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Article

A Robust Structural Stress Method for Fatigue Analysis of Offshore/Marine Structures

[+] Author and Article Information
P. Dong

Center for Welded Structures Research, Battelle, Columbus, OH 43016-2693e-mail: dongp@battelle.org

J. Offshore Mech. Arct. Eng 127(1), 68-74 (Mar 23, 2005) (7 pages) doi:10.1115/1.1854698 History: Received March 21, 2004; Revised May 23, 2004; Online March 23, 2005
Copyright © 2005 by ASME
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Figures

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Comparison of the structural stress results using the proposed method for a cover plate fillet weld: (a) Shell element model, (b) A 2D cross-section showing weld representation; (c) Comparison of structural stress results at weld toe with different element sizes and types
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Validation of mesh-size insensitivity in the structural stress calculations using the present procedures for a doubling-plate fillet joint investigated by Fricke 1
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Structural stress calculations for a tubular T joint used by Zerbst et al. 9: (a) T-joint geometry and loading conditions; (b) Four FE models with different element sizes; (c) Comparison of the current structural stress results along weld toe at chord
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Comparison of FEA surface stress distributions predicted by various modeling procedures and extrapolation based hot stress SCF predicted at the weld toe on attachment plate 1
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Generalized procedure for implementing virtual node method (E1, E2,[[ellipsis]], represent element numbers at weld toe)
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Mesh-size insensitivity demonstration for an edge detail investigated in 112: (a) FE models with drastically different element sizes; (b) comparison of structural stress distributions along weld toe on attachment plate
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Structural stress results using virtual node method—a RHS T-Joint
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Correlation of a large amount of existing weld S-N data from literature 6 using the proposed equivalent structural stress parameter in Eq. (4): (a) Nominal stress range versus N; (b) Equivalent structural stress range versus N
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Robust structural stress calculation procedures for curved weld with distorted mesh using shell/plate element models
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Through-thickness structural stresses definition: (a) Local stresses from FE model; (b) structural stress or far-field stress; (c) self-equilibrating stress and structural stress based estimation with respect to t1 (dashed lines)

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