A mathematical model is presented in this paper for rolling-sliding contacts operating in a mixed regime of elastohydrodynamic lubrication and boundary lubrication. The model is based on the framework of Johnson et al. (1972, “A Simple Theory of Asperity Contacts in Elastohydrodynamic Lubrication,” Wear, 19, pp. 91–108). It incorporates into this framework a number of important asperity-level variables including asperity friction, friction-induced plastic flow, flash temperature, and boundary-film tribo-chemistry. The model yields a number of variables useful for the assessment of the state of the mixed lubrication. They include the load sharing between fluid and asperities, area of asperity contacts, and fraction area of asperity contacts undergoing plastic flow along with experimentally measurable variables such as the traction coefficient, friction power intensity, and temperature of the overall contact. The model is limited to mixed-lubrication problems in which the load is mainly carried by the fluid pressure and the total area of asperity contacts is a small percentage of the Hertz area. Further development is possible to formulate a model into a wider mixed-lubrication regime using some modeling concepts developed in this paper in conjunction with other modeling techniques.
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April 2014
Research-Article
A Mathematical Model for the Mixed Lubrication of Non-Conformable Contacts With Asperity Friction, Plastic Deformation, Flash Temperature, and Tribo-Chemistry
L. Chang,
L. Chang
Department of Mechanical and
Nuclear Engineering,
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
;Advanced Institute of Manufacturing
With High-Tech Innovations,
With High-Tech Innovations,
National Chung Cheng University
,Ming-Hsiung, Chia-Yi 621
, Taiwan
Search for other works by this author on:
Yeau-Ren Jeng
Yeau-Ren Jeng
Advanced Institute of Manufacturing
With High-Tech Innovations,
With High-Tech Innovations,
National Chung Cheng University
,Ming-Hsiung, Chia-Yi 621
, Taiwan
Search for other works by this author on:
L. Chang
Department of Mechanical and
Nuclear Engineering,
Nuclear Engineering,
The Pennsylvania State University
,University Park, PA 16802
;Advanced Institute of Manufacturing
With High-Tech Innovations,
With High-Tech Innovations,
National Chung Cheng University
,Ming-Hsiung, Chia-Yi 621
, Taiwan
Yeau-Ren Jeng
Advanced Institute of Manufacturing
With High-Tech Innovations,
With High-Tech Innovations,
National Chung Cheng University
,Ming-Hsiung, Chia-Yi 621
, Taiwan
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 31, 2013; final manuscript received January 15, 2014; published online February 24, 2014. Assoc. Editor: Robert L. Jackson.
J. Tribol. Apr 2014, 136(2): 022301 (9 pages)
Published Online: February 24, 2014
Article history
Received:
May 31, 2013
Revision Received:
January 15, 2014
Citation
Chang, L., and Jeng, Y. (February 24, 2014). "A Mathematical Model for the Mixed Lubrication of Non-Conformable Contacts With Asperity Friction, Plastic Deformation, Flash Temperature, and Tribo-Chemistry." ASME. J. Tribol. April 2014; 136(2): 022301. https://doi.org/10.1115/1.4026589
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