Engineering critical assessment for a sandwich pipe field joint

Ikechukwu Onyegiri, Maria Kashtalyan* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
33 Downloads (Pure)


This paper seeks to apply a combination of techniques with the aim of outlining a finite element (FE) based methodology for carrying out Engineering Critical Assessment on the swage weld for J-lay installation. The critical potential defect position during installation is identified and its severity is evaluated using the Stress Concentration Factor (SCF). Closed-form parametric equations for quantifying the geometric SCF as a function of the swage weld dimensions are derived using large-scale parametric studies and statistical analysis for the joint under tension. The maximum allowable defect size for a swaged weld under potential installation loadings is evaluated by two proposed FE-based fracture mechanics methodologies. In the absence of tearing resistance data, the influence of the filler resin stiffness, loading type and material response on the acceptability of a defect size is studied and the conservative nature of brittle fracture design for the fracture assessment of carbon steel pipelines with significant ductility is illustrated.
Original languageEnglish
Pages (from-to)788-802
Number of pages15
JournalOcean Engineering
Early online date29 Dec 2018
Publication statusPublished - 15 Jan 2019


  • Swage weld
  • J-lay installation
  • finite element modelling
  • stress concentration
  • closed-form equation
  • Stress concentration
  • Finite element modelling
  • Swaged weld
  • Closed-form equation


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