Fatigue Fracture Mechanism of Rod End Body of Rod End Joint Bearing
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摘要: 在拉压载荷作用下杆端关节轴承的杆端体发生断裂，通过断口形貌和显微组织观察，微区成分和硬度测试，分析了其疲劳断裂机制。结果表明：杆端体分别在其环与杆的过渡区域（位置A）以及与杆成45°方向的环上（位置B）发生疲劳断裂；杆端体环的内表面与关节轴承外圈的外表面之间存在严重的微动磨损，导致裂纹萌生；在拉压载荷作用下，位置B处的微裂纹首先扩展并导致断裂，位置B处的断裂使位置A处的受力方向发生改变，杆端体发生倾斜导致位置A处开裂和杆端体的最终断裂。Abstract: The rod end body of a rod end joint bearing fractured under tensile and compression loads. The fatigue fracture mechanism was analyzed by the observation of fracture morphology and microstructure and the measurement of micro area composition and hardness. The results show that the fatigue fracture of the rod end body occurred in the transition area between the rod and ring (position A) and on the ring in 45° direction to the rod (position B). Serious fretting wear existed between the ring inner face of the rod end body and the outer ring outer face of the joint bearing, resulting in the initiation of cracks. Under the tensile and compression loads, the microcracks at position B first propagated, leading to the fracture. The fracture at position B changed the force direction at position A, leading to the inclination of the rod end body. The inclination resulted in the cracking at position A, and finally led to the fracture of rod end body.
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Keywords:
- fretting wear /
- fatigue property /
- fracture /
- rod end joint bearing
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