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Parametric equations for distributions of stress concentration factors in tubular K-joints under out-of-plane moment loading

Parametric equations for distributions of stress concentration factors in tubular K-joints under out-of-plane moment loading
Parametric equations for distributions of stress concentration factors in tubular K-joints under out-of-plane moment loading
An extensive parametric study, using finite elements, of the stress concentration factors in tubular K-joints commonly found in offshore platforms is presented. This study covers a comprehensive range of geometric joint parameters for unbalanced out-of-plane moment loading. The results of the study were first used to assess the widely used parametric equations of Efthymiou (Proceedings of the Conference on Recent Developments in Tubular Joints Technology, Surrey, 1988, p. 2–1) and Lloyds Register (Proceedings of the 1st International Society of Offshore Polar Engineers Conference, 1991, Edinburgh), which provide predictions of stress concentration factors at the saddle on the outer surfaces of the chord and the brace as a function of the joint geometric ratios. The database of thin shell finite element results generated was then used to develop parametric equations for predicting stress concentration factors at key locations around the joint intersection on the outer, as well as the inner, surfaces of the chord. The reliability of the proposed and existing parametric equations was then assessed using the acrylic joint database published by the UK Department of Energy (Draft Background to New Fatigue Design Guidance for Steel Joints and Connections in Offshore Structures, 1995). The paper concludes with fracture mechanics fatigue calculations to demonstrate that the information provided from the proposed equations could be utilised to obtain accurate, and safe, fatigue life estimates.
stress concentration, fatigue assessment, tubular K-joints, out-of-plane moment loading, finite elements, parametric equations
0142-1123
449-461
Morgan, M.R.
2b333082-6d38-49a4-ad86-ae3ebc8d55a5
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46
Morgan, M.R.
2b333082-6d38-49a4-ad86-ae3ebc8d55a5
Lee, M.M.K.
b0eec6ec-1557-494d-bbc5-4cd053cfbe46

Morgan, M.R. and Lee, M.M.K. (1998) Parametric equations for distributions of stress concentration factors in tubular K-joints under out-of-plane moment loading. International Journal of Fatigue, 20 (6), 449-461. (doi:10.1016/S0142-1123(98)00011-5).

Record type: Article

Abstract

An extensive parametric study, using finite elements, of the stress concentration factors in tubular K-joints commonly found in offshore platforms is presented. This study covers a comprehensive range of geometric joint parameters for unbalanced out-of-plane moment loading. The results of the study were first used to assess the widely used parametric equations of Efthymiou (Proceedings of the Conference on Recent Developments in Tubular Joints Technology, Surrey, 1988, p. 2–1) and Lloyds Register (Proceedings of the 1st International Society of Offshore Polar Engineers Conference, 1991, Edinburgh), which provide predictions of stress concentration factors at the saddle on the outer surfaces of the chord and the brace as a function of the joint geometric ratios. The database of thin shell finite element results generated was then used to develop parametric equations for predicting stress concentration factors at key locations around the joint intersection on the outer, as well as the inner, surfaces of the chord. The reliability of the proposed and existing parametric equations was then assessed using the acrylic joint database published by the UK Department of Energy (Draft Background to New Fatigue Design Guidance for Steel Joints and Connections in Offshore Structures, 1995). The paper concludes with fracture mechanics fatigue calculations to demonstrate that the information provided from the proposed equations could be utilised to obtain accurate, and safe, fatigue life estimates.

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More information

Published date: July 1998
Keywords: stress concentration, fatigue assessment, tubular K-joints, out-of-plane moment loading, finite elements, parametric equations

Identifiers

Local EPrints ID: 75377
URI: https://eprints.soton.ac.uk/id/eprint/75377
ISSN: 0142-1123
PURE UUID: 05f5942e-b49a-40e2-9488-baea81cd4bee

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Date deposited: 11 Mar 2010
Last modified: 18 Jul 2017 23:43

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Contributors

Author: M.R. Morgan
Author: M.M.K. Lee

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