The material behavior of the standard bearing steel SAE 52100 and the heat resistant bearing steels M50, M50 NiL, and Cronidur 30 as a function of the operational temperature has been investigated. The reduction in rolling contact fatigue strength due to a temperature rise was found to be significantly higher than the reduction of hardness. The mechanism of heat generation due to the bearing operation induces a temperature distribution, which makes it necessary to distinguish between the temperature ruling the subsurface fatigue processes and a higher temperature dominating the surface originated damage initiation.
SurJace-initiated fatigue and wear caused by contamination is one of the major causes for bearing failures in aerospace applications.This paper outlines a method to precisely define cleanliness wilh the help of the cleanliness factor s and the contamination faclor V . Particle sires and filtration ratios are deJined and allocated to certain V factors. These factors can then be atered into a proposed bearing lye calculalion method to quantity the eflect of system cleanliness/ contamination on the attainable bearing lijii. A procedure to improve system cleanliness is described (pre-cleaning concept) so that contamination related damage can be eliminated.
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