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Three-dimensional mapping of dislocation avalanches: clustering and space/time coupling.

Jérôme Weiss1, David Marsan

  • 1Laboratoire de Glaciologie et Géophysique de l'Environnement-CNRS, 54 rue Molière, BP 96, 38402 St. Martin d'Hères Cedex, France.

Science (New York, N.Y.)
|January 4, 2003
PubMed
Summary

Dislocation avalanches in deforming ice exhibit fractal clustering and space-time coupling. This suggests self-organization in plastic flow, revealing complex material behavior under stress.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Geophysics

Background:

  • Plastic flow in materials is increasingly recognized as complex, intermittent, and heterogeneous.
  • Understanding the underlying mechanisms of plastic deformation, such as dislocation avalanches, is crucial.

Purpose of the Study:

  • To investigate the spatial and temporal characteristics of dislocation avalanches during ice creep.
  • To map the three-dimensional distribution and behavior of these avalanches.

Main Methods:

  • Employed a multiple-transducers acoustic emission analysis to monitor deformation.
  • Performed three-dimensional mapping of dislocation avalanches in an ice crystal.
  • Utilized correlation analysis to study spatial and temporal patterns.

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Main Results:

  • Dislocation avalanches were found to be spatially clustered in a fractal pattern.
  • A significant space-time coupling was observed: avalanches closer in time were more likely to be closer in space.
  • Evidence suggests these patterns contribute to the self-organization of avalanches.

Conclusions:

  • Dislocation avalanches in ice exhibit fractal and self-organized behavior.
  • The observed space-time coupling is a key factor in the clustering of avalanches.
  • Findings enhance the understanding of complex plastic flow mechanisms in crystalline materials.