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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...
The properties of ceramics, specifically low density and high stiffness are of most interest to gas turbine and machine tool manufacturers. High hardness, low coefficient of thermal expansion and high temperature capability are properties also suited to rolling element materials. Much research over the past two decades on its structure, quality control and manufacturing techniques has produced ceramic...
The mechanism of surface failure from a pre-existing line defect under rolling contact has been studied using a boundary element method. A three-dimensional boundary element model has been developed in order to investigate how the pre-existing defect affects the surface fracture behaviour and to determine the geometry of acceptable line defects. Research shows that the pre-existing line defects significantly...
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