Shear jamming in packings of frictional disks

Invited

Abstract


The mechanical properties of geotechnical structures depend on the history that generated them. Examples include riverbed hardening and delta formation. Similar history or protocol dependence also occurs on the particle scale. For example, the seminal experiments by D. Bi, et al. in Nature 480 (2011) 355, showed that simple and pure shear can generate jammed packings of thin cylinders whose properties are different from those generated via isotropic compression. In our recent computational studies, we showed that for frictionless disks, shear- and isotropically jammed packings possess the same packing fraction. However, shear-jammed packings possess nonzero stress anisotropy, whereas isotropically jammed packings possess zero anisotropy in the large-system limit. Here, we describe discrete element modeling simulations to prepare jammed packings of frictional disks via isotropic compression and simple shear. We compare the contact number and packing fraction at jamming onset versus the friction coefficient for packings generated via isotropic compression and simple shear. We also address whether the ensemble of jammed packings generated via simple shear and that generated via isotropic compression are the same.

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Presenters

  • Mark Shattuck

    Benjamin Levich Institute and Physics Department, The City College of the City University of New York, Department of Physics and Benjamin Levich Institute, The City College of the City, University of New York, City College of New York, Department of Mechanical Engineering & Materials Science, City College New York, Physics, The City College of the City University of New York, The City College of New York

Authors

  • Mark Shattuck

    Benjamin Levich Institute and Physics Department, The City College of the City University of New York, Department of Physics and Benjamin Levich Institute, The City College of the City, University of New York, City College of New York, Department of Mechanical Engineering & Materials Science, City College New York, Physics, The City College of the City University of New York, The City College of New York

  • Fansheng Xiong

    Yale University

  • Philip Wang

    Yale University

  • Abe Clark

    Naval Postgraduate School, Physics, Naval Postgraduate School

  • Nicholas Ouellette

    Civil and Environmental Engineering, Stanford University, Stanford University

  • Corey Shane O'Hern

    Yale Univ, Department of Mechanical Engineering & Materials Science, Yale University, Department of Mechanical Engineering and Materials Science, Yale University, Mechanical Engineering and Materials Science, Yale University, Mechanical Engineering & Material Science, Physics, and Applied Physics, Yale University, Yale University