Bearing failure generally can be divided into the far turn failure and accuracy of the loss of two. Stop the failure of the bearing is terminated due to incapacity for work rotation. Such as stuck, fracture, etc.; precision loss refers to the bearing due to dimensional changes, the loss of the required accuracy of the original design can still continue to rotate, but in the case of non-normal operation, such as wear, corrosion, etc. Bearing failure are complex, but due to differences in working conditions and the structure of the various types of bearings, resulting in the failure modes and morphology vary. According to injury mechanism can be broadly divided into: contact fatigue failure, failure of friction and wear, fracture failure, deformation, failure, corrosion failure and changes in the clearance, such as the failure of several basic mode.
Contact fatigue (fatigue wear) failure
Contact fatigue failure is one of the most common failure mode for all kinds of bearings, the bearing surface by the role of cyclic contact stress of repeated failure. Contact fatigue spalling of the bearing surface of the part is a fatigue crack initiation, crack extended to the process. First initial contact fatigue crack from the following maximum orthogonal shear stress at the contact surfaces, and then extended to the surface pitting-like spalling or exfoliated, the former is known as pitting or pitting spalling; the latter is referred to as shallow spalling. If the initial crack in the border zone of the hardened layer and the core part, resulting in the early spalling of the hardened layer is referred to as hardening of the layer peeling.
(2) adhesion and abrasive wear failure
Various types of bearing surface is the most common failure modes. Bearing parts relative sliding friction between the surface metal continue to lose as the sliding wear. Continuous wear will make part size and shape change, bearing with the gap increases, the work surface morphology deteriorated, thus losing the rotation accuracy, so that the bearing does not work properly. The form of sliding wear can be divided into abrasive wear, adhesive wear, corrosion and wear, fretting wear, one of the most common abrasive wear and adhesion wear.
Between the friction surface of the bearing parts of the friction surface wear phenomenon is caused by the external hard particles or metal grinding abrasive wear. It is often the bearing surface caused by the chisel cut or furrow-like abrasions. External hard particles often come from dust in the air or impurities in the lubricant. Adhesion wear is mainly due to the contours of the peak of the friction surface of the friction surface uneven force all local frictional heat so that the friction surface temperature increased, causing the lubricant film rupture, partial melting of the surface layer of metal will be in serious, the point of contact adhesive, tear off the process of re-adhesion cycle, caused serious friction surface welding and stuck.



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