The stress intensity of mixed mode cracks determined by digital image correlation

Pablo Lopez-Crespo, Anton Shterenlikht, Eann Patterson, John Yates, Philip Withers

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

123 Citations (Scopus)


A generalized approach for determining the stress intensity factors (SIFs) K(I) and K(II) for any mode mixity directly from displacement fields obtained by digital image correlation is presented using a centre fatigue cracked aluminium plate as an example problem. It was found that the crack-tip position could be determined on average to within 50 per cent of the displacement vector spacing (60 mu m). The approach has been shown to be fairly robust, both in terms of the stability of the SIFs thus obtained and their sensitivity (less than 0.07 MPa root m) to the above uncertainty in the crack-tip location. Differences between the nominal and experimentally determined K(I) and K(II) values were found to be comparable (around 1.0 MPa root m) for values of K(I) ranging from 0 to 15 MPa root m and K(II) from 15 to 0 MPa root m, and may have arisen because the nominal values are not representative of those acting at the real crack tip.
Original languageEnglish
Article numberOI: 10.1243/03093247JSA419
Pages (from-to)769-780
Number of pages12
JournalJournal of Strain Analysis for Engineering Design
Issue number8
Publication statusPublished - 2008


  • stress intensity factors; mixed mode cracks; digital image correlation


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