Effect of Clearance on Rotary Rock Bit Journal Bearing Contact Stress

[+] Author and Article Information
K. M. Marshek, H. H. Chen

Department of Mechanical Engineering, The University of Texas at Austin, Austin, Tex. 78712

J. Energy Resour. Technol 108(1), 1-7 (Mar 01, 1986) (7 pages) doi:10.1115/1.3231235 History: Received October 19, 1984; Revised August 26, 1985; Online October 22, 2009


This paper presents a numerical method for analyzing the effect of clearance on closely conforming rotary rock bit journal bearings. The modified Boussinesq point-force displacement influence function and the modified profile function are introduced in conjunction with the discretization of the integral equation. Automatic mesh generation is employed to redefine a new pressure area boundary and therefore round-off errors normally found while solving a large-scale linear system of equations can be avoided. The numerical method has been implemented in a computer program and has been applied to the problems of misaligned and perfectly aligned conformal contact. There is a close agreement with the Persson’s analytical solution at the center of the aligned bearing length. However, owing to a high stress concentration at the bearing edge, the edge pressure distribution will differ significantly from the Persson’s plane stress model. The conformal contact will have a comparatively higher peak pressure and lower contact-angle than the Hertzian line contact prediction. The results of the analysis provides a design tool for improving drill bit life.

Copyright © 1986 by ASME
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