Engineering Approach Based on Reference Stress Concept for Calculating J and Crack Opening Displacement of Complex-Cracked Pipes

Jae Uk Jeong, Jae Boong Choi, Nam Su Huh, Do Jun Shim, Yun-Jae Kim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

In this study, an engineering approach for estimations of fracture mechanics parameters, i.e., J-integral and crack opening displacement (COD), for complex-cracked pipes was suggested based on reference stress concept, where stress-strain data of the material was used to assess structural integrity of complex-cracked pipes. In the present study, new reference loads that can reduce the dependency on strain hardening of the material have been suggested for complex-cracked pipes under each loading mode. By using the proposed optimized reference load for complex-cracked pipes, J-integral and COD estimation procedures have been proposed based on the reference stress concept together with the elastic solutions for complex-cracked pipes. The predicted J-integrals and CODs based on the proposed method have been validated against published experimental data and FE results using actual stress-strain data. Moreover, the predictions using the proposed methods are also compared with those using the existing solutions for simple through-wall cracks (TWCs) based on reduced thickness analogy concept.

Original languageEnglish
Article number031206
JournalJournal of Pressure Vessel Technology, Transactions of the ASME
Volume139
Issue number3
DOIs
Publication statusPublished - 2017 Jun 1

Keywords

  • Complex crack
  • crack opening displacement
  • enhanced reference stress method
  • finite-element analysis
  • J-integral

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering

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