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Related Experiment Videos

Stick-slip fluctuations in granular drag.

I Albert1, P Tegzes, R Albert

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 3, 2001
PubMed
Summary

Object drag in granular media shows stick-slip motion due to jamming. Force fluctuations are independent of surface properties, indicating bulk granular material properties govern drag.

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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Understanding granular materials is crucial in various fields, from geology to manufacturing.
  • Drag force in granular media is complex, influenced by particle interactions and jamming phenomena.

Purpose of the Study:

  • To investigate the nature of drag force fluctuations experienced by an object moving through a granular medium.
  • To analyze the transition in fluctuation patterns at different depths and their relation to force chains.
  • To determine the influence of contact surface properties on drag force and its fluctuations.

Main Methods:

  • Experimental setup involving an object dragged through a granular medium at varying depths.
  • Analysis of drag force fluctuations, identifying stick-slip behavior and pattern transitions.

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  • Comparison of results across different granular materials and contact surface properties.

    • Main Results:

    • Drag force exhibits a stick-slip behavior due to the formation and collapse of jammed states.
    • Fluctuation patterns transition from periodic at small depths to "stepped" at large depths.
    • Mean force and fluctuations are independent of the contact surface properties, suggesting bulk origin.

    Conclusions:

    • The drag force in granular media is primarily governed by bulk properties, not surface interactions.
    • Force chain networks and experimental size influence the observed drag force dynamics.
    • The study provides insights into the fundamental mechanics of granular material flow and resistance.