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Keywords: EHL
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Journal Articles
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
Article Type: Research-Article
J. Tribol. October 2014, 136(4): 041504.
Paper No: TRIB-14-1029
Published Online: August 4, 2014
... of elastohydrodynamic lubricated (EHL) lubricants compared to the conventional pressure–viscosity coefficient. Comparisons between simulated, curve-fitted values, and experimental results validate both the employed numerical approach and rheological model. EHL shear thinning Carreau point contact film...
Journal Articles
Article Type: Research-Article
J. Tribol. October 2014, 136(4): 041501.
Paper No: TRIB-14-1041
Published Online: June 19, 2014
... under lubrication environment. So far the numerical algorithms to solve 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...
Journal Articles
Article Type: Research-Article
J. Tribol. July 2014, 136(3): 031502.
Paper No: TRIB-13-1180
Published Online: May 6, 2014
...Li-Ming Chu; Chien-Yu Chen; Chin-Ke Tee; Qie-Da Chen; Wang-Long Li In the development of an EHL coated surfaces in point contact problem (Fig. 1 ), a modal problem is defined and analyzed in the following section. The modal problem consists of a rigid ball in contact with a smooth coated flat...
Journal Articles
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
Article Type: Research-Article
J. Tribol. April 2013, 135(2): 021501.
Paper No: TRIB-12-1072
Published Online: December 26, 2012
... lubricated (EHL) contact between a rolling element and raceways under wider load and speed ranges are analyzed numerically based on the transient EHL model and the free vibration model. The discrete convolution and fast fourier transform method is implemented in order to increase the computational efficiency...
Journal Articles
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
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
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
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
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
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041506.
Published Online: August 7, 2008
... thin films EHL shear thinning Carreau point contact correction factor The accurate prediction of lubricant film thickness and traction coefficient in elastohydrodynamic lubrication (EHL) of nonconformal contacts has been the focus of attention for over the past five decades. Earlier...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041802.
Published Online: August 7, 2008
... , P. , and Wang , J. , 2002 , “ Thermal Effects on the Film Thickness in Elliptic EHL Contacts With Entrainment Along the Major Contact Axis ,” ASME J. Tribol...
Journal Articles
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
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041503.
Published Online: August 5, 2008
...-thinning across the film. For a CFD approach the shear-rate dependency can be expressed locally. In Eq. 28 the elastic component is dropped, as Bair et al. ( 35 ) have shown that a time dependency in the viscous response for an EHL-contact is unlikely. That leads to 29 γ ̇ = τ 0 η 0...
Journal Articles
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
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041502.
Published Online: August 1, 2008
... in wavelength or the decrease in waviness amplitude, the cyclic solution can approach the steady-state solution gradually. Such a comparison also suggests that, in general, the existence of surface waviness is harmful to an EHL point contact, although it may be beneficial in a contact pair composed of two...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2008, 130(3): 031502.
Published Online: June 23, 2008
...) No reference values exist for cavity length. However, the calculated film thicknesses, even when using a large domain, agree with standard EHL film thickness formulas. Figure 8 shows lines of central film thickness calculated by the Hamrock and Dowson equation, as found in Hamrock ( 21 ) for the piezoviscous...
Journal Articles
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
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...