Transient film thickness behavior is investigated using full elastohydrodynamic lubrication (EHL) line contact simulations during film collapse due to sudden halt and impact loading. Due attention is given to realistic shear-thinning behavior and comparisons are made with a largely ignored class of EHL lubricants that exhibit linear pressure–viscosity dependence at low pressures. The EHL film collapse is found to be governed by the piezoviscous response and the linear P–V oils exhibit rapidly collapsing EHL entrapment. Under impact loading, the transient film thickness deviates markedly from the corresponding steady-state behavior and this departure is a function of lubricant rheology.
Issue Section:
Elastohydrodynamic Lubrication
Keywords:
Bearings,
Elastohydrodynamic lubrication,
Gears,
lubricants,
Rheology,
Rolling,
Squeeze films,
Viscosity
References
1.
Dowson
, D.
, and Jones
, D. A.
, 1967
, “Lubricant Entrapment Between Approaching Elastic Solids
,” Nature
, 214
(5091), pp. 947
–948
.10.1038/214947b02.
Christensen
, H.
, 1970
, “Elastohydrodynamic Theory of Spherical Bodies in Normal Approach
,” ASME J. Lubr. Technol.
, 92
(1
), pp. 145
–154
.10.1115/1.34513053.
Lee
, K. M.
, and Cheng
, H. S.
, 1973
, “The Pressure and Deformation Profiles Between Two Normally Approaching Lubricated Cylinders
,” ASME J. Lubr. Technol.
, 95
(3
), pp. 308
–317
.10.1115/1.34518134.
Safa
, M. M. A.
, and Gohar
, R.
, 1986
, “Pressure Distribution Under a Ball Impacting a Thin Lubricant Layer
,” ASME J. Tribol.
, 108
(3
), pp. 372
–376
.10.1115/1.32612075.
Lee
, R. T.
, and Hamrock
, B. J.
, 1989
, “Squeeze and Entraining Motion in Nonconformal Line Contacts. Part II-Elastohydrodynamic Lubrication
,” ASME J. Tribol.
, 111
(3
), pp. 8
–16
.10.1115/1.32618846.
Yang
, P.
, and Wen
, S.
, 1991
, “Pure Squeeze Action in an Isothermal Elastohydrodynamically Lubricated Spherical Conjunction
,” Wear
, 142
(1
), pp. 1
–30
.10.1016/0043-1648(91)90148-N7.
Dowson
, D.
, and Wang
, D.
, 1995
, “Impact Elastohydrodynamics
,” Proceedings of the 21st Leeds-Lyon Symposium on Tribology
, D.
Dowson
, C. M.
Taylor
, T.
, Childs
, and G.
Dalmaz
, eds., Elsevier
, Amsterdam
, pp. 565
–582
.10.1016/S0167-8922(08)70661-88.
Chang
, L.
, 1996
, “An Efficient Calculation of the Load and Coefficient of Restitution of Impact Between Two Elastic Bodies With a Liquid Lubricant
,” ASME J. Appl. Mech.
, 63
(2
), pp. 347
–352
.10.1115/1.27888719.
Glovnea
, R. P.
, and Spikes
, H. A.
, 2000
, “The Influence of Lubricant Upon EHD Film Behavior During Sudden Halting of Motion
,” STLE Tribol. Trans.
, 43
(4
), pp. 731
–739
.10.1080/1040200000898240210.
Kumar
, P.
, Jain
, S. C.
, and Ray
, S.
, 2002
, “Thermal EHL of Rough Rolling/Sliding Line Contacts Using a Mixture of Two Fluids at Dynamic Loads
,” ASME J. Tribol.
, 124
(4
), pp. 709
–715
.10.1115/1.146708711.
Zhoa
, J.
, and Sadeghi
, F.
, 2003
, “Analysis of EHL Circular Contact Shut Down
,” ASME J. Tribol.
, 125
(1
), pp. 76
–89
.10.1115/1.148136612.
Sakamoto
, M.
, Nishikawa
, H.
, and Kaneta
, M.
, 2004
, “Behaviour of Point Contact EHL Films Under Pulsating Loads
,” Proceedings of the 30th Leeds Lyon Symposium on Tribology
, A.
Lubrecht
, and G.
Dalmaz
, eds., Elsevier
, Amsterdam
, pp. 391
–399
.13.
Guo
, F.
, Nishikawa
, H.
, Yang
, P.
, and Kaneta
, M.
, 2007
, “EHL Under Cyclic Squeeze Motion
,” Tribol. Int.
, 40
(1
), pp. 1
–9
.10.1016/j.triboint.2005.10.00614.
Kaneta
, M.
, Ozaki
, S.
, Nishikawa
, H.
, and Guo
, F.
, 2007
, “Effects of Impact Loads on Point Contact Elastohydrodynamic Lubrication Films
,” Proc. Inst. Mech. Eng. Part-J
, 221
(3
), pp. 271
–278
.10.1243/13506501JET23615.
Nishikawa
, H.
, Miyazaki
, H.
, Kaneta
, M.
