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Surface ring crack defects are normally found on the surfaces of ceramic balls. These ring cracks are circular extending for approximately one quarter of circumference of a circle and these cracks can significantly reduce rolling contact fatigue life. In this study, a boundary element analysis was carried out to identify the main factors governing the propagation of sub-surface cracks. The calculations...
Surface defects such as ring cracks are located on silicon nitride ceramic rolling elements. The random nature of ring crack position creates difficulties in predicting rolling contact fatigue (RCF) life. The influence of the lubricant on the RCF mechanism is difficult to determine due to the scattered nature of RCF life. In this study, a novel experimental technology was utilised to perform rolling...
Silicon nitride has been found to have the optimum combination of properties which are suitable for rolling element bearing applications to withstand high loads, severe environments, and high speeds. Surface ring cracks are difficult to detect but are found on the surface of silicon nitride balls. These ring crack defects decrease the rolling contact fatigue life considerably. This paper presents...
The influence of ring crack location within the contact path on rolling contact fatigue failure has been studied using numerical fracture analysis. The numerical calculations are based on a three-dimensional model for the ring crack propagation. The ring crack is considered as a conic shape with a curved line as the crack front. The rolling contact loading is simulated by repeated Hertzian point contact...
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