This article describes the mechanism of variations of elastohydrodynamic lubricated oil film under high slip ratio conditions. Experiments were conducted using a ball-on-disc apparatus. The thickness of the oil film was measured by optical interferometry. Temperature increase in the ball surface, disc surface, and oil film was determined by an improved infrared technique using a transparent disc without any coating and non-transparent disc with a comparatively thick Cr coating. The results reveal that the film thickness decreases with an increase in the slip ratio at constant entrainment velocities. The shape of the oil film indicates an increase in the thickness gradient at the inlet region and a slight increase in the oil film just behind the exit region. The temperature at the inlet region increases with the slip ratio and entrainment speed. Both the inlet region and the contact area exhibit a significant temperature difference between the surfaces. The variation of the shape of the oil film can be explained on the basis of the viscosity wedge action. The viscosity wedge action, heating at the inlet region, and inflow of heat from a slower surface to the inlet region reduce the film thickness considerably.
ChengH. S.OrcuttF. K.A correlation between the theoretical and experimental results on the elastohydrodynamic lubrication of rolling and sliding contactsProc. Instn Mech. Engrs, Part B: J. Engineering Manufacture, 1965-66, 180, 158–168.
2.
SafaM. M. A.AndersonJ. C.LeatherJ. A.Transducers for pressure, temperature and oil film thickness measurement in bearingsSens. Actuators, 1982-83, 3, 119–128.
3.
KannelJ. W.ZugaroF. F.DowT. A.A method for measuring surface temperature between rolling/sliding steel cylindersTrans. ASME J. Lubr. Technol., 1978, 100, 110–114.
4.
KannelJ. W.DowT. A.The relation between pressure and temperature in rolling-sliding EHD contactASLE Trans., 1980, 23, 262–268.
5.
TurchinaV.SanbornD. M.WinerW. O.Temperature measurements in sliding elastohydrodynamic point contactsTrans. ASME J. Lubr. Technol., 1974, 96, 464–471.
6.
AushermanV. K.NagarajH. S.SanbornD. M.WinerW. O.Infrared temperature mapping in elastohydrodynamic lubricationTrans. ASME J. Lubr. Technol., 1976, 98, 236–243.
7.
CrookA. W.The lubrication rollers IPhilos. Trans. R. Soc. Lond., Ser. A, 1958, 252, 387–409.
8.
ChengH. S.SternlichtB.A numerical solution for the pressure, temperature, and film thickness between two infinitely long, lubricated rolling and sliding cylinders, under heavy loadsTrans. ASME J. Basic Eng., 1965, 87, 695–707.
9.
ChengH. S.A refined solution to the thermal-elastohydrodynamic lubrication of rolling and sliding cylindersASLE Trans., 1965, 8, 397–410.
10.
DowsonD.WhitakerA. V.A numerical procedure for the solution of the elastohydrodynamic problem of rolling and sliding contacts lubricated by a newtonian fluidProc. Instn Mech. Engrs, Part B: J. Engineering Manufacture, 1965-66, 180, 57–71.
11.
GreenwoodJ. A.KauzlarichJ. J.Inlet shear heating in elastohydrodynamic lubricationTrans. ASME J. Lubr. Technol., 1973, 95, 417–426.
12.
MurchL. E.WilsonW. R. D.A thermal elastohydrodynamic inlet zone analysisTrans. ASME J. Lubr. Technol., 1975, 97, 212–216.
13.
WilsonW. R.D.SheuS.Effect of inlet shear heating due to sliding on elastohydrodynamic film thicknessTrans. ASME J Lubr. Technol., 1983, 105, 187–188.
14.
DalmazG.Film thickness and traction measurements in small elastohydrodynamic elliptical contacts.In Proceedings of the 5th Leeds-Lyon Symposium on Tribology, September 1978 (Eds DowsonD.), 1979, pp. 71–80 (Mechanical Engineering Publications Limited, London).
15.
DalmazG.ChaomleffelJ. P.Elastohydrodynamic lubrication of point contacts for various lubricants.In Proceedings of the 13th Leeds-Lyon Symposium on Tribology, September 1986, Elsevier Tribology Series (Eds DowsonD.), 1987, vol. 11, pp. 207–218 (Elsevier, Amsterdam).
