Mode-{I, III} multiaxial fatigue of welded joints in steel maritime structures: Effective notch stress based resistance incorporating strength and mechanism contributions

Gabriele Bufalari, Henk den Besten*, Miroslaw Lech Kaminski

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The response of maritime structures can be multiaxial, involving predominant mode-I and non-negligible mode-III components. Adopting a stress distribution formulation based effective notch stress as fatigue strength parameter for mixed mode-{I, III} multiaxial fatigue assessment purposes, a mode-I equivalent von Mises type of failure criterion has been established at the critical fracture plane. Counting includes a cycle-by-cycle non-proportionality measure and damage accumulation is based on a linear model. Distinguished mode specific and material characteristic strength and mechanism contributions in terms of respectively the resistance curve intercept and mean stress induced response ratio coefficient, resistance curve slope and material characteristic length, have been incorporated. Evaluating the mid-cycle fatigue resistance, the outperformance is impressive. The analysed multiaxial mode-{I, III} data fits the uniaxial mode-I reference data scatter band and a single resistance curve can be used for fatigue assessment.

Original languageEnglish
Article number108067
Number of pages18
JournalInternational Journal of Fatigue
Volume180
DOIs
Publication statusPublished - 2024

Keywords

  • Effective notch stress
  • Fatigue
  • Multiaxiality
  • Strength and mechanism
  • Welded joints

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