Publications
Many Tribology Group publications are Open Access thanks to funding from the EPSRC.
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Journal articleGuangteng G, Spikes HA, 1997,
An experimental study of film thickness in the mixed lubrication regime
, Tribology Series, Vol: 32, Pages: 159-166, ISSN: 0167-8922This paper describes an experimental study of the influence of surface roughness on elastohydrodynamic film thickness in a steel ball on glass flat contact under nominally pure rolling conditions. Steel balls with a range of isotropic roughnesses have been employed and measurements have focused on the mixed lubrication regime where the film thickness is comparable to or below the composite surface roughness. It has been found that full film lubrication is only realised when the nominal lambda ratio (X) has a value of 2 or higher. Below this value, the film thickness decreases, first gradually and then rapidly, as the nominal smooth surface lambda ratio decreases. The mixed regime, where both roughness and entrainment velocity influence film separation, appears to span a large range in terms of the lambda ratio, from λ = 2 to λ = 0.1. The mean separation between rough surfaces in static contacts has been measured over a range of loads and the problem of the precise definition of lubricant film thickness in rough surface conditions is discussed. © 1997 Elsevier Science B.V. All rights reserved.
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Conference paperSpikes H, 1997,
Advances in the study of thin lubricant films
, 1st World Tribology Congress - New Directions in Tribology, Publisher: MECHANICAL ENGINEERING PUBLISHING LTD, Pages: 355-369- Author Web Link
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- Citations: 7
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Journal articleCann PME, 1997,
Film distribution in grease lubricated rolling contact
, NLGI Spokesman (National Lubricating Grease Institute), Vol: 61, Pages: 22-29, ISSN: 0027-6782 -
Book chapterAnghel V, Cann PME, Spikes HA, 1997,
Direct measurement of boundary lubricating films
, Elastohydrodynamics '96 Proceedings of the Leeds-Lyons Symposium on Elastohydrodynamics '96 Leeds September 1996, Editors: Dowson, Amsterdam, Publisher: Elsevier, Pages: 459-466, ISBN: 9780444416773 -
Journal articleRatoi Salagean M, Spikes HA, 1997,
Design of lubricious oil-in-water emulsions
, Proceedings of the Institution of Mechanical Engineers Part J-Journal of Engineering Tribology, Vol: 211, Pages: 195-208, ISSN: 1350-6501 -
Book chapterRatoi Salagean M, Spikes HA, 1997,
The lubricant film-forming properties of a modern fire-resistant hydraulic fluids
, Tribology of Hydraulic Pump Testing ASTM STP 1310, Editors: Totten, Kling, Smolenski, Philadelphia, Publisher: American Society for Testing and Materials, Pages: 21-37, ISBN: 9780803124226 -
Book chapterSpikes HA, 1997,
Advances in the study of thin lubricant films
, New directions in tribology, Editors: Hutchins, Publisher: M.E.P., Pages: 353-369, ISBN: 9781860580994 -
Conference paperHirst DJ, Olver AV, 1997,
Failure of very high speed elastohydrodynamic contacts
, Proceedings of the 23rd Leeds-Lyon Symposium on Tribology "Elasthydrodynamics", Publisher: Elsevier, ISSN: 0167-8922 -
Conference paperKim TH, Olver AV, 1997,
Fatigue and brittle fracture analysis of surface engineered materials in rolling contact
, Proceedings of the 23rd Leeds-Lyon Symposium on Tribology "Elastohydrodynamics", Publisher: Elsevier, Pages: 37-48, ISSN: 0167-8922 -
Conference paperSpikes HA, Wei DP, 1997,
Fuel lubricity - fundamentals and review
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Conference paperMitsui H, Spikes HA, Suita Y, 1997,
Boundary film formation by low molecular weight polymers
, Amsterdam, Publisher: Elsevier, Pages: 487-500 -
Journal articleSmeeth M, Spikes HA, 1997,
Central and minimum elastohydrodynamic film thickness at high contact pressure
, Transactions of the ASME Journal of Tribology, Vol: 119, Pages: 291-296, ISSN: 0742-4787 -
Conference paperCann PME, Chevalier F, Lubrecht AA, 1997,
Track depletion and replenishment in a grease lubricated point contract: A quantitative analysis
, 23rd Leeds-Lyon Symposium on Tribology:Elstohydrodynamics - '96: Fundamentals and applications in lubrication and traction, Pages: 405-414, ISSN: 0167-8922 -
Book chapterSugimura J, Spikes HA, 1997,
Technique for measuring EHD film thickness in non-steady state contact conditions
