Near tip strain evolution of a growing fatigue crack

M. L. Zhu, Y. W. Lu, C. Lupton, J. Tong

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    Near tip full-field strains in a growing fatigue crack have been studied in situ using the Digital Image Correlation (DIC) technique in a compact tension specimen of stainless steel 316L under tension-tension cyclic loading. An error analysis of displacements and strains has been carried out, and the results show that the precision of displacements and strains in the wake of the crack is worse than that in front of the crack. A method for the determination of crack tip location is proposed for the DIC analysis. Strain ratchetting is observed ahead of the growing fatigue crack tip and found to be dependent on the distance to the crack tip; whilst normal strains appear to stabilise behind the crack tip.

    Original languageEnglish
    Pages (from-to)67-72
    Number of pages6
    JournalFrattura ed Integrita Strutturale
    Issue number33
    Publication statusPublished - Jul 2015


    • Crack tip
    • DIC
    • Error analysis
    • Fatigue crack growth
    • Strain ratchetting


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