A parametric study on creep-fatigue endurance of welded joints

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Abstract

This work is devoted to parametric study on creep-fatigue endurance of the steel AISI type 316N(L) weldments defined as type 3 according to R5 Vol. 2/3 procedure at 550◦C. The study is implemented using a novel direct method known as the Linear Matching Method (LMM) and based upon the creep-fatigue evaluation procedure considering time fraction rule for creep-damage assessment. Seven geometrical configurations of the weldment, which are characterised by individual values of a geometrical parameter p, are proposed. Parameter p, which represents different grades of TIG dressing, is a ratio between the radius of the fillet of the remelted metal on a weld toe and the thickness of welded plates. 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 At. The obtained set of N⋆ is extrapolated by the analytic function dependent on ˜M , At and p. Proposed function for N⋆ shows good agreement with numerical results obtained by the LMM. It is used for the identification of Fatigue Strength Reduction Factors (FSRFs) effected by creep and dependent on At and p.
Original languageEnglish
Pages (from-to)73-74
Number of pages2
JournalProceedings in Applied Mathematics and Mechanics, PAMM
Volume13
Issue number1
Early online date29 Nov 2013
DOIs
Publication statusPublished - Dec 2013
Event84th Annual Meeting of the International Association of Applied Mathematics and Mechanics 2013 - Novi Sad, Serbia
Duration: 18 Mar 201322 Mar 2013

Keywords

  • parametric study
  • creep-fatigue strength
  • welded joints

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