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Publications
Dong, Y. and Guedes Soares, C. (2017) , “Uncertainty analyses of local strain and fatigue crack initiation life of welded joints under plane strain condition”, Progress in the Analysis and Design of Marine Structures, Guedes Soares, C. & Garbatov Y. (Eds.), Taylor & Francis Group, London, UK, pp. 349-359
The objective of this work is to evaluate the uncertainty of local strain and fatigue crack initiation life of welded joints subjected to axial loading under plane strain condition. An approach based on Monte Carlo simulation is used to evaluate the uncertainty due to the randomness of geometrical and material parameters and the model uncertainty of five simplified estimation methods. The elastic-plastic finite element method is employed in the uncertainty analysis and treated as the reference method in the model uncertainty analysis. It turns out that the uncertainty in the local strain amplitude and fatigue crack initiation life is significant. The high cycle fatigue resistant curve recommended by rules may be not conservative in the low cycle region, if the fatigue crack initiation life dominates. The model error varies with the nominal stress amplitude. The methods based on the Equivalent Strain Energy Density may be good at low level of the nominal stress amplitude and the generalized Neuber’s rule seems to be useful considering its conservatism and small bias in comparison with other estimation methods.
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