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Estimation of stress concentrations in single-sided welds in offshore tubular structures

Estimation of stress concentrations in single-sided welds in offshore tubular structures
Estimation of stress concentrations in single-sided welds in offshore tubular structures
Single sided welds commonly used for connecting braces to chords in tubular joints for offshore structures are known to have failed from cracks initiated at the root of the weld. There is currently no common industry standard to assess the fatigue performance of single-sided welds and hence guidelines on this issue are urgently needed. Fatigue assessment of single-sided welds requires knowledge of the stress concentrations in the weld root. The parametric study reported herein investigated the ratio of the maximum internal to maximum external weld SCF, the R ratio, in K-, Y-, X- and T-joints. The study, conducted using three-dimensional solid finite element models, generated a database of internal SCFs for the above joint types under axial, in-plane and out-of-plane bending loadings. Design equations for calculating R for each joint type for various loading modes, developed from multiple regression analyses, are proposed.

stress concentrations, single-sided welds, tubular joints, offshore structures, finite element analysis
0142-1123
895-908
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46

Lee, M.M.K. (1999) Estimation of stress concentrations in single-sided welds in offshore tubular structures. International Journal of Fatigue, 21 (9), 895-908. (doi:10.1016/S0142-1123(99)00083-3).

Record type: Article

Abstract

Single sided welds commonly used for connecting braces to chords in tubular joints for offshore structures are known to have failed from cracks initiated at the root of the weld. There is currently no common industry standard to assess the fatigue performance of single-sided welds and hence guidelines on this issue are urgently needed. Fatigue assessment of single-sided welds requires knowledge of the stress concentrations in the weld root. The parametric study reported herein investigated the ratio of the maximum internal to maximum external weld SCF, the R ratio, in K-, Y-, X- and T-joints. The study, conducted using three-dimensional solid finite element models, generated a database of internal SCFs for the above joint types under axial, in-plane and out-of-plane bending loadings. Design equations for calculating R for each joint type for various loading modes, developed from multiple regression analyses, are proposed.

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More information

Published date: October 1999
Keywords: stress concentrations, single-sided welds, tubular joints, offshore structures, finite element analysis

Identifiers

Local EPrints ID: 75382
URI: http://eprints.soton.ac.uk/id/eprint/75382
ISSN: 0142-1123
PURE UUID: 65ba388e-ede6-4392-b701-b91bb25b78ff

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Date deposited: 11 Mar 2010
Last modified: 17 Jul 2019 00:15

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Author: M.M.K. Lee

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