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RESEARCH PAPERS

Fatigue of Drill String Connections

[+] Author and Article Information
F. P. Brennan

Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK

J. Offshore Mech. Arct. Eng 117(2), 126-132 (May 01, 1995) (7 pages) doi:10.1115/1.2827062 History: Received August 26, 1993; Revised September 26, 1994; Online December 17, 2007

Abstract

This paper reports full-scale tests on threaded connections used in drill strings. A concise background is given concerning the in-service environment and loading conditions on the connections. This details some of the reasons particular steels are used in preference to others. Crack growth data is given for ten full-scale axial and rotating bend tests. This is compared with predictions from a dedicated weight function fracture mechanics solution designed for threaded connections. Crack aspect ratio is considered with a view to development of an appropriate empirical model.

Copyright © 1995 by The American Society of Mechanical Engineers
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