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Related Experiment Videos

Jamming and fluctuations in granular drag

Albert1, Tegzes, Kahng

  • 1Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA.

Physical Review Letters
|September 16, 2000
PubMed
Summary

Granular media jamming dynamics reveal stick-slip behavior originating from bulk stress, not surface interactions. Fluctuations transition from periodic to stepped with depth, indicating long-range force chain effects.

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Area of Science:

  • Physics
  • Materials Science
  • Geophysics

Background:

  • Granular materials exhibit complex behaviors, including jamming and unjamming transitions.
  • Understanding the dynamics of these transitions is crucial for various applications, from engineering to geology.
  • The role of internal stress and force chains in granular jamming remains an active area of research.

Purpose of the Study:

  • To investigate the dynamic evolution of jamming in granular media.
  • To analyze the nature of fluctuations in granular drag force during jamming.
  • To elucidate the origins and depth-dependent characteristics of jamming phenomena.

Main Methods:

  • Monitoring fluctuations in granular drag force.
  • Analyzing the stick-slip nature of these fluctuations.

Related Experiment Videos

  • Observing changes in fluctuation patterns at different depths within the granular sample.

    • Main Results:

    • Jamming evolution exhibits stick-slip behavior due to successive collapse and formation of jammed states.
    • The observed fluctuations are independent of the contact surface, suggesting bulk nucleation of stress-induced collapse.
    • Fluctuations transition from periodic at small depths to stepped at large depths.

    Conclusions:

    • Stress-induced collapse in granular media is nucleated in the bulk.
    • The transition in fluctuation patterns with depth is attributed to the long-range nature of force chains.
    • This study provides insights into the fundamental mechanics of jamming in granular systems.