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Ferdinando Giacco¹, Lucilla de Arcangelis, Massimo Pica Ciamarra

¹Department of Mathematics and Physics, University of Campania "Luigi Vanvitelli", Caserta, Italy. eugenio.lippiello@unicampania.it ferdinando.giacco@unicampania.it.

|November 30, 2017

Summary

Granular materials jam not when kinetic energy disappears, but when rattler particles dominate. The energy relaxation shows a double power-law decay, revealing backbone and rattler particle interactions.

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Area of Science:

Physics
Materials Science
Complex Systems

Background:

Granular materials exhibit jamming, a transition where they resist applied stresses through force networks.
Understanding the dynamics of jamming is crucial for predicting material behavior.

Purpose of the Study:

To investigate the dynamics of the jamming transition in granular materials.
To determine the role of kinetic energy and particle behavior during jamming.

Main Methods:

Numerical simulations of granular material dynamics during jamming.
Analysis of kinetic energy evolution and particle motion.

Main Results:

Jamming transition does not coincide with the vanishing of kinetic energy.
Kinetic energy in jammed states is dominated by 'rattler' particles scattering within cages.
Kinetic energy relaxation follows a double power-law decay.

Conclusions:

The jamming transition is characterized by the emergence of rattler particle dynamics, not just the cessation of motion.
The observed double power-law decay provides insight into the interplay between the force-bearing backbone and mobile rattler particles in jammed granular systems.