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Permanent shear localization in dense disordered materials due to microscopic inertia.
Vishwas V Vasisht1, Magali Le Goff2, Kirsten Martens2
1Department of Physics, Indian Institute of Technology, Palakkad, 678623, India.
The European Physical Journal. E, Soft Matter
|November 2, 2023
Summary
Computer simulations reveal shear localization in dense disordered solids. A new continuum model explains this phenomenon, highlighting the necessity of system size for flow instability in materials science.
Area of Science:
- Condensed matter physics
- Materials science
- Computational physics
Background:
- Dense disordered solids exhibit complex flow behaviors.
- Understanding shear localization is crucial for material design and failure prediction.
Purpose of the Study:
- To investigate the emergence of shear localization in dense disordered solids under homogeneous driving conditions.
- To develop a continuum model that explains the simulation findings and predicts critical system size for instability.
Main Methods:
- Three-dimensional (3D) computer simulations of dense disordered solids.
- Development of a continuum model coupling local flow dynamics with a kinetic temperature field.
- Analysis of simulation data and comparison with continuum model predictions.
Main Results:
- First-time observation of shear localization in stationary flow of dense disordered solids via simulations.
- The continuum model identifies coupling to a kinetic temperature field as necessary for shear localization.
- A minimum system size is predicted as essential for accommodating the flow instability.
Conclusions:
- Shear localization in dense disordered solids is linked to coupled flow and kinetic temperature dynamics.
- The developed continuum model accurately predicts the critical system size for shear localization, aligning with simulation results.
- This work provides a theoretical framework and simulation evidence for understanding flow instabilities in disordered materials.
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