汽车转向横拉杆失效原因分析  

Failure Analysis of Automobile Steering Tierod

作　　者：卢柳林[1] 冯继军[1] 黄文长[1] 彭贤锋[1] 

机构地区：[1]东风汽车有限公司东风商用车技术中心,武汉430056

出　　处：《失效分析与预防》2011年第4期253-256,共4页Failure Analysis and Prevention

摘　　要：某公司的汽车转向横拉杆在使用过程中多次发生断裂。通过对转向横拉杆的断口形貌,材质的金相组织、化学成分和硬度,受力情况及结合有限元对转向横拉杆断裂原因进行了分析。结果表明:造成转向横拉杆断裂的主要原因为拉杆在汽车行驶过程中受到异常冲击力而发生弯曲,从而造成弯曲部位的受力状态发生变化,导致转向横拉杆发生双向弯曲疲劳断裂。Fracture frequently occurred to the automobile steering tie-rods.In order to find out the failure mode and cause,fracture observation,chemical composition and hardness testing,metallographic examination and finite element analysis were carried out.The results show that the fracture of the steering tie-rod is biaxial bending fatigue fracture.The steering tie-rod bended due to abnormal impact during driving,resulting in the change of stress of the bending region.As a result,fatigue fracture occurred.

关 键 词：转向横拉杆 断裂 双向弯曲疲劳 有限元分析 

分 类 号：U463.41[机械工程—车辆工程] U465.1[交通运输工程—载运工具运用工程]