Abstract
The remaining useful life prediction of the bearings after long-term service is a crucial issue. Exploring the fatigue failure mechanism of bearing is helpful to grasp the dynamic evolution law during its whole period. In this paper, the tensile and fatigue property degradation law of bearings for high-speed train under different service mileages were explored. The results display that there is a downward trend for the tensile/fatigue strength and elongation of the bearing as prolonging its service mileage. The area proportion of dimples declines while that of cleavage plane increases in bearing steel after long-term service. The variations of secondary crack length and equivalent diameters of cleavage plane indicate that more cracks initiated in damaged bearing under cyclic loading. Based on the energy principle, the fatigue failure mechanism of bearings after long-term service was elaborated with the plastic deformation, crack initiation and growth resistance. The results would provide theoretical reference for the fatigue property degradation law of high-speed train bearings.
Published Version
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