Publications

Dong, Y. and Guedes Soares, C. (2015), “Estimation of effective notch strain for fatigue strength assessment of welded structures under multiaxial stress state”, Guedes Soares, C. Dejhalla R. and Pavletiæ D., (Eds.), Towards Green Marine Technology and Transport, Taylor & Francis Group, London, UK, pp. 397-406

Estimation approaches to calculate the effective notch strain, which is a parameter proposed to evaluate fatigue strength of welded structures in low and high cycle fatigue regions, was suggested in this study. Notch stress strain estimation methods including the Neuber´s and Equivalent Strain Energy Density rule in plane strain condition, generalized Neuber´s rule, lower and upper limits approach for a general mutiaxial stress state were introduced. Elastic and cyclic elasto-plastic finite element analyses were performed on a web-frame corner in ship structures. The finite element model was validated by comparing the results with those from tests. Comparison was made between the estimations and the cyclic elasto-plastic finite element analysis results. The Equivalent Strain Energy Density based approaches give the best estimation of the effective notch strain with about 40 percent overestimation and Neuber´s rule predicts the stress components very well. An application of the estimation approach was performed on load-carrying fillet-welded cruciform specimens to evaluate their lives by using the effective notch strain life mean curve.

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