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Hot spots in an athermal system.

Axelle Amon1, Van Bau Nguyen, Ary Bruand

  • 1Institut de Physique de Rennes (UMR UR1-CNRS 6251), Université de Rennes 1, Bâtiment 11A, Campus de Beaulieu, F-35042 Rennes, France.

Physical Review Letters
|May 1, 2012
PubMed
Summary
This summary is machine-generated.

Researchers investigated dynamical heterogeneities in amorphous glassy materials under slow shear. They identified localized "hot spots" of deformation, linking their clustering to shear bands and macroscopic plastic deformation, defining material fluidity.

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Area of Science:

  • Physics
  • Materials Science
  • Rheology

Background:

  • Amorphous glassy materials exhibit complex rheological behaviors.
  • Understanding dynamical heterogeneities is crucial for predicting material flow and deformation.
  • Soft glassy materials often display non-local and local rheological properties.

Purpose of the Study:

  • To experimentally investigate dynamical heterogeneities in a 3D granular packing under slow shear.
  • To spatially resolve deformation fields and identify localized regions of intense deformation.
  • To establish a quantitative link between these heterogeneities, shear banding, and macroscopic plastic deformation.

Main Methods:

  • Experimental study of a 3D granular packing model amorphous glassy material.
  • Utilizing diffusive wave spectroscopy to spatially resolve the deformation field.
  • Analyzing the spatial clustering and dynamics of deformation 'hot spots'.

Main Results:

  • Identified localized regions of strong deformation, termed 'hot spots,' with a mesoscopic size (approx. 10 grains).
  • Observed that the spatial clustering of these hot spots precedes the emergence of shear bands.
  • Quantified the association between hot spot appearance and macroscopic plastic deformation.

Conclusions:

  • Hot spots are key indicators of localized deformation in amorphous glassy materials.
  • The rate of hot spot occurrence provides a physical basis for the concept of fluidity in soft glassy materials.
  • This study offers insights into the micro-mechanisms governing the macroscopic rheology of amorphous solids.