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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Rheology

Background:

  • Amorphous solids lack long-range order, making their mechanical behavior complex.
  • Understanding plasticity in these materials is key to predicting their stability and failure.
  • Conventional methods often rely on bulk properties, which may not fully capture local deformation mechanisms.

Purpose of the Study:

  • To investigate the correlation between local yield stress and plastic rearrangements in amorphous solids.
  • To assess the predictive power of local yield stress compared to traditional structural properties.
  • To determine the persistence of these localized plastic sites under deformation.

Main Methods:

  • Fabrication of model amorphous solids using various quench protocols.
  • Direct local probing of shear stress thresholds to measure local yield stress.
  • Remote loading in shear to observe plastic rearrangements.
  • Comparison of local yield stress with conventional structural properties for predictive accuracy.

Main Results:

  • A strong correlation was found between local yield stress and observed plastic rearrangements.
  • Local yield stress demonstrated higher predictive power for plastic activity than structural properties.
  • Identified low local yield stress sites were persistent, predicting deformation events over multiple rearrangements.

Conclusions:

  • Local yield stress is a critical and persistent indicator of plastic activity in amorphous solids.
  • This nonperturbative approach provides insights into transition pathways governing material stability.
  • Modeling plasticity in amorphous solids should consider the evolution of local zones of weakness.