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Mapping out the glassy landscape of a mesoscopic elastoplastic model
D Kumar1, S Patinet1, C E Maloney2
1PMMH, CNRS, ESPCI Paris, Université PSL, Sorbonne Université, Université Paris Cité, Paris, France.
The Journal of Chemical Physics
|November 8, 2022
Summary
This study models amorphous material plasticity under cyclic loading. Aging amorphous glasses reveals a phase separation, altering plastic deformation pathways and material behavior.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Computational Physics
Background:
- Amorphous materials exhibit complex plastic behavior under mechanical stress.
- Understanding the influence of aging on material properties is crucial for predicting performance.
Purpose of the Study:
- To develop a mesoscopic model for studying the plastic behavior of amorphous materials under cyclic loading.
- To investigate the effects of aging and disorder on the material's response to mechanical stress.
Main Methods:
- A depinning-like mesoscopic model with disordered thresholds and long-range elastic interactions.
- A "glass preparation" protocol mimicking thermalization and aging.
- Analysis of transition graphs to characterize disorder landscapes and plastic deformation pathways.
Main Results:
- The model successfully reproduces plastic behavior under monotonous loading.
- Cyclic loading studies reveal size and age dependence of the irreversibility transition.
- Aging induces a phase-separation-like process, breaking down accessible states into distinct regions based on plastic strain.
Conclusions:
- The developed model provides insights into the aging and cyclic loading effects on amorphous materials.
- Aging significantly alters the landscape of accessible states, leading to distinct plastic deformation regimes.
- The findings are relevant for designing and predicting the behavior of amorphous materials in various applications.
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