Initiation of secondary surface crack in the ring raceway of silicon nitride full ceramic bearing
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The existing application feedback and RCF study of silicon nitride ceramic bearings show that the main failure mode ofsilicon nitride full ceramic bearings is the material spalling on the rolling contact surface. The spalling failure is caused bythe expansion of the main surface crack and the initiation and expansion of the secondary surface crack under the rollingcontact. Therefore, in the current widespread application of silicon nitride full ceramic bearings, in order to improve thespalling fatigue life of silicon nitride ceramic bearings, we can only start from the perspective of studying the main surfacecrack propagation and secondary surface crack initiation and expansion mechanism of silicon nitride ceramic bearings. In thispaper, on the one hand, the Franc3D and ABAQUS joint simulation calculation of the rolling contact tensile stress of differentsurface main crack parameters (initial depth and initial inclination angle) and different rolling contact friction coefficientsleading to secondary surface crack initiation was completed. On the other hand, based on the fracture toughness experimentof silicon nitride material, the critical initial size of the secondary surface crack generated near the main surface crack iscalculated, and many useful conclusions are obtained. The research results will be able to improve the service life of siliconnitride ceramic ball bearings by guiding the development of grinding technology of silicon nitride ceramic ball bearings andthe regulation of service parameters of silicon nitride ceramic ball bearings.
Abstract
The existing application feedback and RCF study of silicon nitride ceramic bearings show that the main failure mode ofsilicon nitride full ceramic bearings is the material spalling on the rolling contact surface. The spalling failure is caused bythe expansion of the main surface crack and the initiation and expansion of the secondary surface crack under the rollingcontact. Therefore, in the current widespread application of silicon nitride full ceramic bearings, in order to improve thespalling fatigue life of silicon nitride ceramic bearings, we can only start from the perspective of studying the main surfacecrack propagation and secondary surface crack initiation and expansion mechanism of silicon nitride ceramic bearings. In thispaper, on the one hand, the Franc3D and ABAQUS joint simulation calculation of the rolling contact tensile stress of differentsurface main crack parameters (initial depth and initial inclination angle) and different rolling contact friction coefficientsleading to secondary surface crack initiation was completed. On the other hand, based on the fracture toughness experimentof silicon nitride material, the critical initial size of the secondary surface crack generated near the main surface crack iscalculated, and many useful conclusions are obtained. The research results will be able to improve the service life of siliconnitride ceramic ball bearings by guiding the development of grinding technology of silicon nitride ceramic ball bearings andthe regulation of service parameters of silicon nitride ceramic ball bearings.
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