“…then sufficient time and conditions are needed to initiate friction between both sides of the crack, which leads to WECs formation. Some scholars [85] thought that the difference of cyclic stress between positive and negative slip states led to the initiation of cracks in the negative slip region. As shown in Figure 7, due to an asymmetrical stress distribution caused by temperature rise, the negative slip surface underwent cyclic stress of tension and compression.…”
Section: Microstructural Alterationmentioning
confidence: 99%
“…This reversed cyclic stress causes the cracks to tend to appear and extend in the negative slip area. Figure 7 Effect of positive/negative slip contact on surface stress distribution [85] (a) surface stress distribution under negative slip; (b) surface stress distribution under positive slip (c) surface stress distribution by thermal induction which presents an asymmetric feature; (d) resulting stress by combining (a) and (c); (e) resulting stress by combining (b) and (c).…”
The microstructure evolves during the service of bearings, and feature microstructures appear after a certain period of time. The microstructural evolution has a great impact on the service life of bearings, resulting in a significant deviation from the calculated life. This paper summarised the research progress of the microstructural evolution. Four feature microstructures including Butterfly, White Etching Cracks, Dark Etching Region, and White Etching Bands were reviewed about the phase composition, mechanical properties, and mechanisms. Several proposed mechanisms were analysed and discussed on the rationality and insufficiency, and the latest theories have been emphasised. Previous microstructural alterations were also included. At last, the relationship between feature microstructures and fatigue failure was analysed through previous studies.
“…then sufficient time and conditions are needed to initiate friction between both sides of the crack, which leads to WECs formation. Some scholars [85] thought that the difference of cyclic stress between positive and negative slip states led to the initiation of cracks in the negative slip region. As shown in Figure 7, due to an asymmetrical stress distribution caused by temperature rise, the negative slip surface underwent cyclic stress of tension and compression.…”
Section: Microstructural Alterationmentioning
confidence: 99%
“…This reversed cyclic stress causes the cracks to tend to appear and extend in the negative slip area. Figure 7 Effect of positive/negative slip contact on surface stress distribution [85] (a) surface stress distribution under negative slip; (b) surface stress distribution under positive slip (c) surface stress distribution by thermal induction which presents an asymmetric feature; (d) resulting stress by combining (a) and (c); (e) resulting stress by combining (b) and (c).…”
The microstructure evolves during the service of bearings, and feature microstructures appear after a certain period of time. The microstructural evolution has a great impact on the service life of bearings, resulting in a significant deviation from the calculated life. This paper summarised the research progress of the microstructural evolution. Four feature microstructures including Butterfly, White Etching Cracks, Dark Etching Region, and White Etching Bands were reviewed about the phase composition, mechanical properties, and mechanisms. Several proposed mechanisms were analysed and discussed on the rationality and insufficiency, and the latest theories have been emphasised. Previous microstructural alterations were also included. At last, the relationship between feature microstructures and fatigue failure was analysed through previous studies.
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