Approximate J estimates for axial part-through surface-cracked pipes

C. S. Oh, T. K. Song, Y. J. Kim, J. S. Kim, T. E. Jin

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

This paper provides net-section limit pressures and a reference stress based J estimation method for pipes with constant depth, internal axial surface cracks under internal pressure. Based on systematic small strain finite element (FE) limit analyses using elastic perfectly plastic materials, net-section limit pressures are firstly determined, and based on FE results, a closed-form limit pressure solution is proposed. Furthermore, based on the proposed limit pressure solution, a method to estimate elastic-plastic J is proposed based on the reference stress approach. When the reference stress is defined by the proposed (global) limit pressure, estimated J values based on the reference stress approach are overall slightly lower than FE results, implying that the method is non-conservative. By re-defining the reference using optimised reference loads, resulting J estimates agree well with FE results.

Original languageEnglish
Pages (from-to)1127-1139
Number of pages13
JournalFatigue and Fracture of Engineering Materials and Structures
Volume30
Issue number12
DOIs
Publication statusPublished - 2007 Dec 1
Externally publishedYes

Keywords

  • Axial part-through surface crack
  • Finite element analysis
  • J estimation
  • Limit pressure
  • Reference stress approach

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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