A parametric study on creep-fatigue strength of welded joints using the linear matching method

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Abstract

This paper presents a parametric study on creep-fatigue strength of the steel AISI type 316N(L) weldments of types 1 and 2 according to R5 Vol. 2/3 Procedure classification at 550◦C. The study is implemented using the Linear Matching Method (LMM) and is based upon a latest developed creep-fatigue evaluation procedure considering time fraction rule for creep-damage assessment. Parametric models of geometry and FE-meshes for both types of weldments are developed in this way, which allows variation of parameters governing shape of the weld profile and loading conditions. Five configurations, characterised by individual sets of parameters, and presenting different fabrication cases, are proposed. For each configuration, the total number of cycles to failure N⋆ in creep-fatigue conditions is assessed numerically for different loading cases including normalised bending moment M and dwell period t. The obtained set of N⋆ is extrapolated by the analytic function, which is dependent on M, t and geometrical parameters (α and β). Proposed function for N⋆ shows good agreement with numerical results obtained by the LMM. Thus, it is used for the identification of Fatigue Strength Reduction Factors (FSRFs) intended for design purposes and dependent on t, α, β.
LanguageEnglish
Pages112-125
Number of pages14
JournalInternational Journal of Fatigue
Volume55
DOIs
Publication statusPublished - Oct 2013

Fingerprint

Welded Joints
Fatigue Strength
Creep
Welds
Fatigue
Fatigue of materials
Damage Assessment
Configuration
Dependent
Steel
Bending moments
Parametric Model
Analytic function
Fabrication
Mesh
Moment
Cycle
Numerical Results
Geometry
Fatigue strength

Keywords

  • creep
  • parametric study
  • weldment
  • damage
  • finite element analysis
  • FSRF
  • low-cycle fatigue
  • creep-fatigue strength
  • welded joints
  • linear matching method

Cite this

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title = "A parametric study on creep-fatigue strength of welded joints using the linear matching method",
abstract = "This paper presents a parametric study on creep-fatigue strength of the steel AISI type 316N(L) weldments of types 1 and 2 according to R5 Vol. 2/3 Procedure classification at 550◦C. The study is implemented using the Linear Matching Method (LMM) and is based upon a latest developed creep-fatigue evaluation procedure considering time fraction rule for creep-damage assessment. Parametric models of geometry and FE-meshes for both types of weldments are developed in this way, which allows variation of parameters governing shape of the weld profile and loading conditions. Five configurations, characterised by individual sets of parameters, and presenting different fabrication cases, are proposed. For each configuration, the total number of cycles to failure N⋆ in creep-fatigue conditions is assessed numerically for different loading cases including normalised bending moment M and dwell period t. The obtained set of N⋆ is extrapolated by the analytic function, which is dependent on M, t and geometrical parameters (α and β). Proposed function for N⋆ shows good agreement with numerical results obtained by the LMM. Thus, it is used for the identification of Fatigue Strength Reduction Factors (FSRFs) intended for design purposes and dependent on t, α, β.",
keywords = "creep, parametric study, weldment, damage, finite element analysis, FSRF, low-cycle fatigue, creep-fatigue strength, welded joints, linear matching method",
author = "Yevgen Gorash and Haofeng Chen",
year = "2013",
month = "10",
doi = "10.1016/j.ijfatigue.2013.06.011",
language = "English",
volume = "55",
pages = "112--125",
journal = "International Journal of Fatigue",
issn = "0142-1123",

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T1 - A parametric study on creep-fatigue strength of welded joints using the linear matching method

AU - Gorash, Yevgen

AU - Chen, Haofeng

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N2 - This paper presents a parametric study on creep-fatigue strength of the steel AISI type 316N(L) weldments of types 1 and 2 according to R5 Vol. 2/3 Procedure classification at 550◦C. The study is implemented using the Linear Matching Method (LMM) and is based upon a latest developed creep-fatigue evaluation procedure considering time fraction rule for creep-damage assessment. Parametric models of geometry and FE-meshes for both types of weldments are developed in this way, which allows variation of parameters governing shape of the weld profile and loading conditions. Five configurations, characterised by individual sets of parameters, and presenting different fabrication cases, are proposed. For each configuration, the total number of cycles to failure N⋆ in creep-fatigue conditions is assessed numerically for different loading cases including normalised bending moment M and dwell period t. The obtained set of N⋆ is extrapolated by the analytic function, which is dependent on M, t and geometrical parameters (α and β). Proposed function for N⋆ shows good agreement with numerical results obtained by the LMM. Thus, it is used for the identification of Fatigue Strength Reduction Factors (FSRFs) intended for design purposes and dependent on t, α, β.

AB - This paper presents a parametric study on creep-fatigue strength of the steel AISI type 316N(L) weldments of types 1 and 2 according to R5 Vol. 2/3 Procedure classification at 550◦C. The study is implemented using the Linear Matching Method (LMM) and is based upon a latest developed creep-fatigue evaluation procedure considering time fraction rule for creep-damage assessment. Parametric models of geometry and FE-meshes for both types of weldments are developed in this way, which allows variation of parameters governing shape of the weld profile and loading conditions. Five configurations, characterised by individual sets of parameters, and presenting different fabrication cases, are proposed. For each configuration, the total number of cycles to failure N⋆ in creep-fatigue conditions is assessed numerically for different loading cases including normalised bending moment M and dwell period t. The obtained set of N⋆ is extrapolated by the analytic function, which is dependent on M, t and geometrical parameters (α and β). Proposed function for N⋆ shows good agreement with numerical results obtained by the LMM. Thus, it is used for the identification of Fatigue Strength Reduction Factors (FSRFs) intended for design purposes and dependent on t, α, β.

KW - creep

KW - parametric study

KW - weldment

KW - damage

KW - finite element analysis

KW - FSRF

KW - low-cycle fatigue

KW - creep-fatigue strength

KW - welded joints

KW - linear matching method

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T2 - International Journal of Fatigue

JF - International Journal of Fatigue

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