	35.0
Hybrid III 6YO	52.1	13.8	0.12	—	—	—
THUMS 6YO	38.8	25.0	0.10	3.9	65.6	87.9

模型	a g	D mm	VC_max m s^-1	ε / %
模型	a g	D mm	VC_max m s^-1	肋骨	心脏	肺部
IARV	55.0	40.0	1.00	3.6~4.5	30.0	35.0
Hybrid III 6YO	52.1	13.8	0.12	—	—	—
THUMS 6YO	38.8	25.0	0.10	3.9	65.6	87.9