Abstract: In order to reduce casualties and property losses caused by vehicle collisions, based on the test procedure of China insurance automotive safety index (C-IASI), this paper establishes a finite element simulation model of frontal 25% offset collision with a certain car as the research object. The safety performance of vehicle in small offset collision is evaluated from the two aspects of vehicle deformation and dummy damage value, and the simulation model is optimized. The optimization results show that the maximum displacement of column A decreases from 159.38 mm to 94.73 mm, which is reduced by 40.73%. The maximum displacement of Shotgun decreases from 60.52 mm before optimization to 50.56 mm, a decrease of 16.44%. The maximum intrusion of the front coiling decreased from 226.78 mm before optimization to 203.29 mm, decreasing by 10.36%. The head injury criterion (HIC) of the dummy is decreased by 39.89%, and the viscous criterion (VC) of the dummy is decreased by 32.48%. This study can provide reference for the subsequent small bias crash test and vehicle structure optimization.

Key words: finite element method; C-IASI; frontal 25% offset collision; simulation analysis

摘要： 为减少因车辆碰撞导致的人员伤亡及财产损失，文章基于中国保险汽车安全指数 （C-IASI）试验规程，以某车型轿车为研究对象，建立正面 25%偏置碰撞有限元仿真模型， 从整车形变与假人伤害值两方面评估汽车在小偏置碰撞中的安全性能，并对仿真模型进行优 化。优化结果表明，A 柱最大位移量由 159.38 mm 下降为 94.73 mm，减小 40.73%；Shotgun 最大位移量从优化前 60.52 mm 下降为 50.56 mm，减小 16.44%；前围板最大侵入量从优化前 226.78 mm 下降为 203.29 mm，减小 10.36%；假人头部伤害指标（HIC）降低 39.89%，假人 胸部粘性指标（VC）降低 32.48%。该研究可为后续小偏置碰撞试验及整车结构优化提供参考。

关键词: 有限元法；C-IASI；正面 25%偏置碰撞；仿真分析