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Rheology of hard glassy materials.

A Zaccone1,2, E M Terentjev2

  • 1Department of Physics 'A Pontremoli', University of Milan, via Celoria 16, 20133 Milano, Italy.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 25, 2020
PubMed
Summary
This summary is machine-generated.

Understanding glassy solid yielding requires examining cage relaxation models. A new model, where the slowest relaxation dictates flow, accurately describes

Keywords:
amorphous materialsdisordered systemsglassesmetallic glassrheologyyielding

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Rheology

Background:

  • Glassy solids exhibit a yielding transition upon deformation, transitioning to plastic flow.
  • The underlying kinetic processes and time scales governing this yielding remain debated.

Purpose of the Study:

  • To investigate two constitutive models of cage relaxation in glassy solids.
  • To determine which model accurately describes the yielding transition and related phenomena.

Main Methods:

  • Microscopic model of nonaffine elasto-plasticity.
  • Examination of two constitutive models: one based on the fastest relaxation rate, and a newly formulated one based on the slowest relaxation rate.

Main Results:

  • The model assuming the fastest relaxation rate is incompatible with a finite elastic shear modulus at low frequencies.
  • The model assuming the slowest relaxation rate successfully describes yielding, nonaffine-to-affine crossover, and rate-stiffening in 'hard' glasses.

Conclusions:

  • The slowest relaxation process, not the fastest, controls the overall relaxation in 'hard' glassy solids.
  • A framework is proposed to differentiate 'soft' and 'hard' glasses based on shear-rate dependent structural relaxation time.