Some experimental observations on crack closure and crack-tip plasticity

P. Lopez-Crespo, A. Shterenlikht, J. R. Yates, E. A. Patterson, P. J. Withers

    Research output: Contribution to journalArticlepeer-review


    This study presents a methodology for evaluating crack closure and the effect of crack-tip plasticity on stress intensity. Full-field displacement maps obtained by digital image correlation are used to obtain the mixed-mode, crack-driving force. The methodology allows the quantification of the effect of a range of contact phenomena: effects arising from interlocking, plastic deformation of crack face asperities and wedging generated as a consequence of sliding displacements of fatigue cracks have been identified. By evaluating the effective crack-tip stress intensity factor, crack opening levels can be quantified for both mode I and mode II. Moreover, the approach can take into account plasticity effects local to the crack in determining the stress intensity factor. All the information can be extracted in a non-contacting fashion with equipment that can be easily incorporated into industrial environments. © 2009 Blackwell Publishing.
    Original languageEnglish
    Pages (from-to)418-429
    Number of pages11
    JournalFatigue and Fracture of Engineering Materials and Structures
    Issue number5
    Publication statusPublished - 2009


    • Digital image correlation
    • Effective stress intensity factor
    • Fatigue crack closure
    • Plastic zone


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