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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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Funding

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

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Authors and Affiliations

  1. Department of Civil, Geological and Mining Engineering, Polytechnique Montreal, Montreal, QC, Canada

    Rakesh Ranjan

  2. Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON, Canada

    Scott Walbridge

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  1. Rakesh Ranjan
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  2. Scott Walbridge
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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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