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Plastic response and correlations in athermally sheared amorphous solids.

F Puosi1,2, J Rottler3, J-L Barrat1,2,4

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Plastic deformation in amorphous solids involves atomic rearrangements. This study reveals that prior shear strain enhances plastic response and uncovers a fluctuation-dissipation relation at high shear rates.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Irreversible deformation in amorphous solids initiates from localized atomic rearrangements.
  • Understanding spatiotemporal correlations between these plastic events is crucial for predicting material behavior.
  • Previous research has explored numerical and experimental aspects of these correlations.

Purpose of the Study:

  • To investigate the plastic response of a 2D amorphous solid to triggered shear transformations.
  • To elucidate the role of prior shear strain on plastic event correlations.
  • To examine the relationship between plastic response and correlation under varying shear rates.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model a 2D amorphous solid.
  • Artificial local shear transformations were triggered within the simulated system.
  • The system's response was analyzed in both as-quenched and pre-strained configurations.
  • Simulations were conducted at different shear rates to explore rate-dependent phenomena.

Main Results:

  • Plastic response was minimal in as-quenched configurations but significant after pre-shear.
  • The plastic response exhibited a fourfold symmetry, indicative of stress redistribution.
  • Evidence for a fluctuation-dissipation relation was observed at high shear rates.
  • This relation appeared to break down at lower shear rates.

Conclusions:

  • Pre-imposed shear strain is essential for observing significant plastic response in amorphous solids.
  • The observed symmetry in plastic response is linked to shear stress redistribution mechanisms.
  • A fluctuation-dissipation relation governs the connection between plastic events and correlations at high shear rates, but this breaks down at lower rates.