A direct comparison between experimental and numerical results for the passage of an array of 3D flat-top, square shaped surface features through an EHL point contact is presented. Results for pure rolling conditions show that the features’ deformation in the high-pressure region is governed by their ability to entrap lubricant both underneath and in the grooves during their passage through the inlet zone. Film perturbations associated with each defect occur as locally enhanced regions of lubricant and film thickness micro-constrictions. Under sliding conditions the features sustain further deformations as they traverse the high-pressure conjunction and meet the highly viscous lubricant entrapped in the grooves, which moves at a different velocity. Lubricant is also seen to accumulate just in front or behind the features depending on the slide-to-roll ratio. Overall, the results highlight the importance of understanding the effects of the defects structure and the lubricant rheology on the film thickness to unravel the effects of real roughness patterns.
Issue Section:
Technical Papers
1.
Venner, C. H., “Multilevel solution of the EHL line and point contact problems,” Ph.D. thesis, University of Twente, Enschede, The Netherlands, 1991, ISBN 90-9003974-0.
2.
Chang
, L.
, Cusano
, C.
, and Conry
, T. F.
, 1989
, “Effects of lubricant rheology and kinematic conditions on micro-elastohydrodynamic lubrication
,” ASME J. Tribol.
, 111
, pp. 344
–351
.3.
Ai
, X.
, and Cheng
, H. S.
, 1994
, “The influence of moving dent on point ehl contacts
,” STLE Tribol. Trans.
, 37
(2
), pp. 323
–335
.4.
Greenwood
, J. A.
, and Morales-Espejel
, G. E.
, 1994
, “The behavior of transverse roughness in ehl contacts
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 208
, pp. 121
–132
.5.
Venner, C. H., Couhier, F., Lubrecht, A. A., and Greenwood, J. A., 1997, “Amplitude reduction of waviness in transient ehl line contacts,” in Proceedings of the 1996 Leeds-Lyon Symposium on Tribology, D. Dowson, editor, Elsevier Science, New York, Vol. 32, pp. 103–111.
6.
Hooke
, C. J.
, 1998
, “Surface roughness modification in elastohydrodynamic line contacts operating in the elastic piezoviscous regime
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 212
, 145
–162
.7.
Hooke
, C. J.
, and Venner
, C. H.
, 2000
, “Surface roughness attenuation in line and point contacts
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, 439
–444
.8.
Venner, C. H., Kaneta, M., and Lubrecht, A. A., 2000, “Surface roughness in elastohydrodynamically lubricated contacts,” in Proceedings of the 1999 Leeds-Lyon Symposium on Tribology, Duncan Dowson, editor, Elsevier Science, New York, Vol. 38, pp. 25–36.
9.
Masen
, M. A.
, Venner
, C. H.
, Lugt
, P. M.
, and Tripp
, J. H.
, 2002
, “Effects of surface micro-geometry on the lift-off speed of an ehl contact
,” STLE Tribol. Trans.
, 45
, pp. 21
–30
.10.
Morales-Espejel
, G. E.
, Lugt
, P. M.
, Van Kuilenburg
, J.
, and Tripp
, J. H.
, 2003
, “Effects of surface micro-geometry on the pressures and internal stresses of pure rolling ehl contacts
,” STLE Tribol. Trans.
, 46
(2
), pp. 260
–272
.11.
Spikes
, H. A.
, 1999
, “Thin films in elastohydrodynamic lubrication: The contribution of experiment
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 213
, pp. 335
–352
.12.
Gohar
, R.
, and Cameron
, A.
, 1963
, “Optical measurement of oil film thickness under elastohydrodynamic lubrication
,” Nature (London)
, 200
, p. 458
458
.13.
Cusano
, C.
, and Wedeven
, L. D.
, 1982
, “The effects of artificially-produced defects on the film thickness in sliding ehd point contacts
,” ASLE Trans.
, 104
, 365
–375
.14.
Kaneta
, M.
, Sakai
, T.
, and Nishikawa
, H.
, 1992
, “Optical interferometric observations of the effects of a bump on point contact ehl
,” ASME J. Tribol.
, 114
, 779
–784
.15.
Gustafsson
, L.
, Ho¨glund
, E.
, and Marklund
, O.
, 1994
, “Measuring lubricant film thickness with image analysis
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 208
, 199
–205
.16.
Cann
, P. M.
, Hutchinson
, J.
, and Spikes
, H. A.
, 1996
, “The development of a spacer layer imaging method (slim) for mapping elastohydrodynamic contacts
,” Tribol. Trans.
, 39
, 915
–921
.17.
Guangteng, G., Cann, P. M., Spikes, H. A., and Olver, A. V., 1999, “Mapping of surface features in the thin film lubrication regime,” in Proceedings of the 1998 Leeds-Lyon Symposium on Tribology, Duncan Dowson, editor, Elsevier Science, New York, Vol. 37, pp. 175–183.
18.
Fe´lix-Quin˜onez
, A.
, Ehret
, P.
, Summers
, J. L.
, and Morales-Espejel
, G. E.
, 2004
, “Fourier analysis of a single transverse ridge passing through an ehl rolling contact: A comparison with experiment
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 218
, pp. 33
–43
.19.
Morales-Espejel
, G. E.
, Venner
, C. H.
, and Greenwood
, J. A.
, 2000
, “Kinematics of transverse real roughness in elastohydrodynamically lubricated line contacts using fourier analysis
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, pp. 523
–534
.20.
Ehret, P., Dowson, D., and Taylor, C. M., 1997, “Time-dependent solutions with waviness and asperities in ehl point contacts,” in Proceedings of the 1996 Leeds-Lyon Symposium on Tribology, Duncan Dowson, editor, Elsevier Science, New York, Vol. 32, pp. 313–324.
