A Micropitting Study Considering Rough Sliding and Mild Wear

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...

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Bibliographic Details
Published inCoatings (Basel) Vol. 9; no. 10; p. 639
Main Authors Zhou, Ye, Zhu, Caichao, Liu, Huaiju
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2019
Subjects
Algorithms
Asperity
Competition
Contact pressure
Contact stresses
Crack propagation
Elastohydrodynamic lubrication
Evolution
Investigations
Lubricants & lubrication
Palmgren-Miner rule
Rolling speed
Sliding contact
Stress concentration
Surface roughness
Topography
Viscosity
Wear
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Summary: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.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings9100639