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RESEARCH PAPERS

Reliability of Welded Structures Containing Fatigue Cracks

[+] Author and Article Information
D. Lanning, M.-H. H. Shen

Department of Aerospace Engineering, Applied Mechanics and Aviation, 328 Bolz Hall, 2036 Neil Avenue, The Ohio State University, Columbus, OH 43210-1276

J. Offshore Mech. Arct. Eng 118(4), 300-306 (Nov 01, 1996) (7 pages) doi:10.1115/1.2833920 History: Received October 17, 1995; Revised March 11, 1996; Online January 25, 2008

Abstract

This study investigates the reliability of a cracked fillet welded T-joint typically found in offshore structures. A formulation for the aspect ratio (a/c) of a propagating semi-elliptical fatigue crack located at the toe of the weld is developed using Newman and Raju’s stress intensity factor for a cracked flat plate in conjunction with a weld magnification factor. The reliability in terms of fatigue lifetime is then calculated using the aspect ratio and Paris’s law of crack propagation with both fracture toughness and elastic-plastic failure criteria. The variation in crack aspect ratio in the T-joint is compared to that in a cracked flat plate, and examples are provided of reliability calculations for tension and bending loads.

Copyright © 1996 by The American Society of Mechanical Engineers
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