重型牵引车后桥振动疲劳分析及试验研究

为提高重型牵引车后桥结构耐久性能，解决冲焊结构后桥推力杆上支架、后盖焊缝、直焊缝等容易发生疲劳破坏等问题，将冲焊桥替换成铸钢桥，通过仿真和试验相结合的方法对比冲焊桥和铸钢桥结构耐久性能指标，建立车桥虚拟实验台，并通过对比试验校核虚拟实验台模型.应用振动疲劳分析方法求解铸钢桥和冲焊桥的疲劳寿命，并用疲劳台架试验验证仿真结果.仿真和试验结果一致，表明铸钢桥壳的疲劳耐久性能要强于冲焊桥壳的疲劳耐久性能，采用铸钢桥的重型牵引车可有效提高结构可靠性. 

Vibration Fatigue Analysis and Experimental Study of Heavy Duty Truck Rear Axle

To improve the durability of heavy tractor rear axle,the durability problem,such as rod-bracket failure,welding line and straight seam-weld crack was focused to be solved. Attempting to replace the welded axle with cast steel axle,several proj ects were carried out including the durability comparison between cast-steel axle and welded axle,the development of a virtual test platform for vehicle axle,and the virtual-test model examination by contrast experiment.A vibration fatigue analysis method was applied to solve cast-steel axle and welded axle life,and the bench test was taken to verify the simulation result.The simulation and test results identically show that the cast-steel axle is better than welded in fatigue life,the heavy tractor assembled with cast-steel axle can improve its structure reliability effectively.