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Vibration-induced jamming transition in granular media
1Institut de Génie Atomique, Département de Physique, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Summary
This study reveals how granular materials change from solid-like to fluid-like behavior under vibration. The research uses a torsion oscillator to measure frequency response, identifying a crossover point in dynamic behavior.
Area of Science:
- Physics
- Materials Science
- Complex Systems
Background:
- Granular materials exhibit complex behaviors influenced by external stimuli.
- Understanding the dynamic response of granular media is crucial for various applications.
Purpose of the Study:
- To investigate the quasistatic frequency response of granular media under controlled vibration.
- To characterize the transition in dynamic behavior from solid-like to fluid-like states.
Main Methods:
- Utilized a forced torsion oscillator method to measure frequency response.
- Applied weak, high-frequency vibrations (f(s)) below the fluidization limit.
- Analyzed the loss factor peak as a function of vibration intensity (Gamma) and forcing frequency (f(p)).
Main Results:
- Observed a loss factor peak in the oscillator response, indicating a transition.
- Identified Arrhenius-like behavior in the peak's position, correlating forcing frequency with vibration intensity.
- Modeled the behavior as a stochastic hopping process, with characteristic vibration intensity and time scales.
Conclusions:
- The loss factor peak signifies a crossover in dynamic behavior, from jammed solid-like to viscous fluid-like states.
- The observed behavior can be described by stochastic hopping, dependent on vibration intensity and time scales.
- The findings provide insights into the fundamental dynamics of vibrated granular systems.