This paper addresses a largely ignored aspect pertaining to the elastohydrodynamic lubrication (EHL) traction behavior of fragile lubricants which undergo transition to glassy state at typical EHL contact zone pressures. For such lubricants, a conventional EHL model predicts extremely high and unrealistic values of traction coefficient, especially under near pure rolling conditions where thermal effect is negligible. Therefore, an EHL model incorporating the effect of limiting shear stress and the associated wall slip phenomenon is presented herein. Unlike the other such investigations involving limiting shear stress behavior, the present model employs Carreau-type power-law based models to describe the rheology of lubricants below the limiting shear stress along with realistic pressure-viscosity relationships (WLF and Doolittle-Tait). The use of Carreau-type shear-thinning model in this analysis allows the simultaneous prediction of minimum film thickness and traction coefficient for lubricants which shear-thin in the inlet zone and exhibit limiting shear stress behavior in the contact zone, a feature absent in the existing EHL models utilizing ideal visco-plastic or some other unrealistic rheological model. Using published experimental data pertaining to the shear-thinning and pressure-viscosity response of two fragile lubricants (L100 and LVI260), it has been demonstrated that the present model can explain the appearance of plateau in the experimental traction curve. Also, the influence of shear-thinning parameters and the pressure-viscosity coefficient on the predicted limiting shear stress zone has been studied.
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National Institute of Technology Kurukshetra,
e-mail: punkum2002@yahoo.co.in
Haryana 136119, India
e-mail: panuradhasachdeva@gmail.com
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April 2014
Research-Article
Elastohydrodynamic Lubrication Model With Limiting Shear Stress Behavior Considering Realistic Shear-Thinning and Piezo-Viscous Response
Punit Kumar,
National Institute of Technology Kurukshetra,
e-mail: punkum2002@yahoo.co.in
Punit Kumar
1
Department of Mechanical Engineering
,National Institute of Technology Kurukshetra,
Haryana 136119, India
e-mail: punkum2002@yahoo.co.in
1Corresponding author.
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Parinam Anuradha
Haryana 136119, India
e-mail: panuradhasachdeva@gmail.com
Parinam Anuradha
Department of Mechanical Engineering
,U.I.E.T., Kurukshetra University, Kurukshetra
,Haryana 136119, India
e-mail: panuradhasachdeva@gmail.com
Search for other works by this author on:
Punit Kumar
Department of Mechanical Engineering
,National Institute of Technology Kurukshetra,
Haryana 136119, India
e-mail: punkum2002@yahoo.co.in
Parinam Anuradha
Department of Mechanical Engineering
,U.I.E.T., Kurukshetra University, Kurukshetra
,Haryana 136119, India
e-mail: panuradhasachdeva@gmail.com
1Corresponding author.
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 29, 2013; final manuscript received November 24, 2013; published online January 20, 2014. Assoc. Editor: Dong Zhu.
J. Tribol. Apr 2014, 136(2): 021503 (8 pages)
Published Online: January 20, 2014
Article history
Received:
May 29, 2013
Revision Received:
November 24, 2013
Citation
Kumar, P., and Anuradha, P. (January 20, 2014). "Elastohydrodynamic Lubrication Model With Limiting Shear Stress Behavior Considering Realistic Shear-Thinning and Piezo-Viscous Response." ASME. J. Tribol. April 2014; 136(2): 021503. https://doi.org/10.1115/1.4026111
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