Crack opening analysis of complex cracked pipes

Yun-Jae Kim, Nam Su Huh, Young Jin Kim

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Based on the reference stress approach, two sets of the crack opening displacement (COD) estimation equations are proposed for a complex cracked pipe. One set of equations can be used for the case when full stress-strain data are known, and the other for the case when only yield and tensile strengths are available. To define the reference stress, a simple plastic limit analysis for the complex cracked pipe subject to combined bending and tension is performed, considering the crack closure effect in the compressive-stressed region. Comparison with ten published test data and the results from the existing method shows that the present method not only reduces non-conservatism associated with the existing method, but also provides consistent and overall satisfactory results. These results provide sufficient confidence in the use of the present method to estimate the COD (and thus the leak rate) for the Leak-before-Break (LBB) analysis of complex cracked pipes. Finally, the J-estimation equations are also provided for complex cracked pipes, for the LBB analysis of complex cracked pipes.

Original languageEnglish
Pages (from-to)71-86
Number of pages16
JournalInternational Journal of Fracture
Volume111
Issue number1
DOIs
Publication statusPublished - 2001 Jan 1
Externally publishedYes

Fingerprint

Crack
Pipe
Cracks
Crack Closure
Limit Analysis
Crack closure
Tensile Strength
Confidence
Yield stress
Plastics
Tensile strength
Sufficient
Estimate

Keywords

  • Complex cracked pipe
  • Crack opening displacement
  • J-integral
  • Leak-before-break
  • References stress approach

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Mechanics of Materials

Cite this

Crack opening analysis of complex cracked pipes. / Kim, Yun-Jae; Huh, Nam Su; Kim, Young Jin.

In: International Journal of Fracture, Vol. 111, No. 1, 01.01.2001, p. 71-86.

Research output: Contribution to journalArticle

Kim, Yun-Jae ; Huh, Nam Su ; Kim, Young Jin. / Crack opening analysis of complex cracked pipes. In: International Journal of Fracture. 2001 ; Vol. 111, No. 1. pp. 71-86.
@article{58231a5f46c244d799d3366f3d417f82,
title = "Crack opening analysis of complex cracked pipes",
abstract = "Based on the reference stress approach, two sets of the crack opening displacement (COD) estimation equations are proposed for a complex cracked pipe. One set of equations can be used for the case when full stress-strain data are known, and the other for the case when only yield and tensile strengths are available. To define the reference stress, a simple plastic limit analysis for the complex cracked pipe subject to combined bending and tension is performed, considering the crack closure effect in the compressive-stressed region. Comparison with ten published test data and the results from the existing method shows that the present method not only reduces non-conservatism associated with the existing method, but also provides consistent and overall satisfactory results. These results provide sufficient confidence in the use of the present method to estimate the COD (and thus the leak rate) for the Leak-before-Break (LBB) analysis of complex cracked pipes. Finally, the J-estimation equations are also provided for complex cracked pipes, for the LBB analysis of complex cracked pipes.",
keywords = "Complex cracked pipe, Crack opening displacement, J-integral, Leak-before-break, References stress approach",
author = "Yun-Jae Kim and Huh, {Nam Su} and Kim, {Young Jin}",
year = "2001",
month = "1",
day = "1",
doi = "10.1023/A:1010945514752",
language = "English",
volume = "111",
pages = "71--86",
journal = "International Journal of Fracture",
issn = "0376-9429",
publisher = "Springer Netherlands",
number = "1",

}

TY - JOUR

T1 - Crack opening analysis of complex cracked pipes

AU - Kim, Yun-Jae

AU - Huh, Nam Su

AU - Kim, Young Jin

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Based on the reference stress approach, two sets of the crack opening displacement (COD) estimation equations are proposed for a complex cracked pipe. One set of equations can be used for the case when full stress-strain data are known, and the other for the case when only yield and tensile strengths are available. To define the reference stress, a simple plastic limit analysis for the complex cracked pipe subject to combined bending and tension is performed, considering the crack closure effect in the compressive-stressed region. Comparison with ten published test data and the results from the existing method shows that the present method not only reduces non-conservatism associated with the existing method, but also provides consistent and overall satisfactory results. These results provide sufficient confidence in the use of the present method to estimate the COD (and thus the leak rate) for the Leak-before-Break (LBB) analysis of complex cracked pipes. Finally, the J-estimation equations are also provided for complex cracked pipes, for the LBB analysis of complex cracked pipes.

AB - Based on the reference stress approach, two sets of the crack opening displacement (COD) estimation equations are proposed for a complex cracked pipe. One set of equations can be used for the case when full stress-strain data are known, and the other for the case when only yield and tensile strengths are available. To define the reference stress, a simple plastic limit analysis for the complex cracked pipe subject to combined bending and tension is performed, considering the crack closure effect in the compressive-stressed region. Comparison with ten published test data and the results from the existing method shows that the present method not only reduces non-conservatism associated with the existing method, but also provides consistent and overall satisfactory results. These results provide sufficient confidence in the use of the present method to estimate the COD (and thus the leak rate) for the Leak-before-Break (LBB) analysis of complex cracked pipes. Finally, the J-estimation equations are also provided for complex cracked pipes, for the LBB analysis of complex cracked pipes.

KW - Complex cracked pipe

KW - Crack opening displacement

KW - J-integral

KW - Leak-before-break

KW - References stress approach

UR - http://www.scopus.com/inward/record.url?scp=0035447702&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035447702&partnerID=8YFLogxK

U2 - 10.1023/A:1010945514752

DO - 10.1023/A:1010945514752

M3 - Article

VL - 111

SP - 71

EP - 86

JO - International Journal of Fracture

JF - International Journal of Fracture

SN - 0376-9429

IS - 1

ER -