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By D. Dowson, C. M. Taylor, T. H. C. Childs, Godet. M.

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Extra info for Thin Films in Tribology: Proceedings of the 19th Leeds-Lyon Symposium on Tribology Held at the Institute of Tribology, University of Leeds, U.K. 8th (Leeds-Lyon Symposium on Tribology Proceedings)

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Rough EHD contact, from [26] This result suggests that the EHD effect of the asperities can be examined separately from 23 the bulk contact, with a considerable saving in computational complexity. Thus Greenwood & Johnson [20] have made a simple linearised Newtonian analysis of a flat surface in contact with an infinite stationary surface of sinusoidal profile. At a mean pressure representative of EHL contacts the surface ripples were squashed flat; the small residual ripple was almost entirely due to lubricant compressibility.

L. M. A. Rigney, Friction, Wear and Microstructure of Unlubricated Austenitic Stainless Steels. E. Dieter, Mechanical Metallurgy, McGraw Hill, 1988, pp 212-219. 37 21. A. Dearnley,A. A. Hibberd and T. Bell, Proc. Conf. Plasma Surface Engineering, Garmisch-Partenkirchen, FRG, Sept. 1988,Vol. 1, pp. 219-226. 22. P. Hannada, P. P. Hirvonen, SurfaceStructure and Properties of Ion Nitrided Austenitic Stainless Steel, Thin Solid Films, 181,1989,pp. 343-350. 23. E. J. Coleman and KR. Pirt, British Corrosion Journal, 1977,12,p.

At greater values of S the second term in the square bracket of equation (11) becomes negligible whence From this we see that, in the non-Newtonian regime, the film shape is sensitive to the slide roll ratio, whereas in Newtonian conditions the film shape is independent of S. A comparable non-Newtonian Reynolds' equation based on the 'circular' constitutive equation (10) (neglecting viscoelastic effects) has been derived by Lee & Hamrock [ 171. Difficulties arise in developing a Reynolds' equation for two dimensional flow due to the von Mises quadratic interaction between the two components of shear stress zxz and zyz .

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