Jamming by shear in a dilating granular system

ORAL

Abstract

Jamming can occur in frictional granular materials undergoing shear at a fixed packing fraction, φ, for φ within a range of packing fractions below the isotropic jamming point, and the amount of strain required to induce jamming, γ, increases with decreasing φ. We are interested in how the shear jamming process is affected if the system is dilating as it is sheared. We conduct experiments to shear a 2D granular system while continuously increasing the system volume. Below a certain dilation rate, the system is still able to jam at packing fraction, φc, smaller than the initial φ. We measure γ for different dilation rates and initial packing fractions by monitoring the coordination number of non-rattlers and the system pressure. We find that γ is the same as the γ required to jam a system with fixed packing fraction φc via pure shear.

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Presenters

  • Meimei Wang

    Civil Engineering, University of Science and Technology Beijing

Authors

  • Meimei Wang

    Civil Engineering, University of Science and Technology Beijing

  • Dong Wang

    Duke University, Physics Department, Duke University

  • Joshua Socolar

    Department of Physics, Duke University, Durham, NC, USA, Physics Department, Duke University, Physics, Duke University, Duke University

  • Hu Zheng

    Physics, Duke University, Duke University, Duke University/Hohai University, Physics Department, Duke University

  • Robert P Behringer

    Department of Physics, Duke University, Durham, NC, USA, Physics, Duke University, Duke University, Physics Department, Duke University