Time dependent thermal EHL circular contact results with measured surface roughness were obtained to analyze the effects of roughness on pressure, film thickness, temperature, and coefficient of friction. Both contact surfaces are considered to be rough. Multilevel multigrid techniques (with multigrid integration) were used to solve the system of two dimensional Reynolds, elasticity and three dimensional energy equations simultaneously. The effects of surface roughness under various loads, speeds, and slip conditions have been studied. Surface roughness causes pressure and temperature spikes and increases the coefficient of friction, and surface roughness flattens due to the high pressure in EHL contact. The higher the load, speed and slide to roll ratio, the more significant the effect of the surface roughness. A comparison between rough EHL and smooth EHL results indicates that surface roughness cannot be ignored in EHL analysis.

1.
Ai
X.
, and
Cheng
H. S.
,
1994
, “
A Transient EHL Analysis for Line Contacts With Measured Surface Roughness Using Multigrid Technique
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
116
, pp.
549
558
.
2.
Chang
L.
, and
Webster
M. N.
,
1991
, “
A Study of Elastohydrodynamic Lubrication of Rough Surfaces
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
113
, pp.
110
113
.
3.
Elrod
H. G.
,
1979
, “
A General Theory for Laminar Lubrication with Reynolds Roughness
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
1979
, pp.
8
14
.
4.
Greenwood
J. A.
, and
Morales-Espejel
G. E.
,
1994
, “
The Behavior of Transverse Roughness in EHL Contacts
,”
Proceedings: Institutional of Mechanical Engineers
, Part J, Vol.
208
, pp.
121
132
.
5.
Jackson
A.
, and
Cameron
A.
,
1974
, “
An Interferometric Study of the EHL of Rough Surfaces
,”
ASLE Transactions
, Vol.
19
, No.
1
, pp.
50
60
.
6.
Kaneta, M., and Cameron, A., 1980 “Effects of Asperities in Elastohydrodynamic Lubrication,” ASME Paper, 79-Lub-6.
7.
Kweh
C. C.
,
Patching
M. J.
,
Evans
H. P.
, and
Snidle
R. W.
,
1992
, “
Simulation of Elastohydrodynamic Contacts Between Rough Surfaces
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, pp.
412
419
.
8.
Kim
K-H.
, and
Sadeghi
F.
,
1992
(a), “
Three-Dimensional Temperature Distribution in EHD Lubrication: Part 1—Circular Contact
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, pp.
32
41
.
9.
Kim
K-H.
, and
Sadeghi
F.
,
1992
(b), “
Non-Newtonian Elastohydrodynamic Lubrication of Point Contact
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
113
, pp.
703
711
.
10.
Kim, K-H., 1993 “Thermal Effects in Elastohydrodynamic Lubrication of Circular and Elliptic Contacts,” Ph.D. thesis, Purdue University, West Lafayette, USA.
11.
Lubrecht
A. A.
,
Ten Napel
W. E.
, and
Bosma
R.
,
1988
, “
The Influence of Longitudinal and Transverse Roughness on the Elastohydrodynamic Lubrication of Circular Contacts
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
110
, pp.
421
426
.
12.
Patir
N.
, and
Cheng
H. S.
,
1978
, “
An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
100
, pp.
12
17
.
13.
Sui
P. C.
, and
Sadeghi
F.
,
1991
, “
Non-Newtonian Thermal Elastohydrodynamic Lubrication
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
113
, pp.
390
397
.
14.
Roelands, C. J. A., 1966 “Correlation Aspects of the Viscosity-Temperature-Pressure Relationship of Lubricating Oils,” Ph.D. thesis, Technical University Delft, Delft, The Netherlands.
15.
Sadeghi, F., 1990 “A Comparison of the Fluid Models Effects on the Internal Stresses of Rough Surfaces,” ASME paper, 90-Trib-6.
16.
Sadeghi
P.
, and
Sui
P. C.
,
1990
, “
Thermal Elastohydrodynamic Lubrication of Rolling/Sliding Contacts
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
112
, pp.
189
195
.
17.
Tripp
J. H.
, “
Surface Roughness Effects in Hydrodynamic Lubrication: The Flow Factor Method
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
105
, pp.
458
465
.
18.
Venner
C. H.
, and
Lubrecht
A. A.
,
1994
, “
Transient Analysis of Surface Features in an EHL Line Contact in the Case of Sliding
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
116
, pp.
186
193
.
19.
Venner, C. H., 1991 “Multilevel Solution of the Line and Point Contact Problems,” Ph.D. thesis, University of Twente, Enschede, The Netherlands.
20.
Zhou
R. S.
,
1993
, “
Surface Topography and Fatigue Life of Rolling Contact Bearings
,”
STLE Tribology Transactions
, Vol.
36
, No.
3
, pp.
329
340
.
This content is only available via PDF.
You do not currently have access to this content.