Investigation of crack growth in functionally graded materials using digital image correlation

Jorge Abanto-Bueno, John Lambros

Research output: Contribution to journalArticlepeer-review


The crack growth resistance behavior of functionally graded materials (FGMs) was investigated using the full-field measurement technique of digital image correlation (DIC). Model FGMs were manufactured using ultraviolet irradiation of a photosensitive polyethylene co-polymer. Edge crack FGM fracture specimens were loaded such that stable quasi-static growth occurred. A DIC code, generated and tested in-house, was used to obtain the in-plane displacement field surrounding the propagating crack. The results were then used to extract stress intensity factors and generate resistance curves for the FGM. A crack growth resistance behavior of continually increasing toughness with crack extension was observed. The full-field optical technique also allowed for the investigation of regions of K- dominance in the FGM (i.e. areas where the theoretical asymptotic fields well describe the near tip deformation). The results were compared to stress intensity factor values obtained using crack face profile shape measurements and good agreement was found.

Original languageEnglish (US)
Pages (from-to)1695-1711
Number of pages17
JournalEngineering Fracture Mechanics
Issue number14-16
StatePublished - Sep 2002


  • Crack growth
  • Digital image correlation
  • Functionally graded materials
  • R-curve

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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