, and Guo
, F.
, 2008
, “Effects of Two-Stage Impact Load on Point Contact Elastohydrodynamic Lubrication Films
,” Proc. Inst. Mech. Eng. Part-J
, 222
(7
), pp. 807
–814
.10.1243/13506501JET38916.
Kumar
, P.
, Khonsari
, M. M.
, and Bair
, S.
, 2010
, “Anharmonic Variations in EHL Film Thickness Resulting From Harmonically Varying Entrainment Velocity
,” Proc. Inst. Mech. Eng. Part-J
, 224
(3
), pp. 239
–247
.10.1243/13506501JET66917.
Anuradha
, P.
, and Kumar
, P.
, 2012
, “Effect of Lubricant Selection on EHL Performance of Involute Spur Gears
,” Tribol. Int.
, 50
(1), pp. 82
–90
.10.1016/j.triboint.2012.02.00618.
Martini
, A.
, and Bair
, S.
, 2010
, “The Role of Fragility in EHL Entrapment
,” Tribol. Int.
, 43
(1–2
), pp. 277
–282
.10.1016/j.triboint.2009.06.00619.
Kumar
, P.
, and Khonsari
, M. M.
, 2009
, “On the Role of Lubricant Rheology and Piezo-Viscous Properties in Line and Point Contact EHL
,” Tribol. Int.
, 42
(11–12
), pp. 1522
–1530
.10.1016/j.triboint.2008.11.00620.
Bair
, S.
, and Qureshi
, F.
, 2003
, “The Generalized Newtonian Fluid Model and Elastohydrodynamic Film Thickness
,” ASME J. Tribol.
, 125
(1
), pp. 70
–75
.10.1115/1.150408621.
Bair
, S.
, 2007
, High Pressure Rheology for Quantitative Elastohydrodynamics (Tribology and Interface Engineering Series 54)
, Elsevier Press
, Amsterdam
.22.
Bair
, S.
, 2004
, “Actual Eyring Models for Thixotropy and Shear-Thinning: Experimental Validation and Application to EHD
,” ASME J. Tribol.
, 126
(4
), pp. 728
–732
.10.1115/1.179269323.
Chapkov
, A. D.
, Bair
, S.
, Cann
, P.
, and Lubrecht
, A. A.
, 2007
, “Film Thickness in Point Contacts Under Generalized Newtonian EHL Conditions: Numerical and Experimental Analysis
,” Tribol. Int.
, 40
(10–12
), pp. 1474
–1478
.10.1016/j.triboint.2007.01.00224.
Jang
, J. Y.
, Khonsari
, M. M.
, and Bair
, S.
, 2007
, “On the Elastohydrodynamic Analysis of Shear-Thinning Fluids
,” Proc. R. Soc. London
, 463
(2078), pp. 3271
–3290
.10.1098/rspa.2007.006225.
Liu
, Y.
, Wnag
, Q. J.
, Bair
, S.
, and Vergne
, P.
, 2007
, “A Quantitative Solution for the Full Shear-Thinning EHL Point Contact Problem Including Traction
,” Tribol. Lett.
, 28
(2
), pp. 171
–181
.10.1007/s11249-007-9262-526.
Krupka
, I.
, Kumar
, P.
, Bair
, S.
, Khonsari
, M. M.
, and Hartl
, M.
, 2010
, “The Effect of Load (Pressure) for Quantitative EHL Film Thickness
,” Tribol. Lett.
, 37
(3
), pp. 613
–622
.10.1007/s11249-009-9559-727.
Kumar
, P.
, Bair
, S.
, Krupka
, I.
, and Hartl
, M.
, 2010
, “Newtonian Quantitative Elastohydrodynamic Film Thickness With Linear Piezoviscosity
,” Tribol. Int.
, 43
(11
), pp. 2159
–2165
.10.1016/j.triboint.2010.06.00528.
Spikes
, H. A.
, 1987
, “Wear and Fatigue Problems in Connection With Water-Based Hydraulic Fluids
,” J Synth. Lubr.
, 4
(2
), pp. 115
–135
.10.1002/jsl.300004020329.
Anuradha
, P.
, and Kumar
, P.
, 2011
, “EHL Line Contact Central and Minimum Film Thickness Equations for Lubricants With Linear Piezoviscous Behavior
,” Tribol. Int.
, 44
(10
), pp. 1257
–1260
.10.1016/j.triboint.2011.05.00930.
Kumar
, P.
, and Khonsari
, M. M.
, 2008
, “Combined Effects of Shear Thinning and Viscous Heating on EHL Characteristics of Rolling/Sliding Line Contact
,” ASME J. Tribol.
, 130
(4
), p. 041505
.10.1115/1.295911131.
Ehret
, P.
, Dowson
, D.
, and Taylor
, C. M.
, 1998
, “On Lubricant Transport Conditions in Elastohydrodynamic Conjunctions
,” Proc. R. Soc. London A
, 454
(1980), pp. 763
–781
.10.1098/rspa.1998.0185Copyright © 2015 by ASME
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