Mechanics and modelling of high-frequency mechanical impact and its effect on fatigue

Abstract

High-frequency mechanical impact is a recent improvement method which is probably one of the most effective for treating welded assemblies. A number of experimental results relating to this process are presented in this article. These results lead to better understand the mechanisms of the process, to outline the influence of the operating parameters and to confirm the role played by the initial quality of treated welds. In addition, a process is proposed in order to numerically estimate the fatigue life improvement reached after treatment. All these results were obtained in the scope of a study whose long-term aim is to propose an approach that can be industrially applicable for fatigue design of welded assemblies treated by high-frequency mechanical impact.

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Notes

  1. 1.

    S355 equivalent steel grade dedicated to marine application.

  2. 2.

    An excessively high load will result in an excessively large indented zone and consequently an averaged result over this zone, whereas an excessively low load results in a decrease in the measurement accuracy and repeatability. This notably depends on the grain size which may be relatively significant in a heat-affected zone.

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Correspondence to Guénhaël Le Quilliec or Henri-Paul Lieurade.

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Doc. IIW-2322, recommended for publication by Commission XIII "Fatigue of Welded Components and Structures”.

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Le Quilliec, G., Lieurade, H., Bousseau, M. et al. Mechanics and modelling of high-frequency mechanical impact and its effect on fatigue. Weld World 57, 97–111 (2013). https://doi.org/10.1007/s40194-012-0013-3

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Keywords (IIW Thesaurus)

  • High frequency
  • Mechanical stress relief
  • Welding
  • Fatigue improvement
  • High strength steels
  • Indentation
  • Mechanical properties