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Open AccessArticle

A Micropitting Study Considering Rough Sliding and Mild Wear

State Key Laboratory of Mechanical Transmissions, Chongqing University, Chongqing 400030,China
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Coatings 2019, 9(10), 639; https://doi.org/10.3390/coatings9100639
Received: 20 August 2019 / Revised: 28 September 2019 / Accepted: 28 September 2019 / Published: 3 October 2019
Micropitting is a typical surface contact fatigue in rolling–sliding contact. The kinematic sliding is of great significance in the initiation and progression of micropitting. A numerical surface fatigue model considering rolling–sliding contact and surface evolution is developed based on mixed-EHL (elastohydrodynamic lubrication) theory, rainflow cycle counting method and Archard’s law. Surface evolution is evaluated using Archard’s wear law based on measured teeth surface topography. Surface damage is determined via the Palmgren–Miner line rule and Goodman diagrams. The effect of rolling speed and surface roughness are discussed in detail. Results show that stress micro-cycles are introduced by rough sliding in the rolling–sliding contact. The mild wear reduces the height of asperities, the maximum pressure and alleviates subsurface stress concentration. For rolling–sliding contact, the faster moving surface dominates the composite height of asperities, then decides the fluctuations of pressure, as well as stress ranges. The combination of surface topography should be considered in the surface design.
Keywords: micropitting; rolling–sliding contact; mild wear; stress micro-cycles micropitting; rolling–sliding contact; mild wear; stress micro-cycles
MDPI and ACS Style

Zhou, Y.; Zhu, C.; Liu, H. A Micropitting Study Considering Rough Sliding and Mild Wear. Coatings 2019, 9, 639.

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