RESEARCH PAPERS: Offshore Mechanics

Fatigue Crack Growth Analyses of Offshore Structural Tubular Joint

[+] Author and Article Information
H. C. Rhee

Conoco, Inc., Ponca City, OK 74603

J. Offshore Mech. Arct. Eng 111(1), 49-55 (Feb 01, 1989) (7 pages) doi:10.1115/1.3257138 History: Received January 01, 1987; Revised May 18, 1988; Online October 30, 2009


Fracture mechanics fatigue life estimation procedures have been developed for offshore structural tubular joints through analyzing a K-joint under the North Sea environment. The objective of this study was to establish reliable procedures for estimating the remaining fatigue life of a tubular joint with cracklike defects. The analysis approach was the utilization of fracture mechanics methods for fatigue crack growth and failure analyses. In this study, the fully mixed mode stress intensity factors of weld toe surface flaws of the K-joint, which were calculated through detailed three-dimensional finite element analyses, were used for fatigue crack growth simulation. For the failure analyses, the failure assessment diagram method was used to predict the conditions for brittle fracture during fatigue crack propagation. The loading conditions considered in the analyses are the brace axial force, in and out-of-plane bending, and torsion.

Copyright © 1989 by ASME
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