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Keywords: EHL
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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
...Zhang Shengguang; Wang Wenzhong; Zhao Ziqiang The combined model for lubrication and inclusion problems is solved following the flowchart given in Fig. 1 . It consists of two parts, one for EHL and another for inclusion problem; they are connected by surface disturbed displacement. Liu et...
Journal Articles
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
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
...: Dong Zhu. 06 05 2012 02 11 2012 The dynamic behaviors of a single elastohydrodynamic 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...
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
... 07 08 2008 elastodynamics hydrodynamics liquid films lubrication mechanical contact point contacts rolling thin films EHL shear thinning Carreau point contact correction factor The accurate prediction of lubricant film thickness and traction coefficient...
Journal Articles
Article Type: Research Papers
J. Tribol. October 2008, 130(4): 041802.
Published Online: August 7, 2008
... compressibility is an exception. Recently, EHL simulations ( 19 20 21 ) using realistic viscosity have achieved an excellent agreement with experimental film thickness and even traction, although the pressures in these simulations were low ( ∼ 0.5 GPa ) . The modeling of viscosity...
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
... 05 08 2008 cavitation computational fluid dynamics convection elasticity evaporation heat conduction hydrodynamics lubrication Navier-Stokes equations rolling friction shear flow sliding friction viscosity EHL elastohydrodynamic CFD cavitation Navier–Stokes Reynolds...
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
... configuration of the surface topography is that both surfaces are with longitudinal waviness. 20 04 2007 22 04 2008 01 08 2008 elastodynamics hydrodynamics lubrication point contacts steel surface topography surface waviness EHL thermal non-Newtonian...
Journal Articles
Article Type: Research Papers
J. Tribol. July 2008, 130(3): 031502.
Published Online: June 23, 2008
... viscosity cavitations starvation EHL MLMG simulation point contact reciprocating Elastohydrodynamic lubricated (EHL) machine elements working under reciprocating motions are very common in mechanical applications. The lubrication state of these machine elements is often influenced...
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...
Journal Articles
Article Type: Research Papers
J. Tribol. April 2008, 130(2): 021301.
Published Online: March 3, 2008
... immediately before scuffing occurred or the value at the maximum load achieved in an experiment that did not scuff. The roughness values given are the average of four measurements taken in the circumferential direction at four equally spaced positions around each disk. The minimum EHL film thickness shown...