Observations of stresses and strains in a granular material

D. Lesniewska, David Muir Wood

    Research output: Contribution to journalArticlepeer-review

    48 Citations (Scopus)


    The use of glass ballotini as a granular material provides the opportunity to simultaneously study internal stress fields and internal fields of deformation as a sample is submitted to boundary perturbations. Digital image correlation makes use of the visible fabric of the material to deduce a field of displacements from one digital photographic image to the next. If the glass granules are immersed in a fluid having the same refractive index, then observation with polarized light exploits the photoelastic properties of the glass to reveal information about the stresses. Again, comparison of digital photographs enables changes in stress conditions from one image to the next to be discovered. Tests performed in a simple loading device which forces rotation of principal axes in parts of the granular mass are presented to demonstrate the unique potential of this dual experimental configuration.
    Original languageEnglish
    Pages (from-to)1038-1054
    Number of pages17
    JournalJournal of Engineering Mechanics
    Issue number9
    Publication statusPublished - 1 Jan 2009


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