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Force Distributions near Jamming and Glass Transitions.

O'Hern1, Langer, Liu

  • 1Department of Chemistry and Biochemistry, University of California at Los Angeles, Los Angeles, California 90095-1569 and James Franck Institute, The University of Chicago, Chicago, Illinois 60637.

Physical Review Letters
|January 3, 2001
PubMed
Summary
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Researchers studied interparticle forces near glass and jamming transitions. A force peak indicates yield stress, sensitive to temperature, shear stress, and density, supporting a generalized jamming phase diagram.

Area of Science:

  • Soft matter physics
  • Statistical mechanics

Background:

  • Supercooled liquids and foams exhibit complex behaviors near phase transitions.
  • Understanding interparticle forces is crucial for characterizing these states.

Purpose of the Study:

  • To calculate the distribution of interparticle normal forces P(F) near glass and jamming transitions.
  • To investigate the relationship between P(F) and macroscopic properties like yield stress.
  • To evaluate the validity of a generalized jamming phase diagram.

Main Methods:

  • Computational modeling of supercooled liquids and foams.
  • Analysis of interparticle normal force distributions P(F).

Main Results:

  • P(F) develops a peak near glass and jamming transitions.

Related Experiment Videos

  • The peak's height correlates with decreasing temperature, decreasing shear stress, and increasing packing density.
  • Observed P(F) shape is consistent with experimental data from granular packings.

    • Conclusions:

    • The emergence of the P(F) peak signals the development of a yield stress.
    • The peak's sensitivity to external parameters supports the generalized jamming phase diagram.