TIMKEN bearings fatigue failure is a failure surface, mainly the fatigue crack initiation, expansion and fracture process, the fault in the load alternating under long-term effects of the metal. Cracks in two aspects:
1, on the surface, this is the role of TIMKEN bearings in the process of rolling contact, due to the cyclical changes of the work surface plastic deformation and strain hardening the surface of the contact stress caused by external load, and finally from the development of small cracks the inner surface of the formation of surface cracks in between the two wedged into the lubricant of the work surface, open the power to crack down on the wall, forcing the crack to move forward;
2, from the surface, repeated stress, the surface of contact, the first place to a certain depth in the exposed surface of the crack cracks along the surface direction of the point of view, to a certain depth from the surface of the contact surface, and beyond surface, and eventually the formation of erosion stripped, leaving a Ma Hang.
Imports from TIMKEN bearing on the surface, or from the cracks of the surface layer, these two goals (parts carburizing, quenching and other surface heat treatment, uneven hardness, organizations, and non-uniform internal stress and other adverse, contact stress from the opposite underground cracks under the influence, if the part surface quality is poor, there is a defect (oxidation, decarburization), friction, or poor lubrication, the surface crack.


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