In all transmission applications, ball bearings can experience fatigue fracture damage when subjected to repeated bending that exceeds the material's fatigue strength. Repeated bending causes cracks (capillary cracks) in the bearing material, which gradually spread until penetrating cracks appear on the bearing ring or cage. This phenomenon is called fracture and cracking (fatigue fracture)
As shown in the following figure, the picture shows a fractured outer ring of a deep groove ball bearing. The bearing seat installed on the bearing has insufficient support in the load area, resulting in periodic bending stress on the outer ring of the bearing, ultimately leading to penetrating cracks on the outer ring.
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