Full definition
False brinelling is a wear phenomenon that occurs in rolling element bearings when they are subjected to oscillatory motion while remaining stationary. Unlike traditional brinelling, which results from excessive static loads leading to permanent deformation of the bearing surfaces, false brinelling is characterized by micro-sliding or fretting that takes place at the bearing raceways. This form of wear can occur in scenarios where equipment is in standby mode or during transportation, exposing bearings to ambient vibrations. The repeated micro-movements generate elliptical cavities on the raceways, often accompanied by reddish residue indicative of iron oxide formation due to the wear of the rolling elements. The presence of these wear patterns signifies that while the bearings might not be visibly damaged, their operational integrity could be compromised, leading to premature failure if not addressed. This issue is particularly critical in applications where bearings are not regularly rotated or where machines are left idle for extended periods, making them susceptible to false brinelling. To mitigate this issue, various solutions can be implemented, including the use of anti-fretting lubricant additives such as molybdenum disulfide (MoSâ‚‚) or ester-based lubricants that enhance the film strength and reduce direct metal-to-metal contact. Additionally, applying a light preload on the bearings or instituting periodic rotation can help prevent the conditions conducive to false brinelling, ensuring that the bearing surfaces maintain their integrity over time.