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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 the vehicle is driving, the piston rod of the shock absorber not only withstands the random alternating axial force, but also withstands the alternating lateral force. In this case, the bending fatigue damage, that is, the partial friction phenomenon is easily occurred. Through the mechanical modeling of the front suspension system, the stress of shock absorber and piston rod in the plane of the wheel and the axis of the axle are analyzed. Workbench software is used to calculate the stress of the piston rod under partial friction. The SN curve and Goodman The correction theory analyzes the fatigue life of the piston rod under different load conditions. The experimental results show that the fatigue damage occurs in the welding ring part in the middle of the piston rod, which is consistent with the actual failure of the piston rod.