Contribution of finite element analyses to crack-like flaw assessments in a gas pipeline

Jacquemin Thibault , Mehmet E. Kartal, Gonzague Du Suau, Stéphane Hertz-Clémens

Research output: Contribution to journalArticle

2 Citations (Scopus)
3 Downloads (Pure)

Abstract

When defects reach a critical size, failure occurs in engineering components. The criticality assessment of defects is hence a key aspect of the structural integrity of gas pipelines in service. Fitness-For-Service (FFS) assessments are generally employed for evaluating the criticality of a crack-like flaw in structures using simplified assumptions in relation to geometry and material proper-ties. Whilst the errors resulting from these modelling simplifications prove acceptable in many cases, there are situations where it will be necessary to take into account the nonlinearities in geometry and/or material behaviour. This can be either to avoid excess conservatism or, on the contrary, to ensure the results are safe. In such cases it becomes essential to develop a finite element model of the structure to account for such real-engineering complexity. Welding, the most prevalent technique to join pipe, often brings about a misalignment between two pipes and hence complex crack shape is formed. The aim of this study is to develop an elasto-plastic finite element model of a gas pipeline possessing a crack in a misaligned weld. The remaining life of the pipeline is deter-mined using a Failure Assessment Diagram (FAD) and the Paris law. The results obtained from the finite element method to determine the stress intensity factors are compared to results derived using the API-579 for stress intensity factors calculations.
Original languageEnglish
Pages (from-to)41-49
Number of pages9
JournalInternational Journal of Pressure Vessels and Piping
Volume161
Early online date10 Feb 2018
DOIs
Publication statusPublished - Mar 2018

Fingerprint

Gas pipelines
Cracks
Stress intensity factors
Defects
Pipe
Geometry
Structural integrity
Application programming interfaces (API)
Welding
Welds
Pipelines
Plastics
Finite element method

Keywords

  • gas pipeline
  • hi-lo misalignment
  • crack
  • fracture
  • steel
  • API-579

Cite this

Contribution of finite element analyses to crack-like flaw assessments in a gas pipeline. / Thibault , Jacquemin; Kartal, Mehmet E.; Du Suau, Gonzague ; Hertz-Clémens, Stéphane .

In: International Journal of Pressure Vessels and Piping, Vol. 161, 03.2018, p. 41-49.

Research output: Contribution to journalArticle

Thibault , Jacquemin ; Kartal, Mehmet E. ; Du Suau, Gonzague ; Hertz-Clémens, Stéphane . / Contribution of finite element analyses to crack-like flaw assessments in a gas pipeline. In: International Journal of Pressure Vessels and Piping. 2018 ; Vol. 161. pp. 41-49.
@article{56a18fac4b0a475893a7684d2d62020e,
title = "Contribution of finite element analyses to crack-like flaw assessments in a gas pipeline",
abstract = "When defects reach a critical size, failure occurs in engineering components. The criticality assessment of defects is hence a key aspect of the structural integrity of gas pipelines in service. Fitness-For-Service (FFS) assessments are generally employed for evaluating the criticality of a crack-like flaw in structures using simplified assumptions in relation to geometry and material proper-ties. Whilst the errors resulting from these modelling simplifications prove acceptable in many cases, there are situations where it will be necessary to take into account the nonlinearities in geometry and/or material behaviour. This can be either to avoid excess conservatism or, on the contrary, to ensure the results are safe. In such cases it becomes essential to develop a finite element model of the structure to account for such real-engineering complexity. Welding, the most prevalent technique to join pipe, often brings about a misalignment between two pipes and hence complex crack shape is formed. The aim of this study is to develop an elasto-plastic finite element model of a gas pipeline possessing a crack in a misaligned weld. The remaining life of the pipeline is deter-mined using a Failure Assessment Diagram (FAD) and the Paris law. The results obtained from the finite element method to determine the stress intensity factors are compared to results derived using the API-579 for stress intensity factors calculations.",
keywords = "gas pipeline, hi-lo misalignment, crack, fracture, steel, API-579",
author = "Jacquemin Thibault and Kartal, {Mehmet E.} and {Du Suau}, Gonzague and St{\'e}phane Hertz-Cl{\'e}mens",
year = "2018",
month = "3",
doi = "10.1016/j.ijpvp.2018.02.001",
language = "English",
volume = "161",
pages = "41--49",
journal = "International Journal of Pressure Vessels and Piping",
issn = "0308-0161",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Contribution of finite element analyses to crack-like flaw assessments in a gas pipeline

AU - Thibault , Jacquemin

AU - Kartal, Mehmet E.

AU - Du Suau, Gonzague

AU - Hertz-Clémens, Stéphane

PY - 2018/3

Y1 - 2018/3

N2 - When defects reach a critical size, failure occurs in engineering components. The criticality assessment of defects is hence a key aspect of the structural integrity of gas pipelines in service. Fitness-For-Service (FFS) assessments are generally employed for evaluating the criticality of a crack-like flaw in structures using simplified assumptions in relation to geometry and material proper-ties. Whilst the errors resulting from these modelling simplifications prove acceptable in many cases, there are situations where it will be necessary to take into account the nonlinearities in geometry and/or material behaviour. This can be either to avoid excess conservatism or, on the contrary, to ensure the results are safe. In such cases it becomes essential to develop a finite element model of the structure to account for such real-engineering complexity. Welding, the most prevalent technique to join pipe, often brings about a misalignment between two pipes and hence complex crack shape is formed. The aim of this study is to develop an elasto-plastic finite element model of a gas pipeline possessing a crack in a misaligned weld. The remaining life of the pipeline is deter-mined using a Failure Assessment Diagram (FAD) and the Paris law. The results obtained from the finite element method to determine the stress intensity factors are compared to results derived using the API-579 for stress intensity factors calculations.

AB - When defects reach a critical size, failure occurs in engineering components. The criticality assessment of defects is hence a key aspect of the structural integrity of gas pipelines in service. Fitness-For-Service (FFS) assessments are generally employed for evaluating the criticality of a crack-like flaw in structures using simplified assumptions in relation to geometry and material proper-ties. Whilst the errors resulting from these modelling simplifications prove acceptable in many cases, there are situations where it will be necessary to take into account the nonlinearities in geometry and/or material behaviour. This can be either to avoid excess conservatism or, on the contrary, to ensure the results are safe. In such cases it becomes essential to develop a finite element model of the structure to account for such real-engineering complexity. Welding, the most prevalent technique to join pipe, often brings about a misalignment between two pipes and hence complex crack shape is formed. The aim of this study is to develop an elasto-plastic finite element model of a gas pipeline possessing a crack in a misaligned weld. The remaining life of the pipeline is deter-mined using a Failure Assessment Diagram (FAD) and the Paris law. The results obtained from the finite element method to determine the stress intensity factors are compared to results derived using the API-579 for stress intensity factors calculations.

KW - gas pipeline

KW - hi-lo misalignment

KW - crack

KW - fracture

KW - steel

KW - API-579

U2 - 10.1016/j.ijpvp.2018.02.001

DO - 10.1016/j.ijpvp.2018.02.001

M3 - Article

VL - 161

SP - 41

EP - 49

JO - International Journal of Pressure Vessels and Piping

JF - International Journal of Pressure Vessels and Piping

SN - 0308-0161

ER -