16.
BrüggemannH.KollmannF. G.A numerical solution of the thermal elastohydrodynamic lubrication in an elliptical contactTrans. ASME J. Lubr. Technol., 1982, 104, 392–400.
17.
YangP. A.WenS.Generalized Reynolds equation for non-Newtonian thermal elastohydrodynamic lubricationTrans. ASME J. Tribol., 1990, 112, 631–636.
18.
MaM. T.An expedient approach to the non-Newtonian thermal EHL in heavily loaded point contactsWear, 1997, 206, 100–112.
19.
SmeethH.SpikesH.The influence of slide/roll ratio on the film thickness of an EHD contact operating within the mixed lubrication regime.In Proceedings of the 22nd Leeds-Lyon Symposium on Tribology, September 1995, Elsevier Tribology Series (Eds DowsonD.), 1996, vol. 31, pp. 695–703 (Elsevier, Amsterdam).
20.
JubaultI.MolimardJ.LubrechtA. A.MonsotJ. L.VergneP.In situ pressure and film thickness measurements in rolling/sliding lubricated contactsTribol. Lett., 2003, 15, 421–429.
21.
WangS.CornyT. F.CusanoC.Thermal non-Newtonian elastohydrodynamic lubrication of line contacts under simple sliding conditionsTrans. ASME J. Tribol., 1992, 114, 317–327.
22.
LeeR. T.HsuC. H.Advanced multilevel solution for thermal elastohydrodynamic lubrication of simple sliding line contactsWear, 1994, 171, 227–237.
23.
KimH. J.EhretP.DowsonD.TaylorC. M.Thermal elastohydrodynamic analysis of circular contacts part 1: Newtonian modelProc. Instn Mech. Engrs, Part J: J. Engineering Tribology, 2001, 215, 339–352.
24.
KimH. J.EhretP.DowsonD.TaylorC. M.Thermal elastohydrodynamic analysis of circular contacts part 2: Non-Newtonian modelProc. Instn Mech. Engrs, Part J: J. Engineering Tribology, 2001, 215, 353–362.
NagarajH. S.SanbornD. M.WinerW. O.Surface temperature measurements in rolling and sliding EHD contactsASLE Trans., 1979, 22, 277–285.
27.
WedevenL. D.Discussion to Najaraj's paperASLE Trans., 1979, 22, 285.
28.
SanbornD. M.WinerW. O.Fluid rheological effects in sliding elastohydrodynamic point contacts with transient loading: 1-film thicknessTrans. ASME J. Lubr. Technol., 1971, 93, 262–271.
29.
KanetaM.NishikawaH.KameishiK.SakaiT.OhnoN.Effects of elastic moduli of contact surfaces in elastohydrodynamic lubricationTrans. ASME J. Tribol., 1992, 114, 75–80.
30.
SadeghiF.SuiP. C.Thermal elastohydrodynamic lubrication of rolling/sliding contactsTrans. ASME J. Tribol., 1990, 112, 189–195.
31.
YagiK.KyogokuK.NakaharaT.Temperature measurements of both sliding surfaces and estimation of temperature profile across film thickness under EHL conditions (in Japanese)J. Jpn. Soc. Tribol., 2002, 47 (4), 321–328.
32.
CameronA.Hydrodynamic lubrication of rotating disks in pure sliding. A new type of oil film formationJ. Instn Petrol., 1951, 37, 471–486.
YagiK.KyogokuK.NakaharaT.Relationship between temperature distribution in EHL film and dimple formationTrans. ASME J. Tribol., 2005, 127, 658–665.
35.
WedevenL. D.Optical measurements in elastohydrodynamic rolling-contact bearings. PhD Thesis, University of London, 1970.
36.
JaegerJ. C.Moving sources of heat and the temperature at sliding contactsJ. Proc. R. Soc. New South Wales, 1942, 76, 203–224.
37.
RoelandsC. J. A.VulgterJ. C.WatermannH. I.The viscosity temperature pressure relationship of lubricating oils and its correlation with chemical constitutionTrans. ASME J. Basic Eng., 1963, 85, 601–610.
