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Keywords: EHL
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Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. May 2023, 145(5): 054102.
Paper No: TRIB-22-1084
Published Online: January 9, 2023
... reducer, thorough comprehension of the reducer’s tribological behavior is required. To this end, the elastohydrodynamic lubrication (EHL) theory, for the first time, is used to reveal the tribological behavior of the planer ball reducer, and the equations of kinematics, EHL model, and theoretical...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Tribol. October 2014, 136(4): 041504.
Paper No: TRIB-14-1029
Published Online: August 4, 2014
...Puneet Katyal; Punit Kumar The analysis presented in Sec. 2.1 uses finite difference method to model the complete EHL rolling/sliding point contact system operating with non-Newtonian lubricants. The mathematical model, which includes the viscosity and density variation due to pressure rise...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Tribol. October 2014, 136(4): 041501.
Paper No: TRIB-14-1041
Published Online: June 19, 2014
... lubrication problems without the consideration of inhomogeneities or inclusions are well developed. In this paper, the combination of elastohydrodynamic lubrication (EHL) and inclusion problem is realized to consider the effect of material inhomogeneity on the lubrication performance and subsurface stress...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Tribol. July 2014, 136(3): 031502.
Paper No: TRIB-13-1180
Published Online: May 6, 2014
... May 6, 2014. Assoc. Editor: Dong Zhu. 01 09 2013 24 02 2014 The effects of the transversely isotropic coating layer on the elastohydrodynamic lubrication (EHL) circular contact problems are analyzed and discussed under constant load condition. The equivalent elastic modulus...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Tribol. April 2014, 136(2): 021503.
Paper No: TRIB-13-1111
Published Online: January 20, 2014
.... 29 05 2013 24 11 2013 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...
Journal Articles
Publisher: ASME
Article Type: Research-Article
J. Tribol. April 2013, 135(2): 021501.
Paper No: TRIB-12-1072
Published Online: December 26, 2012
... by the initial excitation. The energy dissipated in the EHL contact is mainly influenced by the squeeze motion of the film. The variations of damping with load at different speeds are drawn in Fig. 11 . It is shown that with the increase of load, the damping first decreases, then increases and subsequently...
Journal Articles
Publisher: ASME
Article Type: Elastohydrodynamic Lubrication
J. Tribol. July 2012, 134(3): 031502.
Published Online: June 18, 2012
...Li-Ming Chu; Jaw-Ren Lin; Wang-Long Li; Jian-Ming Lu The coupled extended Reynolds (which includes the effects of Navier-slip and flow rheology), elasticity deformation, and the load equilibrium (under a constant load condition) equations are solved simultaneously for the EHL problems. Results show...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2011, 133(4): 041001.
Published Online: August 9, 2011
...Dong Zhu; Q. Jane Wang Elastohydrodynamic Lubrication (EHL) is commonly known as a mode of fluid-film lubrication in which the mechanism of hydrodynamic film formation is enhanced by surface elastic deformation and lubricant viscosity increase due to high pressure. It has been an active...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Tribol. October 2009, 131(4): 044501.
Published Online: September 21, 2009
...Yuchuan Liu; Q. Jane Wang; Dong Zhu; Wenzhong Wang; Yuanzhong Hu This paper discussed the computational accuracy of rough-surface point-contact isothermal elastohydrodynamic lubrication (EHL) analysis by investigating the effects of differential scheme, viscosity-pressure, and shear-thinning models...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. January 2009, 131(1): 011802.
Published Online: December 4, 2008
...Punit Kumar; M. M. Khonsari; Scott Bair The Eyring sinh law, which is the most widely used model to describe the shear-thinning behavior of elastohydrodynamic lubrication (EHL) lubricants, fails to replicate the experimentally measured flow curves for shear-thinning lubricants. Interestingly...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. January 2009, 131(1): 011503.
Published Online: December 4, 2008
...Punit Kumar; M. M. Khonsari This paper investigates the traction behavior in heavily loaded thermo-elastohydrodynamic lubrication (EHL) line contacts using the Doolittle free-volume equation, which closely represents the experimental viscosity-pressure-temperature relationship and has recently...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041506.
Published Online: August 7, 2008
... correction factors are developed to account for the shear-thinning behavior of lubricants in EHL circular contacts under pure rolling. The corrected film thickness can be easily obtained by dividing the Newtonian film thickness by the correction factor, which is a function of inlet Weissenberg number...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041505.
Published Online: August 6, 2008
...Punit Kumar; M. M. Khonsari The combined influence of shear thinning and viscous heating on the behavior of film thickness and friction in elastohydrodynamic lubrication (EHL) rolling/sliding line contacts is investigated numerically. The constitutive equation put forward by Carreau is incorporated...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041503.
Published Online: August 5, 2008
... share the same pressure and temperature locally. Furthermore, it is numerically essential to model the conduction term implicitly, since the energy balance in an EHL-contact is dominated by viscous heating and conduction. Temperature only feeds back into the fluid solution via the temperature dependency...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041504.
Published Online: August 5, 2008
...Ilya I. Kudish; P. Kumar; M. M. Khonsari; Scott Bair The estimation or prediction of elastohydrodynamic lubrication (EHL) film thickness requires knowledge of the lubricant properties. Today, in many instances, the lubricant properties have been obtained from a measurement of the central film...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. July 2008, 130(3): 031502.
Published Online: June 23, 2008
... observations and a numerical parametric study, an equation for the cavity length in an EHL rolling point contact was developed. The equation is only valid for enclosed type cavities (enclosed in the oil meniscus). For the time being, the usage of the equation is mainly limited to rolling motion...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. July 2008, 130(3): 031501.
Published Online: June 20, 2008
... and coating thickness on lubricant film thickness are investigated based on a point-contact isothermal elastohydrodynamic lubrication (EHL) model developed recently by the authors. The results present the trend of minimum film thickness variation as a function of coating thickness and elastic modulus under...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Tribol. April 2008, 130(2): 021502.
Published Online: March 20, 2008
... polymer additives are often added to the base oil. This paper investigates the effect of mixture rheology on elastohydrodynamic lubrication (EHL) film thickness using EHL contact measurements and a full numerical analysis for three synthetic lubricants including two single-component lubricants PAO650...