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On intermittency in sheared granular systems.

Miroslav Kramár1, Chao Cheng2, Rituparna Basak2

  • 1Department of Mathematics, University of Oklahoma, 601 Elm Avenue, Norman, OK 73019, USA. miro@ou.edu.

Soft Matter
|April 27, 2022
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Summary
This summary is machine-generated.

Researchers studied granular materials under shear stress, finding that micro-scale fluctuations, not global averages, predict impending slip events. This reveals critical precursory signals in granular dynamics.

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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Granular materials exhibit complex behaviors under external stress.
  • Understanding precursory signals for failure events is crucial in materials science.

Purpose of the Study:

  • To identify predictive measures of slip events in 2D frictional soft elastic disks under shear stress.
  • To differentiate between global and micro/mesoscale system behaviors preceding slip.

Main Methods:

  • Simulating a 2D system of frictional soft elastic disks in a planar Couette geometry.
  • Applying time-dependent shear stress to induce stick-slip dynamics.
  • Analyzing global system averages (e.g., forces, contacts) and time-dependent micro/mesoscale measures (e.g., Wasserstein distance, broken contacts).

Main Results:

  • Global measures (e.g., average forces, number of contacts) showed little sensitivity to approaching slip events.
  • Time-dependent micro/mesoscale measures, such as Wasserstein distance and broken contacts, increased dramatically before slip.
  • This indicates significant system fluctuations preceding slip events.

Conclusions:

  • Micro/mesoscale temporal evolution measures are effective predictors of impending slip events in granular systems.
  • Global averages are insufficient for predicting critical transitions like slip events.
  • The findings highlight the importance of analyzing dynamic, localized changes in granular materials.