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2D fracture mechanics analysis of HFMI treatment effects on the fatigue behaviour of structural steel welds

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Abstract

The purpose of this paper is to present the extension of a previously developed strain-based fracture mechanics (SBFM) model from one to two dimensions for simulating fatigue crack growth in steel arc welds. The one-dimensional (1D) SBFM model is first briefly reviewed. Steps for extending it to simulate 2D growth of a semi-elliptical surface crack in a weld are then described. An application of the new model is lastly presented, which consists of analysing the behaviour of structural steel weld specimens from a previously published fatigue test program, in which the fatigue performance of weld specimens was enhanced by high frequency mechanical impact (HFMI) treatment. In this application, the effect of the treatment-induced compressive residual stress on the crack shape is simulated, and it is shown how the extended 2D SBFM model can be used to establish probabilistic design stress-life (S-N) curves for various loading conditions.

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Support for this research provided by the NSERC Discovery Grant of the second author is gratefully acknowledged.

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Correspondence to Rakesh Ranjan.

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Recommended for publication by Commission XIII - Fatigue of Welded Components and Structures

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Ranjan, R., Walbridge, S. 2D fracture mechanics analysis of HFMI treatment effects on the fatigue behaviour of structural steel welds. Weld World 65, 1805–1819 (2021). https://doi.org/10.1007/s40194-021-01120-4

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  • DOI: https://doi.org/10.1007/s40194-021-01120-4

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