车辆减振器活塞杆偏摩现象的疲劳分析  

Fatigue Analysis of Piston Rod for Vehicle Shock Absorber under Deflecting Friction

作　　者：温敏健[1] 杨建伟[1] 

机构地区：[1]北京建筑工程学院,机电与汽车工程学院,北京100044

出　　处：《机械设计与研究》2012年第5期110-113,共4页Machine Design And Research

基　　金：国家自然科学基金资助项目(51175028);北京市属高等学校人才强教计划资助项目(201106125);北京市优秀人才培养资助项目(2010D005017000007);北京建筑工程学院博士启动基金项目(101001704)

摘　　要：车辆在行驶中,减振器活塞杆不仅承受随机交变的轴向力的作用,而且承受交变的侧向力作用,在此情况下极易发生弯曲疲劳破坏,即偏摩现象。通过对前悬架系统力学建模,分析了减振器和活塞杆在车轮平面和车轴平面内的受力情况,采用Workbench软件对活塞杆在偏摩下进行应力计算,并利用S-N曲线和Goodman修正理论分析不同载荷状况下活塞杆疲劳寿命,试验结果表明,疲劳破坏部位发生在活塞杆中部焊接挡圈部位,这与实际中活塞杆易出现的失效的部位相吻合。When Vehicle is in motion,Piston rod for shock absorber not only withstand random alternating axial force,but also bear alternating lateral force.In this case it occurs bending fatigue damage easily.This is the phenomenon of deflecting friction.Through modeling the front suspension system,we analyze the stress of the shock absorber and the piston rod at the wheel and axle plane.With using Workbench software,we calculate stress under deflecting friction,at the same time we analyze piston rod＇s fatigue life in different load condition with utilizing its S-N curve and Goodman curve.The result shows that fatigue damage occurs in the central of piston rod＇s welding block.It is consistent with the reality.

关 键 词：减振器 活塞杆 偏摩 仿真分析 疲劳寿命 

分 类 号：U461.4[机械工程—车辆工程] TH117.1[交通运输工程—载运工具运用工程]