This study investigates the effects of the microdimple texture on the friction and surface temperature performances of a ball-on-disk contact, operating under the speed and load ranges that cover typical gearing applications. Circular-shaped microdimple arrays with different dimple center distances and dimple depths are implemented on the ball surface to quantify the impacts of these two parameters on the friction coefficient and the maximum ball surface temperature. In addition, the contacts of three surface texture combinations, namely microdimpled and polished ball surface versus polished disk surface, polished ball surface versus polished disk surface, and ground ball surface versus ground disk surface, are compared to demonstrate any beneficial or detrimental effect of microdimples in heavily loaded high-speed applications. This study adopts a thermal mixed EHL point contact model, whose capability and accuracy have been well demonstrated by comparing to the experimental measurements, to quantify the deterministic tribological behavior within the contact, allowing the exploration of the underlying mechanism that governs the role of microdimples in the elastohydrodynamic lubrication (EHL).
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July 2018
Research-Article
The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact
S. Li,
S. Li
Department of Mechanical and
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway,
Dayton, OH 45435
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway,
Dayton, OH 45435
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U. Parmar
U. Parmar
Department of Mechanical and
Materials Engineering,
Wright State University,
Dayton, OH 45435
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway
,Dayton, OH 45435
Search for other works by this author on:
S. Li
Department of Mechanical and
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway,
Dayton, OH 45435
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway,
Dayton, OH 45435
U. Parmar
Department of Mechanical and
Materials Engineering,
Wright State University,
Dayton, OH 45435
Materials Engineering,
Wright State University,
3640 Colonel Glenn Highway
,Dayton, OH 45435
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 2, 2017; final manuscript received January 26, 2018; published online March 2, 2018. Assoc. Editor: Xiaolan Ai.
J. Tribol. Jul 2018, 140(4): 041503 (12 pages)
Published Online: March 2, 2018
Article history
Received:
November 2, 2017
Revised:
January 26, 2018
Citation
Li, S., and Parmar, U. (March 2, 2018). "The Effects of Microdimple Texture on the Friction and Thermal Behavior of a Point Contact." ASME. J. Tribol. July 2018; 140(4): 041503. https://doi.org/10.1115/1.4039228
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