Engineering critical assessment for a sandwich pipe field joint

Ikechukwu Onyegiri, Maria Kashtalyan (Corresponding Author)

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Abstract

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
Volume172
Early online date29 Dec 2018
DOIs
Publication statusPublished - 15 Jan 2019

Keywords

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

ASJC Scopus subject areas

  • Ocean Engineering
  • Environmental Engineering

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