汽车减振器连杆磨损失效和断裂力学分析

采用扫描电子显微镜观察连杆磨损表面形貌，并结合断裂力学方法研究了减振器连杆的磨损机理。研究结果表明：导向器衬套中的玻璃纤维在服役过程中崩出，作为磨粒存在于连杆和村套摩擦副接触表面之间，可压碎铬铰层使裂纹扩展，并且断裂的铬镀层也可成为磨粒；连杆铬铰层存在裂纹缺陷加剧其磨损，连杆磨损机理是以断裂机翩为主导的磨粒磨损机制，裂纹扩展是磨损的控制因素，并且以Ⅰ型断裂为主导；摩擦力是裂纹扩展的主要驱动力。

Wear Failure and Fracture Mechanics Analysis of Automobile Absorber Connecting Rod

The wear mechanism of the absorber connecting rod s was investigated by means of fracture mechanics and scanning electron microsco pic observation of the worn surfaces of the connecting rods. The results show th at the glass fibers in the guiding bush were pulled out and existed between the contacting surfaces of the connecting rod and guiding bush during the operation of the absorber connecting rod. The detached glass fibers could act as abrasive particles to cause abrasive wear of the rod, by way of crushing the chromium-pl ating layer on the rod surface and accelerating the propagation of cracks. The c rush chromium-plating layer could then also act as abrasive particles to enhanc e the abrasive wear of the connecting rod, which was also accelerated by the cra ck defects in the chromium-plating layer. The wear of the connecting rods is ch aracterized by abrasive wear which is dependent on the crack propagation near th e interface of the chromium-plating layer and the rod matrix. The fracture mech anism is characterized by mode Ⅰ fracture, while the friction force is the domi nant driving force for the propagation of the cracks.