Fully plastic crack opening analyses of complex-cracked pipes for Ramberg-Osgood materials

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The plastic influence functions for calculating fully plastic Crack opening displacement (COD) of complex-cracked pipes were newly proposed based on systematic 3-dimentional (3-D) elastic-plastic Finite element (FE) analyses using Ramberg-Osgood (R-O) relation, where global bending moment, axial tension and internal pressure are considered separately as a loading condition. Then, crack opening analyses were performed based on GE/EPRI concept by using the new plastic influence functions for complex-cracked pipes made of SA376 TP304 stainless steel, and the predicted CODs were compared with FE results based on deformation plasticity theory of tensile material behavior. From the comparison, the confidence of the proposed fully plastic crack opening solutions for complex-cracked pipes was gained. Therefore, the proposed engineering scheme for COD estimation using the new plastic influence functions can be utilized to estimate leak rate of a complex-cracked pipe for R-O material.

Original languageEnglish
Pages (from-to)1563-1572
Number of pages10
JournalJournal of Mechanical Science and Technology
Volume30
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1

Keywords

  • Complex crack
  • Crack opening displacement
  • Finite element analysis
  • GE/EPRI method
  • Plastic influence functions

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

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