Fatigue strength modelling of high-performing welded joints

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Abstract

This paper investigates the fatigue strength modelling of high-performing welded steel joints. The work considers the strain-based, notch stress, averaged strain energy density approaches, and linear elastic fracture mechanics. A comparison of the methods with experimental data shows that the predictions vary significantly for different modelling assumptions. Only the microstructure-sensitive strain-based approach can predict the fatigue life of various weld geometries and plate thicknesses. The explicit modelling of the localised plasticity using the microstructure-dependent representative volume element is required for accurate prediction of the short crack initiation and growth periods, which dominate the fatigue life modelling of high-performing welds.
Original languageEnglish
Article number105555
JournalINTERNATIONAL JOURNAL OF FATIGUE
Volume135
DOIs
Publication statusPublished - Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Fatigue strength
  • Welded joint
  • Strain-based approach
  • Notch stress approach
  • Strain energy density

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  • Projects

    Microstructure-based Continuum Damage Modelling of Fatigue in High-performance Welds

    Sarikka, T., Malitckii, E., Lehto, P., Åman, M., Remes, H., Gallo, P. & Liinalampi, S.

    01/09/201631/12/2020

    Project: Academy of Finland: Other research funding

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