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Stress intensity factor solutions for semi-elliptical weld-toe cracks in T-butt geometries

Stress intensity factor solutions for semi-elliptical weld-toe cracks in T-butt geometries
Stress intensity factor solutions for semi-elliptical weld-toe cracks in T-butt geometries
Weld toe magnification factors are widely used in the evaluation of stress intensity factors for cracks in welded structures. Traditionally, the weld magnification factor has been determined from 2-D plane strain models containing edge cracks. However, it has long been recognised that a semi-elliptical weld toe crack cannot be accurately represented by a 2-D approximation due to the 3-D nature of the geometry. As a consequence, some recent research has been carried out using 3-D numerical modelling, which highlights the limitations of the 2-D approach. Nevertheless, 3-D solutions are still scarce and are of limited validity due to the difficulties associated with creating the numerical models. This paper reports the most extensive 3-D numerical investigation of semi-elliptical cracks in T-butt geometries to date. Based on the numerical results, new and accurate equations for weld magnification factors were derived, which quantify the 3-D effects present and emphasise the importance of the attachment. The results obtained from these equations are then used in an assessment of existing solutions.
stress intensity factors, weld toe cracks, finite elements, t-butts, fatigue assessment
8756-758X
787-797
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. (1996) Stress intensity factor solutions for semi-elliptical weld-toe cracks in T-butt geometries. Fatigue & Fracture of Engineering Materials & Structures, 19 (6), 787-797. (doi:10.1111/j.1460-2695.1996.tb01323.x).

Record type: Article

Abstract

Weld toe magnification factors are widely used in the evaluation of stress intensity factors for cracks in welded structures. Traditionally, the weld magnification factor has been determined from 2-D plane strain models containing edge cracks. However, it has long been recognised that a semi-elliptical weld toe crack cannot be accurately represented by a 2-D approximation due to the 3-D nature of the geometry. As a consequence, some recent research has been carried out using 3-D numerical modelling, which highlights the limitations of the 2-D approach. Nevertheless, 3-D solutions are still scarce and are of limited validity due to the difficulties associated with creating the numerical models. This paper reports the most extensive 3-D numerical investigation of semi-elliptical cracks in T-butt geometries to date. Based on the numerical results, new and accurate equations for weld magnification factors were derived, which quantify the 3-D effects present and emphasise the importance of the attachment. The results obtained from these equations are then used in an assessment of existing solutions.

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More information

Published date: June 1996
Keywords: stress intensity factors, weld toe cracks, finite elements, t-butts, fatigue assessment

Identifiers

Local EPrints ID: 75372
URI: http://eprints.soton.ac.uk/id/eprint/75372
ISSN: 8756-758X
PURE UUID: 28d8aa59-28a7-447b-8374-3d553141a2c6

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Date deposited: 11 Mar 2010
Last modified: 13 Mar 2024 22:51

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Contributors

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

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