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Related Experiment Videos

Strain localization driven by structural relaxation in sheared amorphous solids.

E A Jagla1

  • 1Centro Atómico Bariloche and Instituto Balseiro, Comisión Nacional de Energía Atómica, 8400 Bariloche, Argentina.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2007
PubMed
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This study models amorphous materials, revealing that structural relaxation causes inhomogeneous deformation like shear bands. This phenomenon is linked to a negative correlation between strain rate and stress, impacting material behavior under strain.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational modeling

Background:

  • Amorphous materials exhibit complex mechanical behaviors, including plasticity and shear banding.
  • Understanding the origins of strain localization in these materials is crucial for predicting their response to external stimuli.

Purpose of the Study:

  • To model a two-dimensional amorphous material's response to external strain.
  • To investigate the role of structural relaxation in plastic deformation and strain localization.
  • To identify the underlying mechanisms responsible for shear band formation.

Main Methods:

  • A mesoscopic model representing amorphous materials as coupled elemental pieces.
  • Introduction of plasticity via multiple energy minima in elemental constituents.

Related Experiment Videos

  • Simulation of material shearing through elemental slip events.
  • Analysis of deformation patterns under fixed versus dynamically rearranging energy landscapes.

    • Main Results:

    • Uniform deformation observed when the energy landscape is fixed.
    • Development of inhomogeneous deformation (shear bands) with structural relaxation.
    • Emergence of stick-slip-like motion at shear bands at low shear rates.
    • Identification of a negative correlation between strain rate and stress as the origin of strain localization.
    • Reproduction of stress peaks and their dependence on sample age.

    Conclusions:

    • Structural relaxation is a key factor driving inhomogeneous deformation and shear banding in amorphous materials.
    • The model successfully captures fundamental aspects of amorphous material rheology, including stress dynamics.
    • The findings provide insights into the mechanical failure mechanisms of disordered materials.