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Unsoundness in aggregates due to volume changes is primarily caused by the physical alterations aggregates undergo, such as freezing and thawing, thermal changes, and wetting and drying. Unsound aggregates, when subjected to these changes, result in volume change upon disintegration. This, in turn, contributes to the deterioration of concrete, including scaling, pop-outs, and cracking. Particular types of aggregates, such as porous flints, cherts, and those containing clay minerals, are...
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Elastic avalanches reveal marginal behavior in amorphous solids.

Baoshuang Shang1,2, Pengfei Guan3, Jean-Louis Barrat4

  • 1Beijing Computational Science Research Center, Beijing 100193, China.

Proceedings of the National Academy of Sciences of the United States of America
|December 18, 2019
PubMed
Summary
This summary is machine-generated.

Plasticity in amorphous solids involves complex, nonlinear behavior. This study finds that the distribution of plastic activity in glass-forming systems aligns with theoretical predictions for systems near the jamming transition, suggesting marginal stability.

Keywords:
amorphous solidelastic avalanchemarginal stability

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Statistical mechanics

Background:

  • Amorphous solids exhibit complex mechanical deformation beyond simple elastic linearity.
  • Microscopic plasticity in these materials is linked to nonlinear elastic coefficients and energy landscape complexity.
  • Scale-free plastic activity, or avalanches, is a characteristic response in the athermal quasistatic regime.

Purpose of the Study:

  • To characterize the distribution of plastic avalanches in simple models of glass-forming systems.
  • To compare these distributions with theoretical mean-field predictions.
  • To investigate the implications for understanding the mechanical behavior and stability of amorphous solids.

Main Methods:

  • Simulation of simple models of glass-forming systems.
  • Analysis of the distribution of plastic avalanches.
  • Comparison of empirical scaling with theoretical mean-field calculations.
  • Examination of system size and age effects.

Main Results:

  • The scaling of plastic avalanche distributions is compatible with mean-field predictions for systems above the jamming transition.
  • Systems exhibiting jamming demonstrate marginal stability.
  • Scaling relations observed in the stationary state are confirmed in the elastic regime.
  • Marginal stability appears systematic in the thermodynamic limit.

Conclusions:

  • The study provides empirical support for theoretical models describing plastic deformation in amorphous solids.
  • Glass-forming systems near the jamming transition exhibit marginal stability, a key characteristic.
  • Understanding these scaling behaviors is crucial for predicting the mechanical response of amorphous materials.