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• W3107510979 abstract "Fatigue lifetime of offshore pipelines with semi-elliptical circumferential surface cracks is often underestimated. An accurate prediction of the pipeline structural integrity is nevertheless important in order to prevent unnecessary and expensive downtime, failures leading to leakage or spillage of pipeline contents to the surrounding environment, and ultimately improve the reliability of the pipeline. The estimation of crack growth in pipelines under varying loads is highly dependent on the calculation of crack driving parameters, such as the stress intensity factor and the crack tip opening displacement (CTOD) using the 3D J-integral or its equivalent. This paper presents a numerical study to predict the fatigue lifetime of cracks in pipes, determining the J-integral that includes first and second derivatives of the displacement field for pipes containing a range of circumferential surface cracks. A pipe segment is structurally loaded and stress intensity factors (SIF) evaluated using the finite element method (FEM). Based on the results, a number-of-cycles to failure curve shows a longer lifetime than previously predicted by about 5% for a pipe with semi-elliptical external surface cracks. In addition, they indicate that the external short cracks are more dangerous than the internal long surface crack hereby requiring earlier assessment." @default.
• W3107510979 created "2020-12-07" @default.
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• W3107510979 date "2020-11-24" @default.
• W3107510979 modified "2023-10-16" @default.
• W3107510979 title "Finite Element Analysis of Fatigue in Offshore Pipelines with Internal and External Circumferential Cracks" @default.
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• W3107510979 doi "https://doi.org/10.3390/applmech1040013" @default.
• W3107510979 hasPublicationYear "2020" @default.
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