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Fatigue crack curvature under the weld toe in an offshore tubular joint

Fatigue crack curvature under the weld toe in an offshore tubular joint
Fatigue crack curvature under the weld toe in an offshore tubular joint
Experimental tests on offshore tubular joints show that fatigue cracks, as well as curving around the brace/chord intersection, curve under the weld toe as they propagate through the chord wall. However, when producing stress intensity factor solutions for tubular joints, this curvature is usually ignored due to modelling difficulties. In this paper, detailed numerical models of surface cracks in tubular T-joints are used to simulate experimental observations of crack curvature reported in the literature. When compared with the experimental observations, the numerical results help to clarify the mechanism behind crack curvature. Based on the principal stress criterion, an approximate method for predicting crack curvature is proposed.
tubular joints, fatigue, crack curvature, stress intensity factors
0142-1123
841-490
Bowness, D.
8f1df5c0-39a8-44ca-aad7-2c57869e6631
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46
Bowness, D.
8f1df5c0-39a8-44ca-aad7-2c57869e6631
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46

Bowness, D. and Lee, M.M.K. (1998) Fatigue crack curvature under the weld toe in an offshore tubular joint. International Journal of Fatigue, 20 (6), 841-490.

Record type: Article

Abstract

Experimental tests on offshore tubular joints show that fatigue cracks, as well as curving around the brace/chord intersection, curve under the weld toe as they propagate through the chord wall. However, when producing stress intensity factor solutions for tubular joints, this curvature is usually ignored due to modelling difficulties. In this paper, detailed numerical models of surface cracks in tubular T-joints are used to simulate experimental observations of crack curvature reported in the literature. When compared with the experimental observations, the numerical results help to clarify the mechanism behind crack curvature. Based on the principal stress criterion, an approximate method for predicting crack curvature is proposed.

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More information

Published date: July 1998
Keywords: tubular joints, fatigue, crack curvature, stress intensity factors

Identifiers

Local EPrints ID: 75378
URI: https://eprints.soton.ac.uk/id/eprint/75378
ISSN: 0142-1123
PURE UUID: 275065c8-370b-4002-8b90-b2d1811370fb

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 04 Oct 2017 22:40

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Contributors

Author: D. Bowness
Author: M.M.K. Lee

University divisions

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