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Extremal model for amorphous media plasticity.

Jean-Christophe Baret1, Damien Vandembroucq, Stéphane Roux

  • 1Unité Mixte CNRS/Saint-Gobain Surface du Verre et Interfaces, 39 Quai Lucien Lefranc, 93303 Aubervilliers cedex, France.

Physical Review Letters
|November 22, 2002
PubMed
Summary
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This study reveals that plastic strain in amorphous materials concentrates along specific directions due to long-range correlations in slip events, impacting the material's yield stress.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Mechanics

Background:

  • Plasticity in amorphous materials is complex and not fully understood.
  • Understanding material deformation is crucial for engineering applications.

Purpose of the Study:

  • To investigate the steady-state behavior of amorphous material plasticity.
  • To analyze the development of correlations in local slip events.
  • To characterize the scaling laws and strain localization.

Main Methods:

  • Utilized an extremal model for plasticity.
  • Employed numerical simulations in a 2D antiplane geometry.
  • Analyzed steady-state conditions and slip event dynamics.

Main Results:

Related Experiment Videos

  • Observed long-range spatial and temporal correlations in local slip events.
  • Identified nontrivial and anisotropic scaling laws for plastic strain.
  • Demonstrated plastic strain concentration perpendicular to the displacement gradient.
  • Revealed scaling properties of the macroscopic yield stress linked to activity localization.

Conclusions:

  • The model exhibits a depinning transition, with yield stress reflecting localized plastic activity.
  • Anisotropic scaling laws and strain localization are key features of amorphous material plasticity.
  • Numerical simulations provide insights into the fundamental mechanisms of plastic deformation.