The “Stribeck curve” is a well-known concept, describing the frictional behavior of a lubricated interface during the transition from boundary and mixed lubrication up to full-film hydrodynamic/elastohydrodynamic lubrication. It can be found in nearly every tribology textbook/handbook and many articles and technical papers. However, the majority of the published Stribeck curves are only conceptual without real data from either experiments or numerical solutions. The limited number of published ones with real data is often incomplete, covering only a portion of the entire transition. This is because generating a complete Stribeck curve requires experimental or numerical results in an extremely wide range of operating conditions, which has been a great challenge. Also, numerically calculating a Stribeck curve requires a unified model with robust algorithms that is capable of handling the entire spectrum of lubrication status. In the present study, numerical solutions in counterformal contacts of rough surfaces are obtained by using the unified deterministic mixed elastohydrodynamic lubrication (EHL) model recently developed. Stribeck curves are plotted in a wide range of speed and lubricant film thickness based on the simulation results with various types of contact geometry using machined rough surfaces of different orientations. Surface flash temperature is also analyzed during the friction calculation considering the mutual dependence between friction and interfacial temperature. Obtained results show that in lubricated concentrated contacts, friction continuously decreases as speed and film thickness increase even in the full-film regime until extremely high speeds are reached. This is mainly due to the reduction of lubricant limiting shear stress caused by flash temperature rise. The results also reveal that contact ellipticity and roughness orientation have limited influence on frictional behaviors, especially in the full-film and boundary lubrication regimes.
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April 2015
Research-Article
On the Stribeck Curves for Lubricated Counterformal Contacts of Rough Surfaces
Dong Zhu,
Dong Zhu
School of Aeronautics and Astronautics,
Sichuan University
,Chengdu 610065
, China
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Jiaxu Wang,
Jiaxu Wang
School of Aeronautics and Astronautics,
Sichuan University
,Chengdu 610065
, China
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Q. Jane Wang
Q. Jane Wang
Mechanical Engineering Department,
Northwestern University
,Evanston, IL 60208
State Key Laboratory of
Mechanical Transmission,
Mechanical Transmission,
Chongqing University
,Chongqing 400044
, China
Search for other works by this author on:
Dong Zhu
School of Aeronautics and Astronautics,
Sichuan University
,Chengdu 610065
, China
Jiaxu Wang
School of Aeronautics and Astronautics,
Sichuan University
,Chengdu 610065
, China
Q. Jane Wang
Mechanical Engineering Department,
Northwestern University
,Evanston, IL 60208
State Key Laboratory of
Mechanical Transmission,
Mechanical Transmission,
Chongqing University
,Chongqing 400044
, China
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 11, 2014; final manuscript received October 19, 2014; published online November 17, 2014. Assoc. Editor: Xiaolan Ai.
J. Tribol. Apr 2015, 137(2): 021501 (10 pages)
Published Online: April 1, 2015
Article history
Received:
June 11, 2014
Revision Received:
October 19, 2014
Online:
November 17, 2014
Citation
Zhu, D., Wang, J., and Jane Wang, Q. (April 1, 2015). "On the Stribeck Curves for Lubricated Counterformal Contacts of Rough Surfaces." ASME. J. Tribol. April 2015; 137(2): 021501. https://doi.org/10.1115/1.4028881
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