汽车正面40%重叠碰撞车身修复后耐撞性分析  

Influence of Small Overlap Frontal Oblique Impact Conditions on the Crashworthiness of Car Body

作　　者：许鹏善 XU Peng-shan(School of Automotive Engineering,Baiyin Vocational of Mining and Metallurgy,Baiyin 730900,Gansu,China)

机构地区：[1]白银矿冶职业技术学院汽车工程学院,甘肃白银730900

出　　处：《机械研究与应用》2025年第1期180-183,共4页Mechanical Research & Application

基　　金：甘肃省教育科学“十四五”规划2022年度一般课题项目:汽车正面40%重叠碰撞车身修复后耐撞性分析及优化改进在汽车维修专业教学中的应用研究(编号:GS[2022]GHB1963)。

摘　　要：为研究汽车正面40%重叠率撞击下车体主要承力部件的性能指标以及车身修复后的耐撞性,文章联合HyperWorks和LS-DYNA软件建立了整车以64 km/h速度碰撞可变形壁障的有限元模型,并进行仿真计算。依据仿真实验结果,分析碰撞过程中汽车主要承力部件的传力路径和冲击能量的吸收。通过对乘员舱各座椅处加速度、前围板侵入量及A柱上部折弯角时间曲线间接分析了车体的耐撞性。再利用ANSYS软件,对碰撞损坏情况下车身主要承力部件修复前后进行模态分析、疲劳分析,得出修复后的疲劳寿命较原始值低,相关结论为车身修复后的结构优化提供理论参考。In order to study the performance indexes of the main load-bearing parts of the car body under the frontal 40%overlap rate impact,as well as the crashworthiness of the car body after repair,the finite element model of the collision between the whole car and the deformable barrier at a speed of 64 km/h was established by combining the software of HyperWorks and LS-DYNA,and simulations were carried out.Based on the simulation results,the force transmission paths of the main load-bearing parts and the absorption of impact energy are analyzed during the collision.The crashworthiness of the car body is indirectly analyzed by the acceleration at each seat of the passenger compartment,the intrusion of the front enclosure and the time curve of the bending angle of the upper part of the A-pillar.Through the ANSYS software,modal analysis and fatigue analysis were conducted before and after the repair of the main load-bearing parts of the car body in the case of collision damage,and it was concluded that the fatigue life of the repaired car body was lower than the original value,which can provide theoretical references for the structural optimization of the car body after repair.

关 键 词：汽车安全性 车体耐撞性 40%重叠率碰撞 车身修复 有限元仿真 

分 类 号：U461.91[机械工程—车辆工程]