Elastic strains around cracked cold-expanded fastener holes measured using the synchrotron X-ray diffraction technique

D. Stefanescu, A. Steuwer, R. A. Owen, B. Nadri, L. Edwards, M. E. Fitzpatrick, P. J. Withers

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In this work, the capability of the synchrotron X-ray diffraction technique to measure changes in the residual strains caused by fatigue crack growth from cold-expanded holes in an aluminium alloy plate has been investigated. The measurement technique was validated by comparing the synchrotron measurements around uncracked holes with those obtained on similar specimens using the neutron diffraction and Sachs' techniques. Measurements were performed with and without superimposed tensile mechanical loading and the results compared with analytical results. The improved spatial resolution of the synchrotron technique relative to the other methods has allowed the strain fields around a fatigue crack growing from a cold-expanded hole to be evaluated in the unloaded state and at two loading levels. Only at the higher load does the crack appear to open along its full length.
    Original languageEnglish
    Pages (from-to)459-469
    Number of pages10
    JournalJournal of Strain Analysis For Engineering Design
    Volume39
    Issue number5
    DOIs
    Publication statusPublished - Sep 2004

    Keywords

    • Cold-expanded hole
    • Fatigue cracking
    • Residual strain
    • Synchrotron X-ray diffraction

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