Experimental and modelling study of fatigue crack initiation in an aluminium beam with a hole under 4-point bending

Wenye Ye, Panos Efthymiadis, Christophe Pinna, Anxin Ma, Barbara Shollock, Richard Dashwood

Research output: Contribution to journalArticle

6 Citations (Scopus)
57 Downloads (Pure)

Abstract

Slip band formation and crack initiation during cyclic fatigue were investigated by in-situ experiments and non-local CPFEM simulations systematically. Experimental techniques including EBSD, digital image correlation (DIC) and SEM have been used to obtain consistent grain orientations, local strains, as well as the locations where slip bands and micro-cracks form on the sample surface. The realistic microstructure based on the EBSD map has been generated and used for finite element modelling. An advanced non-local crystal plasticity model, which considers the isotropic and kinematic hardening of the plastic strain gradient, has been adopted. The simulation results match well the corresponding experimental results. It was found that total strain and averaged slip on all slip systems, combined with accumulated slip on specific slip planes help predict the location and orientation of slip bands and micro-crack initiation correctly. Furthermore, a fatigue indicating parameter based on competition between maximum slip and the total slip has been proposed to reproduce the experimental observations.

Original languageEnglish
Pages (from-to)87-96
Number of pages10
JournalInternational Journal of Solids and Structures
Volume138
Early online date10 Jan 2018
DOIs
Publication statusPublished - 1 May 2018

Bibliographical note

This is an open access article under the CC BY license. (http://creativecommons.org/licenses/by/4.0/)

Keywords

  • 4-points bending test
  • A. crack initiation
  • A. slip band
  • B. crystal plasticity
  • Fatigue indicating parameter

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Applied Mathematics

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