An accurate defect assessment procedure is needed to ensure integrity of girth welded steel pipelines while avoiding unnecessary repairs. An integral part of such a procedure is an estimation scheme for the crack driving force. In this work, a modified reference stress solution was developed for the assessment of elastic-plastic pipes with surface breaking defects. For the particular case of interest (reeled offshore pipelines), the loading is phrased in terms of applied strain. The stress-based approach has therefore been extended to the case of strain/displacement control. The results obtained using the modified reference stress solution have been compared with a three-dimensional finite-element analysis. Very good agreement has been obtained. The predictions are also significantly better than those obtained from existing approaches. A comparison between the proposed method and full scale testing will be presented in a separate paper.
Fracture Assessment Procedures for Steel Pipelines Using a Modified Reference Stress Solution
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Tkaczyk, T., O’Dowd, N. P., and Nikbin, K. (April 29, 2009). "Fracture Assessment Procedures for Steel Pipelines Using a Modified Reference Stress Solution." ASME. J. Pressure Vessel Technol. June 2009; 131(3): 031409. https://doi.org/10.1115/1.3122769
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