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THE EEECTS OF COUPLE STRESS AND SURFACE ROUGHNESS IN THE SQUEEZE FILM LUBRICATION OF SPHERICAL BEARINGS

Keywords: Couple stress fluids , Surface roughness , Load capacity and Squeezing time.

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Abstract:

In this paper, a theoretical study of combined effects of surface roughness and couple stresses on squeeze film lubrication of spherical bearings is analyzed. The modified Reynolds Equations accounting for the couple stresses and surface roughness using Deterministic Theory are mathematically derived. It is applied to study the effects of roughness and couple stresses in spherical bearings. In order to get the expression for pressure the modifiedReynolds equation is solved. Then by making use of this expression we obtain the expressions for load carrying capacity, which in turn is used to find the expression for response time. These expressions are numerically computed and the results are presented graphically. From the numerical computations of the results, it is found that, the effect of couple stresses is to increase the load carrying capacity. A parameter characteristics different type of roughness is identified. It is observed that in case of transverse roughness pattern the load capacity increases where as it decreases for longitudinal roughness pattern.

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