Micromechanical constitutive modelling of granular media : evolution and loss of contact in particle clusters

Bruce Gardiner, A. Tordesillas

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Micromechanical constitutive equations are developed which allow for the broad range of interparticle interactions observed in a real deforming granular assembly: microslip contact, gross slip contact, loss of contact and an evolution in these modes of contact as the deformation proceeds. This was accomplished through a synergetic use of contact laws, which account for interparticle resistance to both sliding and rolling, together with strain-dependent anisotropies in contacts and the normal contact force. By applying the constitutive model to the bi-axial test it is demonstrated that the model can correctly predict the evolution of various anisotropies as well as the formation of a distinct shear band. Moreover, the predicted shear-band properties (e.g. thickness, prolonged localisation, void ratio) are an even better fit with experimental observations than were previously found by use of previously developed micromechanical models.
    Original languageEnglish
    Pages (from-to)93-106
    JournalJournal of Engineering Mathematics
    Volume52
    Issue number1
    DOIs
    Publication statusPublished - 2005

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