Comments on probabilistic fracture mechanics analysis of cracked components

Nam Su Huh, Do Jun Shim, Yun-Jae Kim, Kyu Ho Lee, Young Jin Kim

Research output: Contribution to journalArticle

Abstract

This paper investigates the effect of elastic-plastic J estimate on calculated failure probabilities for cracked components. To investigate effect of elastic-plastic J estimate on failure probabilities, firstly circumferential through-wall cracked pipes under pure bending is considered, which is important in the leak-before-break analysis. For the analysis, scatters in the applied load, mechanical and fracture properties are considered using normal and log-normal distributions. More importantly, the applied elastic-plastic J-integral is estimated according to four different estimation methods. Resulting failure probabilities are calculated using the efficient first-order reliability method (FORM). The results show that failure probabilities can be significantly different, depending on the elastic-plastic J estimate, suggesting that absolute failure probabilities might have less significance. Based on these investigations, the accuracy of elastic-plastic defect assessment method embedded in API RP579, popularly used in petrochemical industry for integrity assessment of defective structures, is systematically investigated based on the 3-D finite element analyses. The results show that the J estimate in API RP579 can be highly inaccurate for some cases, which in turn would affect failure probabilities.

Original languageEnglish
Pages (from-to)1755-1760
Number of pages6
JournalKey Engineering Materials
Volume270-273
Issue numberIII
Publication statusPublished - 2004 Nov 25

Fingerprint

Fracture mechanics
Plastics
Application programming interfaces (API)
Normal distribution
Petrochemicals
Pipe
Defects
Industry

Keywords

  • First Order Reliability Method
  • Leak-Before-Break
  • Monte Carlo
  • Probabilistic Fracture Mechanics
  • Reference Stress

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemical Engineering (miscellaneous)

Cite this

Huh, N. S., Shim, D. J., Kim, Y-J., Lee, K. H., & Kim, Y. J. (2004). Comments on probabilistic fracture mechanics analysis of cracked components. Key Engineering Materials, 270-273(III), 1755-1760.

Comments on probabilistic fracture mechanics analysis of cracked components. / Huh, Nam Su; Shim, Do Jun; Kim, Yun-Jae; Lee, Kyu Ho; Kim, Young Jin.

In: Key Engineering Materials, Vol. 270-273, No. III, 25.11.2004, p. 1755-1760.

Research output: Contribution to journalArticle

Huh, NS, Shim, DJ, Kim, Y-J, Lee, KH & Kim, YJ 2004, 'Comments on probabilistic fracture mechanics analysis of cracked components', Key Engineering Materials, vol. 270-273, no. III, pp. 1755-1760.
Huh, Nam Su ; Shim, Do Jun ; Kim, Yun-Jae ; Lee, Kyu Ho ; Kim, Young Jin. / Comments on probabilistic fracture mechanics analysis of cracked components. In: Key Engineering Materials. 2004 ; Vol. 270-273, No. III. pp. 1755-1760.
@article{49f7aea842c24d16b8adb101b81d5ddc,
title = "Comments on probabilistic fracture mechanics analysis of cracked components",
abstract = "This paper investigates the effect of elastic-plastic J estimate on calculated failure probabilities for cracked components. To investigate effect of elastic-plastic J estimate on failure probabilities, firstly circumferential through-wall cracked pipes under pure bending is considered, which is important in the leak-before-break analysis. For the analysis, scatters in the applied load, mechanical and fracture properties are considered using normal and log-normal distributions. More importantly, the applied elastic-plastic J-integral is estimated according to four different estimation methods. Resulting failure probabilities are calculated using the efficient first-order reliability method (FORM). The results show that failure probabilities can be significantly different, depending on the elastic-plastic J estimate, suggesting that absolute failure probabilities might have less significance. Based on these investigations, the accuracy of elastic-plastic defect assessment method embedded in API RP579, popularly used in petrochemical industry for integrity assessment of defective structures, is systematically investigated based on the 3-D finite element analyses. The results show that the J estimate in API RP579 can be highly inaccurate for some cases, which in turn would affect failure probabilities.",
keywords = "First Order Reliability Method, Leak-Before-Break, Monte Carlo, Probabilistic Fracture Mechanics, Reference Stress",
author = "Huh, {Nam Su} and Shim, {Do Jun} and Yun-Jae Kim and Lee, {Kyu Ho} and Kim, {Young Jin}",
year = "2004",
month = "11",
day = "25",
language = "English",
volume = "270-273",
pages = "1755--1760",
journal = "Key Engineering Materials",
issn = "1013-9826",
publisher = "Trans Tech Publications",
number = "III",

}

TY - JOUR

T1 - Comments on probabilistic fracture mechanics analysis of cracked components

AU - Huh, Nam Su

AU - Shim, Do Jun

AU - Kim, Yun-Jae

AU - Lee, Kyu Ho

AU - Kim, Young Jin

PY - 2004/11/25

Y1 - 2004/11/25

N2 - This paper investigates the effect of elastic-plastic J estimate on calculated failure probabilities for cracked components. To investigate effect of elastic-plastic J estimate on failure probabilities, firstly circumferential through-wall cracked pipes under pure bending is considered, which is important in the leak-before-break analysis. For the analysis, scatters in the applied load, mechanical and fracture properties are considered using normal and log-normal distributions. More importantly, the applied elastic-plastic J-integral is estimated according to four different estimation methods. Resulting failure probabilities are calculated using the efficient first-order reliability method (FORM). The results show that failure probabilities can be significantly different, depending on the elastic-plastic J estimate, suggesting that absolute failure probabilities might have less significance. Based on these investigations, the accuracy of elastic-plastic defect assessment method embedded in API RP579, popularly used in petrochemical industry for integrity assessment of defective structures, is systematically investigated based on the 3-D finite element analyses. The results show that the J estimate in API RP579 can be highly inaccurate for some cases, which in turn would affect failure probabilities.

AB - This paper investigates the effect of elastic-plastic J estimate on calculated failure probabilities for cracked components. To investigate effect of elastic-plastic J estimate on failure probabilities, firstly circumferential through-wall cracked pipes under pure bending is considered, which is important in the leak-before-break analysis. For the analysis, scatters in the applied load, mechanical and fracture properties are considered using normal and log-normal distributions. More importantly, the applied elastic-plastic J-integral is estimated according to four different estimation methods. Resulting failure probabilities are calculated using the efficient first-order reliability method (FORM). The results show that failure probabilities can be significantly different, depending on the elastic-plastic J estimate, suggesting that absolute failure probabilities might have less significance. Based on these investigations, the accuracy of elastic-plastic defect assessment method embedded in API RP579, popularly used in petrochemical industry for integrity assessment of defective structures, is systematically investigated based on the 3-D finite element analyses. The results show that the J estimate in API RP579 can be highly inaccurate for some cases, which in turn would affect failure probabilities.

KW - First Order Reliability Method

KW - Leak-Before-Break

KW - Monte Carlo

KW - Probabilistic Fracture Mechanics

KW - Reference Stress

UR - http://www.scopus.com/inward/record.url?scp=8644230167&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=8644230167&partnerID=8YFLogxK

M3 - Article

VL - 270-273

SP - 1755

EP - 1760

JO - Key Engineering Materials

JF - Key Engineering Materials

SN - 1013-9826

IS - III

ER -