Transient EHL of Two Surfaces under Elliptical Contact with Non-Newtonian Lubricant


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This paper presents the effects of a sudden load change and sudden speed change on the performance characteristics of two surfaces under elliptical contact with elastohydrodynamic lubrication. The non-Newtonian lubricant for the research work are modeled based on Carreau viscosity model. The time dependent modified Reynolds equation and elastic equation were formulated for compressible fluid. Perturbation method, Newton Raphson method and full adaptive multigrid method were implemented and solved to obtain the film pressure, film thickness profiles and friction coefficient in the contact regime at various applied loads and speeds. Simulation results show the friction coefficient increase significantly under sudden loads. The minimum film thickness and friction coefficient both decrease significantly as speed is decreased.



Advanced Materials Research (Volumes 452-453)

Edited by:

Liu Pei




M. Mongkol and P. Jesda, "Transient EHL of Two Surfaces under Elliptical Contact with Non-Newtonian Lubricant", Advanced Materials Research, Vols. 452-453, pp. 1291-1295, 2012

Online since:

January 2012




[1] D. Dowson, G.R. Higginson : Elastohydrodynamic Lubrication : The Fundamental of Roller and Gear Lubrication , Pergamon, Oxford, (1966).

[2] C.C. Kweh, H.P. Evans and R.W. Snidle : Microelastohydrodyna-mic lubrication of an elliptical contact with transverse and three-dimensional roughness, Trans. ASME, J. Tribology Vol. 111(1989), pp.577-583.


[3] R.T. Lee and B.J. Hamrock : A circular non-Newtonian fluid model: Part II - used in micro-elastohydrodynamic lubrication, Trans. ASME, J. Tribology Vol. 112(1990), pp.497-505.


[4] D.J. Vahid, H. Rahnejat, Z.M. Jin and D. Dowson : Transient analysis of isothermal elastohydrodynamic circular point contacts, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science Vol. 215(2001).


[5] Z.M. Jin, P. Yang, J. Cui and D. Dowson : Transient elastohydrodynamic analysis of ellipti-cal contacts. Part 1: isothermal and Newtonian lubricant solution, Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology Vol. 218(2004).


[6] A.A. Lubrecht, W.E. Ten Napel and R. Bosma : Multi-grid, an Alternative Method for Calculating Film Thickness and Pressure Profiles in EHL Line Contacts, ASME, J. Tribology Vol. 108(1986), p.551–556.


[7] F.K. Osborn, and F. Sadeghi : Time Dependent Line EHD Lubrication Using the Multigrid/Multilevel Technique, ASME, J. Tribology Vol. 114(1992), p.68–74.


[8] R.I. Tanner : Engineering Rheology, Clarendon Press, Oxford, , Vol. 14–15 (1985), p.359.

[9] C.J.A. Roelands : Correlational Aspects of the Viscosity-Temperature-Pressure Relationship of Lubricating Oils, Druk, V.R.B., Groingen, Netherland, (1969).

[10] S. Bair and F. Qureshi : The high pressure rheology of polymer-oil solutions, Tribology International Vol. 36(2003), pp.637-645.


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