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Area of Science:

  • Physics
  • Materials Science
  • Complex Systems

Background:

  • Granular materials exhibit complex behaviors under compression, including jamming and force network formation.
  • The Gardner transition in disordered systems describes a shift from an amorphous to an ordered state.
  • Understanding force contact variability is crucial for predicting granular material properties.

Purpose of the Study:

  • To experimentally investigate the Gardner-like crossover in a two-dimensional bidisperse granular crystal.
  • To analyze the transition from variable to persistent force contacts under uniaxial compression.
  • To correlate force network stability with particle position variability and system density.

Main Methods:

  • Utilized a two-dimensional bidisperse granular crystal composed of photoelastic disks.
  • Applied uniaxial compression and analyzed particle positions and force networks.
  • Compared configurations to initial states and reinitialized ensembles to assess contact persistence.

Main Results:

  • Observed a Gardner-like crossover in force contact behavior.
  • Force contacts were undetermined below a critical density and became persistent above it.
  • This transition was linked to microscopic asperities on the photoelastic disks.

Conclusions:

  • The study provides experimental evidence for a Gardner-like transition in granular crystals.
  • Force contact persistence is density-dependent, transitioning from variable to stable states.
  • Microscopic surface properties significantly influence the mechanical response of granular systems.