Size effect of welded thin-walled tubular joints

Fidelis Rutendo Mashiri, Xiao Ling Zhao, Manfred A. Hirt, Alain Nussbaumer

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


This paper clarifies the terminologies used to describe the size effect on fatigue behavior of welded joints. It summarizes the existing research on size effect in the perspective of newly defined terminologies. It identifies knowledge gaps in designing tubular joints using the hot spot stress method, i.e. thin-walled tubular joints with wall thickness less than 4 mm and thick-walled tubular joints with wall thickness larger than 50mm, or diameter to thickness ratio less than 24. It is the thin-walled tubular joints that are addressed in this paper. It is found that thin-walled tube-plate T-joints do not follow the conventional trend: the thinner the section is, the higher the fatigue life. It is also found that simple extrapolation of existing fatigue design curves may result in unsafe design of thin-walled tube-tube T-joints. The effect of chord stiffness on fatigue behavior of thin-walled tubular T-joints is also discussed.

Original languageEnglish
Pages (from-to)101-127
Number of pages27
JournalInternational Journal of Structural Stability and Dynamics
Issue number1
Publication statusPublished - Mar 2007
Externally publishedYes


  • Fatigue
  • Plate
  • Size effect
  • Thickness effect
  • Tube
  • Weld defects
  • Welded joints

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Aerospace Engineering
  • Ocean Engineering
  • Mechanical Engineering
  • Applied Mathematics


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