Sheared Amorphous Packings Display Two Separate Particle Transport Mechanisms

Dong Wang, Joshua A. Dijksman, Jonathan Barés, Jie Ren, and Hu Zheng
Phys. Rev. Lett. 125, 138001 – Published 24 September 2020
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Abstract

Shearing granular materials induces nonaffine displacements. Such nonaffine displacements have been studied extensively, and are known to correlate with plasticity and other mechanical features of amorphous packings. A well known example is shear transformation zones as captured by the local deviation from affine deformation, Dmin2, and their relevance to failure and stress fluctuations. We analyze sheared frictional athermal disc packings and show that there exists at least one additional mesoscopic transport mechanism that superimposes itself on top of local diffusive motion. We evidence this second transport mechanism in a homogeneous system via a diffusion tensor analysis and show that the trace of the diffusion tensor equals the classic Dmin2 when this second mesoscopic transport is corrected for. The new transport mechanism is consistently observed over a wide range of volume fractions and even for particles with different friction coefficients and is consistently observed also upon shear reversal, hinting at its relevance for memory effects.

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  • Received 23 December 2019
  • Revised 12 July 2020
  • Accepted 9 September 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.138001

© 2020 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft MatterFluid DynamicsNonlinear Dynamics

Authors & Affiliations

Dong Wang1,*, Joshua A. Dijksman2,*, Jonathan Barés3, Jie Ren4, and Hu Zheng1,5,†

  • 1Department of Physics and Center for Non-linear and Complex Systems, Duke University, Durham, North Carolina 27708, USA
  • 2Physical Chemistry and Soft Matter, Wageningen University and Research, Stippeneng 4, 6708 WE Wageningen, Netherlands
  • 3LMGC, UMR 5508 CNRS-University Montpellier, 34095 Montpellier, France
  • 4Merck & Company, Incorporated, West Point, Pennsylvania 19486, USA
  • 5Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China

  • *These authors contributed equally.
  • zhenghu@tongji.edu.cn

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Issue

Vol. 125, Iss. 13 — 25 September 2020

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