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Roughness Effect in Micropitting and Rolling Contact Fatigue of Silicon Nitride

1
Department of Mechanical Engineering, Howard University, Washington, DC 20059, USA
2
Zero Technology LLC, Blue Ridge, GA 30513, USA
3
Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028, USA
*
Author to whom correspondence should be addressed.
Ceramics 2019, 2(1), 135-147; https://doi.org/10.3390/ceramics2010013
Received: 31 December 2018 / Revised: 8 February 2019 / Accepted: 13 February 2019 / Published: 18 February 2019
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Abstract

An experimental analysis of the role of surface roughness parameters on micropitting and the succeeding rolling contact fatigue (RCF) of silicon nitride against AISI 52100 steel under lubricated conditions was performed. In accelerated fatigue tests using a four-ball tester, the arithmetic mean, root mean square, and peak-to-valley roughnesses of silicon nitride surfaces varied, while the roughness of the steel surface was unchanged. The correlation between the fatigue life and roughness parameters for silicon nitride was obtained. The peak-to-valley roughness was the roughness parameter that dominantly affected the RCF life of silicon nitride. The micropitting of surfaces leading to fatigue intensified as the roughness was increased. Extensive micropitting was observed on the rolling track beyond the trailing edge of the spall region in the circumferential direction. View Full-Text
Keywords: roughness parameters; silicon nitride; peak-to-valley roughness; fatigue; micropitting roughness parameters; silicon nitride; peak-to-valley roughness; fatigue; micropitting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mosleh, M.; Bradshaw, K.K.; Smith, S.T.; Belk, J.H.; Shirvani, K.A. Roughness Effect in Micropitting and Rolling Contact Fatigue of Silicon Nitride. Ceramics 2019, 2, 135-147.

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