Experimental and numerical study of the elastic SCF of tubular joints

Mostafa Atteya, Ove Mikkelsen, John Wintle, Gerhard Ersdal

Research output: Contribution to journalArticlepeer-review


This paper provides data on stress concentration factors (SCFs) from experimental measurements on cruciform tubular joints of a chord and brace intersection under axial loading. High-fidelity finite element models were generated and validated against these measurements. Further, the statistical variation and the uncertainty in both experiments and finite element analysis (FEA) are studied, including the effect of finite element modelling of the weld profile, mesh size, element type and the method for deriving the SCF. A method is proposed for modelling such uncertainties in order to determine a reasonable SCF. Traditionally, SCF are determined by parametric formulae found in codes and standards and the paper also provides these for comparison. Results from the FEA generally show that the SCF increases with a finer mesh, 2nd order brick elements, linear extrapolation and a larger weld profile. Comparison between experimental SCFs indicates that a very fine mesh and the use of 2nd order elements is required to provide SCF on the safe side. It is further found that the parametric SCF equations in codes are reasonably on the safe side and a detailed finite element analysis could be beneficial if small gains in fatigue life need to be justified.
Original languageEnglish
Article number4220
Number of pages20
Issue number15
Early online date28 Jul 2021
Publication statusPublished - 31 Aug 2021


  • experimental testing
  • fatigue
  • finite element analysis (FEA)
  • hot spot stress (HSS)
  • offshore structures
  • stress concentration factors (SCF)
  • tubular joints


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