Fatigue strength modelling of high-performance welds using local approaches

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Abstract

This paper investigates the effect of weld geometry on the fatigue strength of butt joints. The influence of weld notch shape and weld flank angle is studied with finite element analysis and three different local approaches. The applied approaches are notch stress approach, linear elastic-fracture mechanics (LEFM), and recently published strain-based crack growth approach. In this strain-based approach, the fatigue damage process is modelled as a sequence of repeated crack initiation processes. This enables to consider the influence of short crack initiation and growth. The numerical simulations are compared to fatigue test results. The study reveals that for high-performance welds with favorable notch geometry, the macro crack initiation period becomes significant causing inaccuracies with notch stress approach and LEFM. For a normal-quality weld with the undercut depth of 0.1 mm, the macro crack propagation dominates the total fatigue life. In this case, all approaches show somewhat similar estimation on the fatigue strength.

Details

Original languageEnglish
Title of host publicationProceedings of the 13th International Symposium on PRActical Design of Ships and Other Floating Structures (PRADS' 2016)
Publication statusPublished - 2016
MoE publication typeA4 Article in a conference publication
EventInternational Symposium on Practical Design of Ships and Other Floating Structures - Crowne Plaza Copenhagen Towers, Copenhagen, Denmark
Duration: 4 Sep 20168 Sep 2016
Conference number: 13
http://www.prads2016.dk/

Conference

ConferenceInternational Symposium on Practical Design of Ships and Other Floating Structures
Abbreviated titlePRADS
CountryDenmark
CityCopenhagen
Period04/09/201608/09/2016
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    Research areas

  • fatigue strenght, flank angle, linar elastic fracture mechanics, notch stress approach, strain-based crack growth approach, undercut

ID: 9591574