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Shock loading granular rings in a Hele-Shaw cell creates instability patterns. Particle shape and confinement influence pattern transition from smooth to finger-like, revealing key physics of granular media flowability.

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Area of Science:

  • Physics
  • Geophysics
  • Materials Science

Background:

  • Granular materials exhibit complex behaviors under external stimuli.
  • Instability patterns in confined granular media are not fully understood.
  • Hele-Shaw cells provide a controlled environment to study granular dynamics.

Purpose of the Study:

  • Investigate the initiation and growth of instability patterns in shock-loaded granular rings.
  • Determine how particle morphology and confinement affect pattern formation.
  • Correlate grain-scale physics with macro-scale instability patterns.

Main Methods:

  • Experimental investigation of granular rings in a Hele-Shaw cell.
  • Numerical simulations at the grain scale.
  • Analysis of instability pattern growth modes and transition criteria.

Main Results:

  • Pattern transition from smooth, self-similar growth to unstable, finger-like structures with tip-splitting.
  • Irregular particle shapes and narrower gaps hinder fluidization, promoting instability.
  • Incipient perturbation growth and compaction front transmission dictate pattern evolution.
  • Heterogeneous non-linear force networks in granular media drive the stable-to-unstable transition.

Conclusions:

  • Macroscopic flowability is a key indicator of shock-induced granular instability.
  • Grain-scale physics significantly influence the nature of macro-scale instability patterns.
  • Understanding these dynamics is crucial for predicting granular material behavior under shock loading.