The effect of surface texture on EHL point contact is studied numerically by using the multigrid method. Numerical simulations have been performed for waviness and random roughness with three different orientations, transverse, oblique and longitudinal. Results reveal a strong domination of unidirectional Couette flow in the EHL conjunction. The geometrical variations at inlet of the contact are transported downstream throughout the EHL conjunction. As a consequence, the oblique surface roughness striations are largely distorted, forming nearly longitudinal wavy passages. Results show that the oblique roughness induces local three dimensional EHL pressure fluctuations. The maximum pressure is higher than that of the transverse roughness. For sinusoidal waviness, oblique orientation gives the smallest minimum film thickness as compared with those of longitudinal and transverse waviness.

1.
Ai, X., 1993, “Numerical Analyses of Elastohydrodynamically Lubricated Line and Point Contacts with Rough Surfaces By Using Semi-System and Multigrid Methods,” Ph.D. dissertation, Northwestern University, Evanston, IL.
2.
Ai
X.
, and
Cheng
H. S.
,
1994
a, “
A Transient EHL Analysis for Line Contacts with Measured Surface Roughness Using Multigrid Technique
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
116
, pp.
549
558
.
3.
Ai
X.
, and
Cheng
H. S.
,
1994
b, “
The Influence of Moving Dent on Point EHL Contacts
,”
STLE Tribology Transaction
, Vol.
37
, pp.
323
335
.
4.
Chang
L.
, and
Webster
M. N.
,
1991
, “
A Study of Elastohydrodynamically Lubrication of Rough Surfaces
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
103
, pp.
110
115
.
5.
Christensen
H.
,
1969-70
, “
Stochastic Models for Hydrodynamic Lubrication of Rough Surfaces
,”
Proc. Instn. Mech. Engrs.
, Vol.
184
, Part 1, No.
55
, pp.
1013
1026
.
6.
Elrod
H. G.
,
1973
, “
Thin-Film Lubrication Theory for Newtonian Fluids Possessing Striated Roughness or Grooving
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
93
, No.
3
, pp.
324
330
.
7.
Goglia
P. R.
,
Cusano
C.
, and
Conry
T. F.
,
1984
, “
The Effects of Surface Irregularities on the Elastohydrodynamic Lubrication of Sliding Line Contacts, Part II—Wavy Surfaces
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
106
, pp.
113
119
.
8.
Greenwood
J. A.
, and
Johnson
K. L.
,
1992
, “
The Behavior of Transverse Roughness in Sliding Elastohydrodynamically Lubricated Contacts
,”
Wear
, Vol.
153
, pp.
107
117
.
9.
Greenwood, J. A., and Morales-Espejel, G. E., 1994, “The Behavior of Real Transverse Roughness in a Sliding EHL Contact,” to appear in I. Mech. E. Journal of Engineering Tribology.
10.
Karami
G.
,
Evans
H. P.
, and
Sindle
R. W.
,
1987
, “
Elastohydrodynamic Lubrication of Circumferentially Finished Rollers Having Sinusoidal Roughness
,”
Proc. Instn. Mech. Engrs.
, Vol.
201
, pp.
29
36
.
11.
Kaneta
K.
,
1992
, “
Effects of Surface Roughness in Elastohydrodynamic Lubrication
,”
JSME, International Journal
, Series III, Vol.
35
, No.
4
, pp.
535
546
.
12.
Kweh
C. C.
,
Evans
H. P.
, and
Sindle
R. W.
,
1989
,
Micro-Elastohydrodynamic Lubrication of An Elliptical Contact with Transverse and Three-Dimensional Roughness
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
111
, pp.
577
584
.
13.
Kweh, C. C., Patchong, M. J., Evans, H. P., and Snidle, R. W., 1991, “Simulation of Elastohydrodynamic Contacts Between Rough Surfaces,” ASME JOURNAL OF TRIBOLOGY, Preprint, 91-Trib-36.
14.
Ling
B. F.
,
Evans
H. P.
, and
Snidle
R. W.
,
1989
, “
Micro-Elastohydrodynamic Lubrication of Circumferentially Finished Rollers
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
111
, pp.
730
736
.
15.
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
.
16.
Lubrecht, A. A., and Venner, C. H., 1993, “Aspects of Two-Sided Surface Waviness in an EHL Line Contact,” Proc. of the 25th Leeds-Lyon Symposium on Tribology, pp. 205–214.
17.
Seabra
J.
, and
Berthe
D.
,
1989
, “
Elastohydrodynamic Point Contacts Part II: Influence of Surface Speeds, Surface Waviness and Load on the Contact Behavior
,”
Wear
, Vol.
130
, pp.
319
335
.
18.
Sadeghi
F.
,
1991
, “
A Comparison of the Fluid Models Effects on the Internal Stresses of Rough Surfaces
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
113
, No.
1
, pp.
142
149
.
19.
Tonder
K.
,
1977
, “
Mathematical Verification of the Applicability of Modified Reynolds Equation to Striated Rough Surfaces
,”
Wear
, Vol.
44
, No.
2
, pp.
329
343
.
20.
Venner
C. H.
, and
ten Napel
W. E.
,
1992
, “
Surface Roughness Effects in an EHL Line Contact
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
114
, No.
3
, pp.
616
622
.
21.
Venner, C. H., 1991, “Multigrid Solution of the EHL Line and Point Contact Problems,” Ph.D. thesis, University of Twente, Enschede, The Netherlands.
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