, Elastohydrodynamics - '96 Fundamentals and Applications in Lubrication and Traction Proceedings of the Leeds-Lyon Symposium September 1996 University of Leeds, Editors: Dowson, Amsterdam, Publisher: Elsevier, Pages: 91-100, ISBN: 9780444828095 -
Journal articleBaker RF, Olver AV, 1997,
Direct observations of the fretting wear of steel
, Wear, Vol: 204, Pages: 425-433, ISSN: 0043-1648 -
Book chapterAnghel V, Cann PME, Spikes HA, 1997,
Direct measurement of boundary lubricating films
, Elastohydrodynamics '96 Proceedings of the Leeds-Lyons Symposium on Elastohydrodynamics '96 Leeds September 1996, Editors: Dowson, Amsterdam, Publisher: Elsevier, Pages: 459-466, ISBN: 9780444416773 -
Journal articleSpikes HA, 1997,
Mixed lubrication: an overview
, Lubrication Science, Vol: 9, Pages: 221-253, ISSN: 0954-0075 -
Journal articleRatoi Salagean M, Spikes HA, Rieffe HL, 1997,
Optimizing film formation by oil-in-water emulsions
, Tribology Transactions, Vol: 40, Pages: 569-578, ISSN: 0569-8197 -
Journal articleGuangteng G, Spikes HA, 1997,
The control of friction by molecular fractionation of base fluid mixtures at metal surfaces
, Tribology Transactions, Vol: 40, Pages: 461-469, ISSN: 0569-8197 -
Book chapterSayles RS, Lee-Prudhoe I, Bouvet C, 1997,
Some aspects of the contact mechanics and lubrication of low modulus materials in rough interfaces
, Elastohydrodynamics '96, Editors: Dowson, Publisher: Elsevier, Pages: 209-217, ISBN: 9780444828095 -
Book chapterGuangteng G, Spikes HA, 1997,
Experimental study of film thickness in the mixed lubrication regime
, Proceedings of the Leeds-Lyons symposium on elastohydrodynamics '96 Leeds September 1996, Editors: Dowson, Amsterdam, Publisher: Elsevier, Pages: 159-166, ISBN: 9780444828095 -
Book chapterRutlin HC, Sayles RS, Starkey MS, 1997,
An optical ehd study using a reciprocating Hertzian contact rig designed to simulate the kinematics of constant velocity joints
, Elastohydrodynamics '96, Editors: Dowson, Publisher: Elsevier, Pages: 297-303, ISBN: 9780444828095 -
Journal articleCann PME, 1996,
Understanding grease lubrication
, Tribology Series, Vol: 31, Pages: 573-581, ISSN: 0167-8922Grease lubrication remains a scientifically neglected area of tribology as, in contrast, to fluid film lubrication there has been little progress hi our understanding hi recent years. At present we know little of the mechanisms of film formation, and loss, and the nature of the separating film formed. There is no satisfactory model for greases and thus it is impossible to predict performance, or service life, from simple bulk Theological properties. The aim of this paper is to clarify the mechanisms of film formation by greases in rolling elastohydrodynamic (EHD) contacts. Thus existing lubrication models are reviewed and compared to experimental findings and, hi the light of this, more recent work being carried out hi the Tribology Section is reported. These studies have concentrated on fundamental aspects of grease behaviour in a model bearing contact and have sought to explain the lubrication mechanisms and nature of the film formed. The different film formation mechanisms observed in this work are discussed. Evidence of both hydrodynamic and boundary layer formation is presented and the implications of the different mechanisms of load carrying considered. © 1996 Eisevier Science E.V. All rights reserved.
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Journal articleOlver AV, Cann PM, Loric JC, 1996,
An investigation into the properties of a thin solid coating using an optical method
, Tribology Series, Vol: 31, Pages: 471-478, ISSN: 0167-8922The elastic modulus of a thin (3 μm) solid coating has been determined by pressing a coated wire against a diamond flat and measuring the contact width optically. The technique neither involves the use of ultra-low loads, nor of costly equipment, and provides results which are accurate enough to be useful in contact stress analysis. © 1996 Elsevier Science E.V. All rights reserved.
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Journal articleSayles RS, 1996,
Basic principles of rough surface contact analysis using numerical methods
, Tribology International, Vol: 29, Pages: 639-650, ISSN: 0301-679X -
Journal articleCann PME, Hutchinson J, Spikes HA, 1996,
Development of a space layer imaging method (SLIM) for mapping elastohydrodynamic contacts
, Tribology Transactions, Vol: 39, Pages: 915-921, ISSN: 0569-8197 -
Journal articleSmeeth M, Spikes HA, Gunsel S, 1996,
The formation of viscous surface films by polymer solutions: Boundary or elastohydrodynamic lubrication?
