Effect of neck posture on biomechanical response in rear end collision

doi:10.3969/j.issn.1674-8484.2022.01.004

Abstract

Abstract:

Based on the CT image data of Chinese 5th percentile female volunteers, a finite element model of neck natural posture with detailed anatomical structure was constructed, and its effectiveness was verified by reconstructing volunteer experiment. The neck extension and flexion posture models was constructed. According to the China-New Car Assessment Program (C-NCAP) whiplash test, the acceleration curves of three neck models with different postures were applied respectively to investigate the biomechanical response of drivers and passengers with different postures. The results show that in natural posture, the maximum stress appears in C7 vertebral body, anterior longitudinal ligament between atlas and foramen magnum, and saccular ligament of atlantoaxial joint; the maximum stress of intervertebral disc appear in C6 - C7 vertebral segment, and NIC and N_km values reach the threshold. The maximum stress in extended posture is the same as that in natural attitude, but the stress value and N_km value are the least of the three postures. In flexion posture, the maximum stress of cortical bone appears at the saccular ligament of axis odontoid and atlantoaxial joint, but NIC value is the smallest among the three postures. This research has a certain reference value for the research and the development of vehicle active headrest and the collision protection measures when the occupant’s neck is in leisure posture in future automatic driving.

Key words: automotive safety, neck of the 5th percentile female, finite element model, neck posture

CLC Number:

U461.91

LI Haiyan, LI Guangming, HE Lijuan, RAN Linghua, LV Wenle, CUI Shihai, RUAN Shijie. Effect of neck posture on biomechanical response in rear end collision[J]. Journal of Automotive Safety and Energy, 2022, 13(1): 55-62.

Figures/Tables 9

References 17

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组织		弹性模量	Poison比		密度	单元类型
组织		MPa	Poison比		mg·mm^-3	单元类型
皮质骨	12 000		0.29	1.83		壳单元
松质骨	450		0.29	1.00		实体单元
终板	500		0.40	1.83		壳单元
纤维环	110		0.40	1.20		实体单元
髓核	体积弹性 2 290 短效剪切2		长效剪切1.40	0.183		实体单元
前纵韧带	30		0.30	1.10		膜单元
后纵韧带	20		0.30
棘间韧带	10		0.30
棘上韧带	8.55		0.30
横突间韧带	10		0.30
囊韧带	10		0.30
黄韧带	20		0.30

组织		弹性模量	Poison比		密度	单元类型
组织		MPa	Poison比		mg·mm^-3	单元类型
皮质骨	12 000		0.29	1.83		壳单元
松质骨	450		0.29	1.00		实体单元
终板	500		0.40	1.83		壳单元
纤维环	110		0.40	1.20		实体单元
髓核	体积弹性 2 290 短效剪切2		长效剪切1.40	0.183		实体单元
前纵韧带	30		0.30	1.10		膜单元
后纵韧带	20		0.30
棘间韧带	10		0.30
棘上韧带	8.55		0.30
横突间韧带	10		0.30
囊韧带	10		0.30
黄韧带	20		0.30

姿态	F_x	M_y	F_int	M_int	N_km
自然姿态	251.2	33.4	845	47.5	1.0
伸展姿态	132.5	17.6	845	47.5	0.5
屈曲姿态	200.9	26.6	845	47.5	0.8

姿态	F_x	M_y	F_int	M_int	N_km
自然姿态	251.2	33.4	845	47.5	1.0
伸展姿态	132.5	17.6	845	47.5	0.5
屈曲姿态	200.9	26.6	845	47.5	0.8