Stress Concentration Factors in KT-Joints Subjected to Complex Bending Loads Using Artificial Neural Networks

Mohsin Iqbal*, Saravanan Karuppanan, Veeradasan Perumal, Mark Ovinis, Afzal Khan, Muhammad Faizan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Fatigue analysis of tubular joints based on peak stress concentration factor (SCF) is critical for offshore structures as it determines the fatigue life of the joint and possibly the overall structure. It is known that peak SCF occurs at the crown position for in-plane bending (IPB) and at the saddle position for out-of-plane bending (OPB). Tubular joints of offshore structures are under multiplanar bending, comprising IPB and OPB. When a joint is subjected to IPB and OPB loads simultaneously, the peak SCF occurs somewhere between the crown and the saddle. However, existing equations estimate SCF at the crown and saddle only when a joint is subjected to IPB or OPB. It was found that the position and magnitude of peak SCF under simultaneous IPB and OPB depend on the relative magnitudes of these uniplanar load components. The crown and saddle position SCF can be substantially lower than the cumulative peak SCF. Empirical models are proposed for computing peak SCF for KT-joints subjected to multiplanar bending. These models were developed through regression analysis using artificial neural networks (ANN). The ANN training data was generated through 3716 ANSYS finite element simulations. The empirical model was validated using models available in the literature and can determine peak SCF with an error of less than 1.5%.

Original languageEnglish
Pages (from-to)1051-1068
Number of pages18
JournalCivil Engineering Journal (Iran)
Volume10
Issue number4
DOIs
StatePublished - Apr 2024
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2024 by the authors.

Keywords

  • ANN
  • Empirical Modeling
  • Fatigue Analysis
  • Multiplanar Bending Load
  • Stress Concentration Factor
  • Tubular KT-Joint

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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