Strain-based approach to fatigue crack initiation on high-strength-steel welded joints under multiaxial loading

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Researchers

Research units

  • École Polytechnique Fédérale de Lausanne (EPFL)

Abstract

A recently novel strain-based approach recently proposed by Remes (Remes 2013) for the fatigue strength modelling of welded steel joints is extended here to consider multiaxial loading conditions and three dimensions finite element models. Only the first step of the approach to initiate a crack is presented in this paper. The multiaxial fatigue number of cycles to initiate a crack of full-scale tube-to-plate specimens in S690QL steel is assessed and compared to experimental results. As fatigue cracks are initiating at the weld toe, the statistical distributions of the main geometrical parameters of the weld are defined by the mean of 3D laser scans and used to perform parametrical analyses. In addition, variations in the material characteristics due to the welding process, i.e. in the heat affected zone and the base material, are considered. Effects of the residual stresses are also considered. Results of the parametrical analyses and comparisons with the experiments are presented and discussed.

Details

Original languageEnglish
Title of host publicationADVANCES IN ENGINEERING MATERIALS, STRUCTURES AND SYSTEMS: INNOVATIONS, MECHANICS AND APPLICATIONS
EditorsA Zingoni
Publication statusPublished - 22 Aug 2019
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Structural Engineering, Mechanics and Computation - Cape Town, South Africa
Duration: 2 Sep 20194 Sep 2019
Conference number: 7

Conference

ConferenceInternational Conference on Structural Engineering, Mechanics and Computation
Abbreviated titleSEMC
CountrySouth Africa
CityCape Town
Period02/09/201904/09/2019

    Research areas

  • PROPAGATION

ID: 40314762