VOLUME DEFECT FATIGUE FAILURE OF CERAMIC BALLS UNDER ROLLING CONDITION |
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| Authors: | ZHOU Jingling WU Guoqing CHEN Xiaoyang |
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| Affiliation: | [1]College of Mechanical Engineering, Nantong University, Nantong 226007, China [2]School of Mechatronical Engineering and Automation, Shanghai University, Shanghai 200072, China |
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| Abstract: | A newly developed pure rolling fatigue test rig with three contact points is used to test the rolling contact fatigue properties of silicon nitride ceramic balls. Ball surfaces are examined after failure with optical microscopy and scanning electron microscopy. The failure cause, fatigue phenomenon and mechanics are analyzed. The research shows that subsurface cracks play a dominant role in the formation of spalling failure. These cracks originated from volume defects of the material and propagate, to form elliptical fatigue spalls under the action of principal tensile stresses. The principal tensile stress increases with increasing contact load, causing spall formation and reduction of rolling contact life. The greater the principal tensile stress is, the more severe the peeling of near surface is. Under the same condition, the closer volume defects are to the surface, the more likely failure occurs, the shorter the rolling contact life is. |
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| Keywords: | Silicon nitride Pure rolling Fatigue failure Volume defect CONDITION ROLLING BALLS CERAMIC FAILURE FATIGUE DEFECT condition severe peeling subsurface spall reduction life tensile stress increasing load form action principal |
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