An Experimental Investigation of Tubular T-Joints Under Cyclic Loads

[+] Author and Article Information
S. M. Cheng

Institute for Aerospace Research, National Research Council Canada, Montreal Road, M-7, Ottawa, ON, Canada K1A 0R6

A. S. J. Swamidas

Memorial University of Newfoundland, St. John’s, NF, Canada A1B 3X5

W. Wallace, X. Wu

Institute for Aerospace Research, National Research Council Canada, Montreal Road, Ottawa, ON, Canada K1A 0R6

J. Offshore Mech. Arct. Eng 121(3), 137-143 (Aug 01, 1999) (7 pages) doi:10.1115/1.2829557 History: Received July 01, 1998; Revised April 07, 1999; Online December 17, 2007


This paper presents an experimental study of fatigue crack initiation and growth in tubular T-joints, simulating the extreme case of those used for offshore platforms. The crack locations and profiles were recorded and fractographic examinations were carried out to reveal the mechanisms of crack initiation, growth, and crack closure. The relationships between crack length/depth and the numbers of fatigue cycle were analyzed using the Paris equation. During testing, the static strain responses at selected gage locations were also recorded. The variations in the static strains caused by the formation and growth of cracks were correlated with fatigue cycles by a characteristic equation. These results and correlations are useful for understanding the fatigue damage process and for monitoring the development of such damage in tubular T-joints of offshore structures.

Copyright © 1999 by The American Society of Mechanical Engineers
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