Residual stress effects of a fatigue crack on guided lamb waves

M. Martinez, S Pant, M Yanishevsky, D Backman

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
22 Downloads (Pure)

Abstract

Structural health monitoring has focused on the use of computational models to capture the effect of crack-like discontinuities on the behaviour of acoustic-ultrasonic signals. However, few models have taken into account the effect of geometric complexity in combination with residual stresses generated during the fatigue crack growth (FCG) process. In this study, a finite element analysis model of a C-channel type aeronautical structure is evaluated under a pitch-catch scenario. Three different finite element model configurations were considered in order to understand the effects that residual stresses of a fatigue crack emanating from a through-hole have on the guided Lamb wave propagation behaviour. The results demonstrate that numerical modelling is able to capture the change in amplitude and the effect of a phase shift on the guided Lamb wave behaviour due to the presence of the discontinuity and the stress field generated during the FCG process.

Original languageEnglish
Article number115004
Number of pages24
JournalSmart Materials and Structures
Volume26
Issue number11
DOIs
Publication statusPublished - 29 Sep 2017

Keywords

  • acoustic-ultrasonic
  • complex structures
  • fatigue crack growth
  • guided lamb wave
  • propagation
  • residual stress field
  • structural health monitoring

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