Measurement of stress intensity factors by digital camera

S. H. Ju, S. H. Liu, K. W. Liu

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


This paper developed a least-squares method to evaluate the mixed-mode stress intensity factors (SIFs) of the isotropic material using the computer images from the digital-camera experiment. This experiment measures the crack opening displacement (COD) and then evaluates SIFs by using the least-squares method. The attractions of this method include: (1) specimen preparation and experiment procedures are not complicated and (2) the isolation of the micro-vibration is not necessary in the experiment. Both finite element simulations and laboratory experiments were applied to validate the current least-squares method with acceptable accuracy, if the even terms of the Irwin's equation are removed.

Original languageEnglish
Pages (from-to)1009-1022
Number of pages14
JournalInternational Journal of Solids and Structures
Issue number5
Publication statusPublished - 2006 Mar

All Science Journal Classification (ASJC) codes

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


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