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Jamming with Tunable Roughness.

Harukuni Ikeda1, Carolina Brito2, Matthieu Wyart3

  • 1Graduate School of Arts and Sciences, The University of Tokyo Tokyo 153-8902, Japan.

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|June 6, 2020
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Summary
This summary is machine-generated.

Surface roughness significantly impacts particle jamming transitions. Rough surfaces decrease jamming density and contact numbers, mimicking frictional particle behavior and validating new theoretical models.

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Area of Science:

  • Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • The jamming transition is a critical phenomenon in granular materials and soft matter.
  • Particle shape (asphericity) influences jamming properties in smooth systems.
  • The role of surface roughness and friction in jamming remains less understood.

Purpose of the Study:

  • To introduce a novel model investigating the influence of surface roughness on the jamming transition.
  • To compare the behavior of smooth versus rough surfaces in jamming.
  • To explore the relationship between friction, isostaticity, and jamming.

Main Methods:

  • Numerical simulations of particle systems with varying surface roughness.
  • Analysis of jamming transition density and contact number.
  • Investigation of the Coulomb friction law and generalized isostaticity criteria.

Main Results:

  • For smooth surfaces, increased asphericity elevates jamming density and contact number.
  • For rough surfaces, increased asphericity decreases jamming density and contact number, matching frictional particle behavior.
  • The model satisfies a generalized isostaticity criterion in the Coulomb friction limit.

Conclusions:

  • Surface roughness fundamentally alters jamming behavior, introducing frictional effects.
  • A new theoretical framework connects surface roughness, friction, and jamming properties.
  • The study provides a method to predict contact numbers at finite friction levels.