Bearing fatigue damage in two ways, the most important one is the most bearing parts appear spalling pits (pitting), the depth and direction of the rolling contact surfaces on the measured width of the same order of magnitude. Pitting forming in load, the metal particles crack mouth edge appears, and a scrolling direction along pitting expanding trend bearings can not use the result. Standard bearing life calculation must first determine the situation does appear to operate until the damaged work deadlines.
The second form is surface spalling. Shallow depth peeling, usually only a few microns, or less than 1μm (some literature called up to 20μm). Usually in the bearings running tens of millions of turn or turn into segments after peeling. Such peeling type into segments in most cases will not damage the general purpose (ie, no special requirements) of the bearing, while the high-precision and high-speed bearings, it is not allowed to come off the above into segments.


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