A generalized traction curve for EHL contacts

In this paper the subject of friction prediction is revisited, with the aim of obtaining a general formula predicting the coefficient of friction over a wide range of operating conditions. By means of full numerical simulations of the smooth isothermal elliptic contact, and assuming an Eyring non-Newtonian behavior, the coefficient of friction is computed for a wide range of operating conditions. It is shown that with respect to sliding friction, all results can be presented on a single generalized friction curve relating a reduced coefficient of friction to a characteristic nondimensional shear stress. Finally, it is shown that some measured data presented in the literature when presented in terms of the derived parameters closely follow the derived behavior, which provides a validation of the theoretical results.

[1]  Hugh Spikes,et al.  Prediction of traction in elastohydrodynamic lubrication , 1998 .

[2]  Farshid Sadeghi,et al.  Non-newtonian thermal elastohydrodynamic lubrication , 1991 .

[3]  Rong-Tsong Lee,et al.  A Circular Non-Newtonian Fluid Model: Part I—Used in Elastohydrodynamic Lubrication , 1990 .

[4]  K. Johnson,et al.  The Rheological Properties of Elastohydrodynamic Lubricants , 1986 .

[5]  D. Dowson,et al.  Isothermal Elastohydrodynamic Lubrication of Point Contacts: Part III—Fully Flooded Results , 1976 .

[6]  T. F. Conry,et al.  A Reynolds-Eyring Equation for Elastohydrodynamic Lubrication in Line Contacts , 1987 .

[7]  D. Dowson,et al.  Elasto-hydrodynamic lubrication : the fundamentals of roller and gear lubrication , 1966 .

[8]  K L Johnson,et al.  Regimes of Traction in Elastohydrodynamic Lubrication , 1986 .

[9]  Bernard J. Hamrock,et al.  Non-Newtonian and Thermal Effects on Film Generation and Traction Reduction in EHL Line Contact Conjunctions , 1994 .

[10]  A. A. Lubrecht,et al.  Elastohydrodynamic lubrication of rough surfaces , 1999 .

[11]  H. P. Evans,et al.  Solution of the Non-Newtonian Elastohydrodynamic Problem for Circular Contacts Based on a Flow Continuity Method , 1996 .

[12]  B. Hamrock,et al.  A new non-newtonian fluid model for elastohydrodynamic lubrication of rectangular contacts , 1991 .

[13]  S. Bair,et al.  A Rheological Model for Elastohydrodynamic Contacts Based on Primary Laboratory Data , 1979 .

[14]  W. 0. Winer,et al.  Correlational Aspects of the Viscosity-Temperature-Pressure Relationship of Lubricating Oils(Dr In dissertation at Technical University of Delft, 1966) , 1966 .

[15]  Duncan Dowson,et al.  On lubricant transport conditions in elastohydrodynamic conjuctions , 1998, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[16]  M. Kaneta,et al.  Experimental study on microelastohydrodynamic lubrication , 1999 .

[17]  Bo Jacobson,et al.  Non-Newtonian Fluid Model Incorporated Into Elastohydrodynamic Lubrication of Rectangular Contacts , 1983 .

[18]  H. A. Spikes,et al.  Thin films in elastohydrodynamic lubrication: The contribution of experiment , 1999 .

[19]  H. Moes,et al.  Optimum similarity analysis with applications to elastohydrodynamic lubrication , 1992 .

[20]  J. A. Greenwood,et al.  Two-dimensional flow of a non-Newtonian lubricant , 2000 .

[21]  C. Venner.  Multilevel solution of the EHL line and point contact problems , 1991 .

[22]  Farshid Sadeghi,et al.  Non-Newtonian Elastohydrodynamic Lubrication of Point Contact , 1991 .

[23]  A. Lubrecht,et al.  Amplitude reduction of non-isotropic harmonic patterns in circular EHL contacts, under pure rolling , 1999 .

[24]  J. L. Tevaarwerk,et al.  Shear behaviour of elastohydrodynamic oil films , 1977, Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences.

[25]  A. A. Lubrecht,et al.  The numerical solution of the elastohydrodynamically lubricated line- and point contact problem, using multigrid techniques , 1987 .