J-Integral Calculation by Finite Element Processing of Measured Full-Field Surface Displacements

S. M. Barhli, Mahmoud Mostafavi, Ahmet Cinar, David Hollis, James Marrow

Research output: Contribution to journalArticle (Academic Journal)peer-review

34 Citations (Scopus)
538 Downloads (Pure)

Abstract

A novel method has been developed based on the conjoint use of digital image correlation to measure full field displacements and finite element simulations to extract the strain energy release rate of surface cracks. In this approach, a finite element model with imported full-field displacements measured by DIC is solved and the J-integral is calculated, without knowledge of the specimen geometry and applied loads. This can be done even in a specimen that develops crack tip plasticity, if the elastic and yield behaviour of the material are known. The application of the method is demonstrated in an analysis of a fatigue crack, introduced to an aluminium alloy compact tension specimen (Al 2024, T351 heat condition).
Original languageEnglish
Pages (from-to)997-1009
Number of pages13
JournalExperimental Mechanics
Volume57
Issue number6
Early online date10 Apr 2017
DOIs
Publication statusPublished - Jul 2017

Keywords

  • J-integral
  • Digital image correlation
  • Finite element analysis
  • Stress-intensity factor

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