In previous work it was shown that some functionalized polymers used as viscosity index improvers are able to form thick boundary lubricating films. This behavior results from adsorption of the polymer on metal surfaces to form a layer of enhanced viscosity adjacent to the surface. In the current work the behavior of one such polymer in rough surface contact conditions is studied, using both model and real rough surfaces. It is found that the polymer is able to form a thick boundary film in rough surface contact, just as it does with smooth surfaces. It is also shown that the effect of this boundary film is to significantly reduce friction in rolling-sliding, rough surface, lubricated contact.
Issue Section:
Technical Papers
1.
Standard methods for analysis and testing of petroleum and related products 1992, Vol. 1, p. 226.
2.
Selby
, T. W.
, 1959
, “The non-Newtonian characteristics of lubricating oils
,” ASLE Trans.
, 1
, pp. 68
–81
.3.
McMillan, M. L. and Murphy, C. K. (1978), “Temporary viscosity loss and its relationship to journal bearing performance,” SAE Technical Papers, 780374.
4.
Spikes
, H. A.
, Cann
, P. M.
, Coy
, R. C.
, and Wardle
, R. W. M.
, 1990
, “An ‘in lubro’ study of VI Improvers in EHD contacts
,” Int. J. Phys. Distribut. Logist. Manage.
, 3
, pp. 45
–62
.5.
Smeeth
, M.
, Spikes
, H. A.
, and Gunsel
, S.
, 1996
, “The formation of viscous surface films by polymer solutions: Boundary or elastohydrodynamic lubrication?
” Tribol. Trans.
, 39
, pp. 720
–725
.6.
Smeeth
, M.
, Spikes
, H. A.
, and Gunsel
, S.
, 1996
, “Boundary film formation by viscosity index improvers
,” Tribol. Trans.
, 39
, pp. 726
–734
.7.
Guangteng
, G.
, Smeeth
, M.
, Cann
, P. M.
, and Spikes
, H. A.
, 1996
, “The measurement and modelling of the boundary film properties of polymeric lubricant additives
,” Proc. Inst. Mech. Eng., Part J: J. Eng. Tribol.
, 210
, pp. 1
–15
.8.
Smeeth, M., Gunsel, S., and Spikes, H. A. 1996 “Friction and wear reduction by boundary film-forming viscosity index improvers,” SAE Technical Paper, SAE 962037.
9.
Dardin, A., Muller, M., Topolovec-Miklozic, K., and Spikes, H. A., 2003, “Influence of polyalkylmethacrylate viscosity index improvers on the efficiency of lubricants,” presented at JSAE, Yokohama, JSAE 20030220, SAE 2003-01-1967.
10.
Topolovec-Miklozic, K., and Spikes, H. A., 2003, “Application of atomic force microscopy to the study of lubricant additive films,” in ASME Trans., J. of Tribology (to be published).
11.
Guangteng
, G.
, Cann
, P. M.
, Olver
, A. V.
, and Spikes
, H. A.
, 2000
, “Lubricant film thickness in rough surface, mixed elastohydrodynamic contact
,” Trans. ASME, J. Tribol.
, 122
, pp. 65
–76
.12.
Johnston
, G. J.
, Wayte
, R. C.
, and Spikes
, H. A.
, 1991
, “The measurement and study of very thin lubricant films in concentrated contacts
,” Tribol. Trans.
, 34
, pp. 187
–194
.13.
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
, pp. 915
–921
.14.
Glovnea
, R. P.
, Choo
, J. W.
, Olver
, A. V.
, and Spikes
, H. A
, 2003
, “Compression of a single transverse ridge in a circular elastohydrodynamic contact
,” Trans. ASME, J. Tribol.
, 125
, pp. 275
–282
.15.
Hirst
, W.
, and Hollander
, A. E.
, 1974
, “Surface Finish and Damage in Sliding
,” Proc. R. Soc. London, Ser. A
, 337
(1610
), pp. 379
–394
.16.
Whitehouse
, D. J.
, and Archard
, J. F.
, 1970
, “The Properties of Random Surfaces of Significance in their Contact
,” Proc. R. Soc. London, Ser. A
, 316
(1524
), pp. 97
–121
.17.
Greenwood
, J. A.
, and Williamson
, J. B. P.
, 1966
, “Contact of Nominally Flat Surfaces
,” Proc. R. Soc. London, Ser. A
, 295
(1442
), pp. 300
–319
.18.
M. Smeeth, “The Behaviour of Viscosity Index Improvers in Lubricated Contacts,” Ph.D. thesis, University of London, 1998.
19.
Hamrock, B. J., and Dowson, D., 1981, Ball Bearing Lubrication: The Elastohydrodynamics of Elliptical Contacts, Wiley, NY.
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