Net-section limit moments and approximate J estimates for circumferential cracks at the interface between elbows and pipes

Tae Kwang Song, Yun Jae Kim, Chang Kyun Oh, Tae Eun Jin, Jong Sung Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This paper firstly presents net-section limit moments for circumferential through-wall and part-through surface cracks at the interface between elbows and attached straight pipes under in-plane bending. Closed-form solutions are proposed based on fitting results from small strain FE limit analyses using elastic-perfectly plastic materials. Net-section limit moments for circumferential cracks at the interface between elbows and attached straight pipes are found to be close to those for cracks in the centre of elbows, implying that the location of the circumferential crack within an elbow has a minimal effect on the net-section limit moment. Accordingly it is also found that the assumption that the crack locates in a straight pipe could significantly overestimate the net-section limit load (and thus maximum load-carrying capacity) of the cracked component. Based on the proposed net-section limit moment, a method to estimate elastic-plastic J based on the reference stress approach is proposed for circumferential cracks at the interface between elbows and attached straight pipes under in-plane bending.

Original languageEnglish
Pages (from-to)495-507
Number of pages13
JournalInternational Journal of Pressure Vessels and Piping
Volume86
Issue number8
DOIs
Publication statusPublished - 2009 Aug 1
Externally publishedYes

Keywords

  • Circumferential crack
  • Elastic-plastic J
  • Elbow
  • Finite element limit analysis
  • In-plane bending
  • Net-section limit load
  • Reference stress approach

ASJC Scopus subject areas

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

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