In view of the relatively serious situation of chest injuries in current vehicle accidents, this study aims to determine the chest injuries characteristics in frontal vehicle collisions under different overlaps. The frontal impact simulation was first established and conducted based on the latest THOR dummy model with different overlaps. By comparing chest dynamic output indicators under three different overlap rates in frontal impact conditions, the relationship between chest injuries and collision overlap rates was analyzed in terms of the chest deflection and stress/strain distribution. Results show that changes of the thoracic stress/strain distribution and the amplitude of chest deflection are more sensitive to frontal impact load under a great impact overlap. In the kinematics analysis, there is a significant twist along the seatbelt route to the occupant’s chest. The changes of the chest deflection and stress/strain based on the design parameter changes at different overlap rates are consistent, and the highest injury risk is captured in the ribcage structure of mid-chest in full frontal impact. The research results can provide a reference for the optimal design of the constraint system for the future.

中文翻译：

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三种典型重叠情况下正面车辆碰撞胸部损伤特征分析

针对当前车辆事故中胸部损伤较为严重的情况，本研究旨在确定不同重叠情况下正面车辆碰撞中胸部损伤的特征。基于最新的具有不同重叠度的THOR假人模型，首次建立并进行正面碰撞模拟。通过比较正面碰撞条件下三种不同重叠率下的胸部动态输出指标，从胸部偏转和应力/应变分布方面分析胸部损伤与碰撞重叠率之间的关系。结果表明，在较大的冲击重叠下，胸部应力/应变分布和胸部偏转幅度的变化对正面冲击载荷更为敏感。在运动学分析中，沿着安全带路线到乘员胸部有明显的扭曲。在不同重叠率下，基于设计参数变化的胸部挠度和应力/应变的变化是一致的，在全正面撞击中，胸部中部的胸腔结构捕获了最高的伤害风险。研究结果可为今后约束系统的优化设计提供参考。