The results of thermal elasthydrodynamic lubrication (EHL) analysis of elliptical contacts between a rough stationary surface and a smooth moving surface are described. The lubricant entrainment is along the major or minor axis of the Hertzian contact ellipse. The equivalent radius in the entrainment direction is assumed to be the same for every elliptical contact. The ridges and the furrows of the sinusoidal roughness are aligned with the arbitrary direction to that of lubricant entrainment. Non-Newtonian fluid flow model (Eyring model) is employed. Obtained results suggest that the rolling contact fatigue is unlikely to occur on the surfaces with longitudinal roughness, and wear or scuffing is likely to occur in elliptical EHL contacts with entrainment along the major contact axis than along the minor contact axis and the origin is at the region where the roughness having orientation angles between 60° and 90° overlaps with macroscopic horseshoe shaped constriction.
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