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This study reveals that plastic rearrangements in amorphous glasses are linked to local yield stresses. More relaxed glasses exhibit higher plastic thresholds and stress drops follow exponential distributions.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational physics

Background:

  • Understanding the mechanical behavior of amorphous solids like glasses is crucial.
  • Plasticity in glasses is mediated by localized rearrangements, but their atomic-scale origins remain debated.
  • Previous methods for studying atomic-scale plasticity have limitations in sampling and control.

Purpose of the Study:

  • To develop and extend a computational method for calculating local yield stresses in two-dimensional Lennard-Jones glasses.
  • To investigate the relationship between local yield stresses and plastic rearrangements under shear.
  • To analyze the influence of preparation protocols (quench rates) on glass structure and mechanical response.

Main Methods:

  • Utilized a novel method to compute local yield stresses at the atomic scale.
  • Simulated plastic rearrangements in model glasses prepared with different quench protocols.
  • Analyzed the correlation between low yield stress regions and plastic activity.
  • Examined the distribution and amplitude of stress drops during plastic events.
  • Investigated the dependence of local yield stress on shear orientation and probing zone size.

Main Results:

  • Plastic activity strongly correlates with low local yield stress regions, especially in more relaxed glasses.
  • The distribution of local yield stresses is highly dependent on the glass preparation (quench protocol).
  • Stress drops during plastic rearrangements follow exponential distributions, supporting theoretical conjectures.
  • The amplitude of local plastic rearrangements generally increases with the local yield stress.
  • Local yield stress varies with shear orientation, correlating with plastic event locations.

Conclusions:

  • Plastic rearrangements in glasses are a consequence of shear transformation zones with inherent weak slip planes.
  • The developed method provides a physically grounded approach to model plasticity in amorphous materials.
  • The findings offer insights into the mesoscopic nature of plasticity and validate continuum models.
  • The study highlights the critical role of structural relaxation in determining the mechanical properties of glasses.