From an operator/engineering perspective, the correct assessment of the severity of corrosion defects (e.g., pits) can have enormous economic, social and environmental benefits; therefore the development of a generally applicable and simple to apply procedure for fatigue assessment of key components is recognised as a valuable tool, seeking to reduce the current overly conservative procedures whilst maintaining structural integrity. The critical condition for a crack emanating from a pit (pit-to-crack transition) to start to propagate is analysed in this paper. The pitcrack configuration is re-characterized into that of a hemispherical crack of length equal to the pit depth, and this assumption is analysed by detailed 3D FEA. A propagation threshold approach is used to estimate the fatigue resistance from intrinsic material properties. The proposed approach is validated by comparison with experimental results available in the open literature.
Assessing Fatigue Endurance Limit of Pitted Specimens by Means of an Integrated Fracture Mechanics Approach
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Larrosa, NO, Chapetti, MD, & Ainsworth, RA. "Assessing Fatigue Endurance Limit of Pitted Specimens by Means of an Integrated Fracture Mechanics Approach." Proceedings of the ASME 2015 Pressure Vessels and Piping Conference. Volume 7: Operations, Applications and Components. Boston, Massachusetts, USA. July 19–23, 2015. V007T07A005. ASME. https://doi.org/10.1115/PVP2015-45562
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