Abstract: Results of full numerical solutions of three dimensional EHL in nominal point contacts are presented. On the basis of theoretical and experimental studies on rheological models in EHL contacts, a new rheological model of fourth power is proposed to study shear stress. Effects of temperature and non-newtonian behavior of fluids on lubrication state are investigated. Distributions of three dimensional shear stresses are studied. The shear stress reveals the mechanism of traction. Since subsurface stress is important to fatigue failure, three dimensional Mises stress diagram in the subsurfaces are calculated. Relationship between surface fatigue and subsurface stress field is discussed.

Key words: EHL, Non-Newtonian, Stress distribution, Thermal effect