5 Conclusions
In this paper, an approach is presented to study the effect of starvation in elastohydrodynamic lubrication (EHL) of rough surfaces in both line contact and point contact. By relating the starvation to the reduction of the lubricant mass flow rate, the changes in the pressure distribution (both hydrodynamic and asperity) as well as the film thickness are investigated. It is shown that, in general, the effect of starvation on the central film thickness is more pronounced compared to the minimum film thickness. Also, the reduction of the central film thickness in point contact is greater than that of line contact, especially at smaller ellipticity values. It is also observed that in line contact, the reduction in the film thickness is only a function of the starvation degree, while in point contact, it is a function of the starvation degree as well as the ellipticity.
Regression analyses are performed for the simulation results within a wide range of input to develop expressions for the ratio of the reduction in central and minimum film thickness. These ratios are found to be functions of the starvation degree in line contact while they are functions of the starvation degree and ellipticity in point contact. These ratios can be applied to the film thickness formulas presented in Refs. [12] and [13] to extend their availability to the starved regimes. Also presented are the expressions for the asperity load ratio as functions of the starvation degree as well as other input parameters.
5 ConclusionsIn this paper, an approach is presented to study the effect of starvation in elastohydrodynamic lubrication (EHL) of rough surfaces in both line contact and point contact. By relating the starvation to the reduction of the lubricant mass flow rate, the changes in the pressure distribution (both hydrodynamic and asperity) as well as the film thickness are investigated. It is shown that, in general, the effect of starvation on the central film thickness is more pronounced compared to the minimum film thickness. Also, the reduction of the central film thickness in point contact is greater than that of line contact, especially at smaller ellipticity values. It is also observed that in line contact, the reduction in the film thickness is only a function of the starvation degree, while in point contact, it is a function of the starvation degree as well as the ellipticity.Regression analyses are performed for the simulation results within a wide range of input to develop expressions for the ratio of the reduction in central and minimum film thickness. These ratios are found to be functions of the starvation degree in line contact while they are functions of the starvation degree and ellipticity in point contact. These ratios can be applied to the film thickness formulas presented in Refs. [12] and [13] to extend their availability to the starved regimes. Also presented are the expressions for the asperity load ratio as functions of the starvation degree as well as other input parameters.
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