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Related Experiment Videos

Multiscaling at Point J: jamming is a critical phenomenon.

J A Drocco1, M B Hastings, C J Olson Reichhardt

  • 1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46656, USA.

Physical Review Letters
|October 4, 2005
PubMed
Summary

Researchers studied the jamming transition in disordered disk assemblies. Increasing packing density reveals a second-order phase transition, evidenced by power-law divergences and multiscaling in velocity fluctuations.

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Area of Science:

  • Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • The jamming transition describes the transition of granular materials from a flowing to a rigid state.
  • Understanding this transition is crucial for predicting material behavior under stress.
  • The jamming phase diagram provides a framework for studying these transitions under various conditions.

Purpose of the Study:

  • To investigate the jamming transition at zero temperature (T=0) as a function of increasing packing density.
  • To identify the order of the phase transition at "Point J" of the jamming phase diagram.
  • To explore the nature of velocity fluctuations near the critical jamming density.

Main Methods:

  • Analysis of a disordered two-dimensional assembly of disks.

Related Experiment Videos

  • Measurement of the total number of moving disks.
  • Quantification of the transverse length of the moving region.

    • Main Results:

    • Observed a power-law divergence in the number of moving disks and transverse moving region length as packing density increased.
    • Found evidence supporting a second-order phase transition at the critical jamming density.
    • Detected multiscaling behavior in velocity fluctuations, suggesting the presence of long tails.

    Conclusions:

    • The T=0 jamming transition driven by packing density is a second-order phase transition.
    • Multiscaling behavior highlights the significance of long-tailed velocity fluctuations near jamming.
    • These findings contribute to a deeper understanding of the physics of jamming in disordered systems.