This paper reports the first measurements of the effective tensile strength (or ‘cavitation threshold’) Fc, of degassed samples of a commercial multigrade engine oil over a range of temperatures, T, which are representative of those encountered under normal automotive engine operating conditions (in the range 20° C ≤ T ≤ 140°C). Also reported are the values of Fc obtained for Newtonian silicone oils over a range of shear viscosities. In the experiments reported herein, samples of liquid are subjected to dynamic stressing by a rapid pressure—tension cycle, this being a feature of the conditions experienced by an engine oil within a dynamically loaded journal bearing. The method used herein to estimate Fc avoids reliance upon direct measurements of substantial dynamic negative pressures using transducers which are designed for use in the range of positive pressures.
BerkerA.BouldinM. G.KleisS. J.Van ArnsdaleW. E.Effect of polymer on flow in journal bearingsJ. Non-Newtonian Fluid Mechanics, 1995, 56, 333–347.
7.
BraunM. J.HendricksR. C.An experimental investigation of the vaporous/gaseous cavity characteristics of an eccentric journal bearingTrans. ASLE, 1984, 27, 1–14.
BreweD. E.Theoretical modeling of the vapor cavitation in dynamically loaded journal bearingsTrans. ASME, J. Tribology, 1986, 108, 628–638.
10.
JosephD. D.Cavitation and the state of stress in a flowing liquidJ. Fluid Mechanics, 1998, 366, 367–378.
11.
FlobergL.Lubrication of two rotating cylinders at variable lubricant supply with special reference to the tensile strength of the liquid lubricant. In ASME-ASLE Conference, New York, Paper 72-Lab. 2.
12.
SedgewickS. A.TrevenaD. H.Limiting negative pressure of water under dynamic stressingJ. Phys. D: Appl. Phys., 1976, 9, 1983–1990.
13.
WilliamsP. R.WilliamsR. L.On anomalously low values of the tensile strength of waterProc. R. Soc.: Math. and Phys. Sci. A, 2000, 456, 1321–1332.
14.
GuptaR. K.ChanR. C.DeysarkarA. K.Flow of multigrade motor oils in an extensional flow fieldJ. Rheol., 1990, 34, 1373–1386.
15.
TomitaY.ShimaA.Mechanisms of impulsive pressure generation and damage pit formation by bubble collapseJ. Fluid Mechanics, 1986, 169, 535–564.
16.
WilliamsP. R.WilliamsP. M.BrownS. W. J.Pressure waves arising from the oscillation of cavitation bubbles under dynamic stressingJ. Phys. D: Appl. Phys., 1997, 30, 1197–1206.
TrevenaD. H.Cavitation and Tension in Liquids, 1987 (Adam Hilger, Bristol).
24.
WilliamsP. R.WilliamsP. M.BrownS. W. J.TemperleyH. N. V.On the tensile strength of water under pulsed dynamic stressingProc. R. Soc: Math. Phys. Sci. A, 1999, 455, 3311–3323.
25.
WilliamsP. R.WilliamsP. M.BrownS. W. J.Tensile properties of liquid mercury under pulsed dynamic stressingJ. Phys. D: Appl. Phys., 1998, 31, 1923–1926.
26.
MarstonP. L.UngerB. T.Rapid cavitation induced by the reflection of shock waves In Shock Waves in Condensed Matter, 1986, pp. 401–405 (Plenum, New York).
27.
BullT. H.The tensile strengths of liquids under dynamic loadingPhil. Mag., 1956, 8, 153–165.
28.
BesovA.KedrinskiiV.De VriesJ.KloostermanM.Cavitation thresholds, free surface and cavity cluster dynamics in liquids at shock wave reflection. In Liquids Under Negative Pressure (Eds ImreA. R.WilliamsH. J. Maris and P. R.), NATO Science Series II—Mathematics, Physics and Chemistry, 2002, Vol. 84, pp. 255–270 (Kluwer Academic, Dordrecht, The Netherlands).
29.
LiX. K.GwynllywD. Rh.DaviesA. R.PhillipsT. N.On the influence of lubricant properties on the dynamics of two-dimensional journal bearingsJ. Non-Newtonian Fluid Mechanics, 2000, 93, 29–59.
30.
BrindleyJ.ElliottL.McKayJ. T.The role of cavitation in whirl instability in a rotor bearingTrans. ASME, J. Appl. Mechanics, 1983, 50, 877–890.
31.
BindingD. M.CouchM. A.WaltersK.The rheology of multigrade oils at elevated pressuresJ. Non-Newtonian Fluid Mechanics, 1999, 87, 155–164.
32.
PearsonG.MiddlemanS.Elongational flow behaviour of viscoelastic liquids: Part 1. Modelling of bubble collapseAm. Inst. Chem. Engrs J., 1977, 23, 714–721.
