On the optimum dimple depth-over-diameter ratio for textured surfaces

Chenbo Ma,Jianjun Sun,Yan Wang,Qiaoan Tu,Qiuping Yu,Bo Yu

doi:10.1177/1687814017720085

Chenbo Ma, Jianjun Sun + Show 4 more

Open Access

https://doi.org/10.1177/1687814017720085

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Abstract

It is well accepted that the ratio of the dimple depth-over-diameter is a key geometric parameter in surface texturing design. In this article, the effect of this ratio on the average pressure is investigated by solving Reynolds equation numerically, where the Jakobsson–Floberg–Olsson cavitation theory is implemented using a mass-conservative algorithm. The results show that the optimum dimple depth-over-diameter ratio should be determined at the given depth or diameter larger than a critical value. Otherwise, the considerably smaller maximum value of average pressure will be obtained. Moreover, a dimple depth or diameter should be selected carefully in conjunction with the operating conditions to determine the optimum dimple depth-over-diameter ratio.

Highlights

Surface texturing has emerged as a viable technique to significantly enhance the load-carrying capacity, friction coefficient, and wear resistance of vital tribological components such as bearings, mechanical seals, piston rings, and the like
In order to obtain the change in the dimple DOD ratio, two methods are adopted in the numerical simulation
It should be noted that the cell sides L will change when changing the dimple diameter based on equation (1) and, for this reason, the average pressure rather than the load-carrying capacity is taken as the evaluation parameter

Summary

Introduction

Surface texturing has emerged as a viable technique to significantly enhance the load-carrying capacity, friction coefficient, and wear resistance of vital tribological components such as bearings, mechanical seals, piston rings, and the like. The size effect of the dimple, defined as the dimple with the same DOD ratio with different depth and diameter, can be ignored, as revealed by examining the results reported in Qiu and Khonsari.[12] the corresponding average pressures have considerable differences under some other operating conditions.

Results

Conclusion