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.
- Pressure Vessels and Piping
Fracture Assessment Procedures for Steel Pipelines Using a Modified Reference Stress Solution
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Tkaczyk, T, O’Dowd, NP, & Nikbin, K. "Fracture Assessment Procedures for Steel Pipelines Using a Modified Reference Stress Solution." Proceedings of the ASME 2008 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication, Parts A and B. Chicago, Illinois, USA. July 27–31, 2008. pp. 1243-1257. ASME. https://doi.org/10.1115/PVP2008-61024
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