Some experimental observations on crack closure and crack-tip plasticity

P Lopez-Crespo, A Shterenlikht, JR Yates, EA Patterson, PJ Withers

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

52 Citations (Scopus)


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.
Translated title of the contributionSome experimental observations on crack closure and crack-tip plasticity
Original languageEnglish
Pages (from-to)418 - 429
Number of pages12
JournalFatigue and Fracture of Engineering Materials and Structures
Issue number5
Publication statusPublished - May 2009

Bibliographical note

Publisher: Wiley (formerly Blackwell)


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