, Tribology Transactions, Vol: 39, Pages: 720-725, ISSN: 0569-8197 -
Conference paperSmeeth M, Gunsel S, Spikes HA, 1996,
Friction and wear reduction by boundary film-forming viscosity index improvers
, SAE Technical Paper 962037, Publisher: Society of Automotive Engineers, ISSN: 0148-7191 -
Journal articleGuangteng G, Spikes HA, 1996,
Boundary film formation by lubricant base fluids
, Tribology Transactions, Vol: 39, Pages: 448-454, ISSN: 0569-8197 -
Conference paperRatoiSalagean M, Spikes H, Rieffe H, 1996,
Optimizing film formation by oil-in-water emulsion
, Society-of-Tribologists-and-Lubrication-Engineers 51st Annual Meeting, Publisher: SOC TRIBOLOGISTS & LUBRICATION ENGINEERS, Pages: 213-226 -
Journal articleCaporiccio G, Cann PME, Spikes HA, 1996,
Additives for fluorosilicone oils at high temperature
, Wear, Vol: 193, Pages: 261-268, ISSN: 0043-1648 -
Journal articleGuangteng G, Spikes HA, 1996,
The role of surface tension and disjoining pressure in starved and parched lubrication
, Proceedings of the Institution of Mechanical Engineers Part J-Journal of Engineering Tribology, Vol: 210, Pages: 113-124, ISSN: 1350-6501 -
Conference paperSpikes HA, Cann PME, 1996,
The thickness and rheology of boundary lubricating layers
, Proceedings of the International Tribology Conference Yokohama October 1995, Publisher: JST, Pages: 1089-1094 -
Journal articleZhu YY, Kelsall G, Spikes HA, 1996,
Triboelectrochemistry on a nanometre scale
, Tribology Letters, Vol: 2, Pages: 287-312, ISSN: 1023-8883 -
Conference paperTripaldi G, Vettor A, Spikes HA, 1996,
Friction behaviour of ZDDP films in the mixed boundary/EHD regime
, SAE Technical Paper 962036, Publisher: Society of Automotive Engineers, ISSN: 0148-7191 -
Journal articleGuangteng G, Smeeth M, Cann PME, et al., 1996,
Measurement and modelling of the boundary film properties of polymeric lubricant additives
, Proceedings of the Institution of Mechanical Engineers Part J-Journal of Engineering Tribology, Vol: 210, Pages: 1-15, ISSN: 1350-6501 -
Journal articleSmeeth M, Gunsel S, Spikes HA, 1996,
Boundary film formation by viscosity index improvers
, Tribology Transactions, Vol: 39, Pages: 726-734, ISSN: 0569-8197 -
Book chapterPalios S, Cann PME, Spikes HA, 1996,
Behaviour of PTFE suspensions in rolling/sliding contacts
, The Third Body Concepts: Interpretation of Tribological Phenomena Proceedings of the 22nd Leeds/Lyon Symposium on Tribology, Lyon France September 5th-8th 1995, Publisher: Elsevier, ISBN: 9780444825025 -
Journal articleSpikes HA, 1996,
Direct observation of boundary layers
, Langmuir, Vol: 12, Pages: 4567-4573, ISSN: 0743-7463 -
Conference paperSayles RS, 1996,
Rough and dirty machine element contacts: some tribological aspects and engineering implications
, Proceedings of the international tribology conference Yokohama 1995, Publisher: Japanese Society of Tribologists, Pages: 43-48 -
Journal articleSmeeth M, Spikes HA, Gunsel S, 1996,
Performance of viscosity index improvers in lubricated contacts
, Langmuir, Vol: 12, Pages: 4594-4598, ISSN: 0743-7463 -
Conference paperBovington C, Anghel V, Spikes HA, 1996,
Predicting sequence VI and VIA fuel economy from laboratory bench tests
, SAE Paper 961142, Publisher: Society of Automotive Engineers -
Journal articleCann PME, 1996,
Starvation and reflow in grease-lubricated elastohydrodynamic contact
, Tribology Transactions, Vol: 39, Pages: 698-704, ISSN: 0569-8197 -
Journal articleWei DP, Korcek S, Spikes HA, 1996,
Comparison of the lubricity of gasoline and diesel fuels
, SAE Transactions, Vol: 105, Pages: 1650-1658, ISSN: 0096-736X -
Journal articleGuangteng G, Smeeth M, Cann PME, et al., 1996,
Measurement and modelling of the boundary film properties of polymeric lubricant additives
, Proceedings of the Institution of Mechanical Engineers Part J-Journal of Engineering Tribology, Vol: 210, Pages: 1-15, ISSN: 1350-6501 -
Conference paperBovington C, Spikes HA, 1996,
Prediction of the influence of lubricant formulation on fuel economy, from laboratory bench tests
, Proceedings of the International Tribology Conference Yokohama, October 1995, Publisher: JST, Pages: 817-822 -
Conference paperSpikes HA, Cann PME, 1996,
The thickness and rheology of boundary lubricating layers
, Proceedings of the International Tribology Conference Yokohama October 1995, Publisher: JST, Pages: 1089-1094 -
Journal articleCaporiccio G, Cann PME, Spikes HA, 1996,
Additives for fluorosilicone oils at high temperature
, Wear, Vol: 193, Pages: 261-268, ISSN: 0043-1648 -
Conference paperSmeeth M, Spikes HA, 1996,
The influence of slide/roll ratio on the film thickness in EHD contact operating in the mixed lubrication regime
, The Third Body Concept: Interpretation of Tribological Phenomena Proceedings of the 22nd Leeds-Lyon Symposium on Tribology, Lyon France September 5th-8th 1995, Publisher: Elsevier, Pages: 695-703 -
Conference paperCann PME, Hamer JC, Sayles RS, et al., 1996,
Direct observation of particle entry and deformation in rolling EHD contact
, The third body concept: interpretation of tribological phenomena, proceedings of the 22nd Leeds-Lyon symposium on tribology, Lyon, France September 5-8th, 1995, Publisher: Elsevier, Pages: 127-134
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