21.
Guangteng
, G.
, Cann
, P. M.
, Olver
, A. V.
, and Spikes
, H. A.
, 2000
, “Lubricant film thickness in rough surface, mixed elastohydrodinamic contact
,” ASME J. Tribol.
, 122
, pp. 65
–76
.22.
Ehret, P., Fe´lix-Quin˜onez, A., Lord, J., Larsson, R., and Marklund, O., 2000, “Experimental analysis of micro-elastohydrodynamic conditions,” in Proceedings of the International Tribology Conference, Oct 29–Nov 2, ITC Nagasaki 2000, Japanese Society of Tribologists, editor, Tokyo, Japan, pp. 621–624.
23.
Choo
, J. W.
, Glovnea
, R. P.
, Olver
, A. V.
, and Spikes
, H. A.
, 2003
, “The effects of three-dimensional model surface roughness features on lubricant film thickness in ehl contacts
,” ASME J. Tribol.
, 125
, pp. 533
–542
.24.
Olver, A. V., Guangteng, G., and Spikes, H. A., 2000, “Film thickness and pressure in micro-ehd contacts,” in Proceedings of the 1999 Leeds-Lyon Symposium on Tribology, Duncan Dowson et al., editor, Elsevier Science, New York, Vol. 38, pp. 503–510.
25.
Venner, C. H., Kaneta, M., Nishikawa, H., and Jacod, B., 2000, “Effects of waviness on the film thickness in a circular ehl contact under rolling/sliding,” in Proceedings of the International Tribology Conference, Oct 29–Nov 2, ITC Nagasaki 2000, Japanese Society of Tribologists, editor, Tokyo, Japan, pp. 631–636.
26.
Greenwood
, J. A.
, and Johnson
, K. L
, 1992
, “The behavior of transverse roughness in ehl contacts
,” Wear
, 153
, pp. 107
–117
.27.
Hooke
, C. J.
, 2000
, “The behavior of low-amplitude surface roughness under line contacts: non-newtonian fluids
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, pp. 253
–265
.28.
Jacod
, B.
, Lugt
, P. M.
, Dumont
, M. L.
, Tripp
, J. H.
, and Venner
, C. H.
, 2000
, “Amplitude reduction of waviness in elastohydrodynamic lubrication using an eyring fluid model
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, pp. 343
–350
.29.
Fe´lix-Quin˜onez
, A.
, Ehret
, P.
, and Summers
, J. L.
, 2003
, “New experimental results of a single ridge passing through an ehl conjunction
,” ASME J. Tribol.
, 125
, pp. 252
–259
.30.
Fe´lix-Quin˜onez
, A.
, Ehret
, P.
, and Summers
, J. L.
, 2004
, “Numerical analysis of experimental observations of a single transverse ridge passing through an ehl point contact under rolling/sliding conditions
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 218
, pp. 109
–123
.31.
Chang
, L.
, Jackson
, A.
, and Webster
, M. N.
, 1994
, “Effects of 3-d surface topography on the ehl film thickness and film breakdown
,” STLE Tribol. Trans.
, 37
, pp. 435
–444
.32.
Dowson
, D.
, and Ehret
, P.
, 1999
, “Past, present and future studies in elastohydrodynamics
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 213
, pp. 317
–334
.33.
Lugt
, P. M.
, Severt
, R. W. M.
, Fogelstro¨m
, J.
, and Tripp
, J. H.
, 2001
, “Influence of surface topography on friction, film breakdown and running-in in the mixed lubrication regime
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 215
, pp. 519
–533
.34.
Kaneta
, M.
, and Cameron
, A.
, 1980
, “Effects of asperities in elastohydrodynamic lubrication
,” ASME J. Lubr. Technol.
, 102
, pp. 374
–379
.35.
Greenwood
, J. A.
, 2000
, “Two-dimensional flow of a non-newtonian lubricant
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, pp. 29
–41
.36.
Ehret
, P.
, Dowson
, D.
, and Taylor
, C. M.
, 1998
, “On lubricant transport conditions in elastohydrodynamic conjunctions
,” Proc. R. Soc. London, Ser. A
, 454
, pp. 763
–787
.37.
Dowson D., and Higginson, G. R., 1966, Elasto-Hydrodynamic Lubrication, The Fundamentals of Roller and Gear Lubrication, Pergamon Press, Oxford, United Kingdom.
38.
Roelands, C., 1966, “Correlational Aspects of the Viscosity-Temperature-Pressure relationship of Lubricant Oils,” Ph.D. thesis, Delft University (VRB Groningen), Delft, The Netherlands.
39.
Lubrecht
, A. A.
, and Venner
, C. H.
, 1999
, “Elastohydrodynamic lubrication of rough surfaces
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 213
, pp. 397
–404
.40.
Larsson
, R.
, Larsson
, P. O.
, Eriksson
, E.
, Sjo¨berg
, M.
, and Ho¨glund
, E.
, 2000
, “Lubricant properties for input to elastohydrodynamic lubrication analyses
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 214
, pp. 17
–27
.41.
Marklund
, O.
, and Gustafsson
, L.
, 1999
, “Correction for pressure dependence of the refractive index in measurements of lubricant film thickness with image analysis
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 213
, pp. 109
–126
.42.
Glovnea
, R. P.
, Choo
, J. W.
, Olver
, A. V.
, and Spikes
, H. A.
, 2003
, “Compression of a single ridge in a circular elastohydrodynamic contact
,” ASME J. Tribol.
, 125
, pp. 275
–282
.Copyright © 2005
by ASME
You do not currently have access to this content.
