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- W2015725361 abstract "Abstract Due to the severe cyclic environmental loading experienced by offshore structures in the North Sea, fatigue has been identified as one of the most important causes affecting the long-term structural integrity of the welded tubular joints on these structures. Fatigue damage appears in the form of fatigue crack growth. Maintenance of structural integrity therefore concentrates on carrying out periodic in-service inspection and integrity assessment of the intact and cracked structures. The aims of the maintenance programme are to ensure that either no crack is present in the structures, or if cracks are discovered, that the remaining joints are still ‘fit’ for their purpose in terms of fatigue life and static capacity. The key information linking the in-service inspection and integrity assessment is the size of the cracks. Although the crack depth is the controlling variable for fatigue analysis, both depth and length of the surface breaking cracks are needed for the assessment of remaining ultimate capacity. In the past it was.found to be difficult to correlate the analytical prediction of crack aspect ratio (depth to half-length ratio) development with measured values from full-scale test results. Many integrity assessments therefore used a predefined aspect ratio pattern for the analysis. This paper reports an extension of a methodology in order to produce a better correlation between predicted and measured aspect ratio patterns. The methodology is based on fracture mechanics analysis with structural modelling.for cracked tubular joints. The paper reviews briefly the recent progress in the analysis of fatigue crack growth in tubular joints and outlines how the new methodology i.s formulated. The results showed that the methodology was adequate.for predicting aspect ratio growth for cracks deeper than 25% of the chord wall thickness." @default.
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- W2015725361 date "1995-01-01" @default.
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- W2015725361 title "The prediction of crack shape development for in-service cracks in offshore welded tubular joints" @default.
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- W2015725361 doi "https://doi.org/10.1016/0951-8339(95)90664-g" @default.
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