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Slow Coarsening in Jammed Athermal Soft Particle Suspensions.
R N Chacko1, P Sollich2,3, S M Fielding1
1Department of Physics, Durham University, Science Laboratories, South Road, Durham DH1 3LE, United Kingdom.
Physical Review Letters
|October 2, 2019
Summary
We simulated jammed soft particles, observing slow dynamics and intermittent "hot spots" of deformation. These localized events reveal how elastic energy releases in disordered materials over time.
Area of Science:
- Soft matter physics
- Non-equilibrium statistical mechanics
- Computational physics
Background:
- Jamming and glass transitions are critical phenomena in disordered systems.
- Athermal systems lack thermal fluctuations, making their dynamics distinct.
- Understanding energy release mechanisms is key to material stability.
Purpose of the Study:
- To investigate the slow dynamics of jammed, athermal soft particles after a temperature quench.
- To characterize the nature of particle motion and energy dissipation.
- To explore the spatial and temporal patterns of nonaffine deformation.
Main Methods:
- Molecular dynamics simulations of repulsive soft particles in a solvent.
- Analysis of particle speed decay, deformation patterns, and velocity fields.
- Tracking of localized "hot spots" and their evolution.
Main Results:
- Observed power-law decay in particle speed, indicating slow dynamics.
- Identified spatially localized, temporally intermittent "hot spots" of nonaffine deformation.
- Found long-ranged velocity swirls and coarsening of hot spot patterns over time.
Conclusions:
- The dynamics are driven by gradual elastic energy release.
- Intermittent hot spots and their collective behavior govern the slow relaxation.
- Results offer insights into plastic events in amorphous materials.
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