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Francesco Arceri1, Eric I Corwin1, Varda F Hagh1,2

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Jammed solids store memory through cyclic shear, but only if they are marginally stable. Highly stable packings require yielding before memory encoding occurs, primarily within the shear band.

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Area of Science:

  • Physics of soft and amorphous matter
  • Materials science
  • Mechanical engineering

Background:

  • Cyclic shear is a known method for memory encoding in jammed solids.
  • The precise mechanisms linking memory storage to amorphous structure remain unclear.
  • The role of structural stability in this memory encoding process needs further investigation.

Purpose of the Study:

  • To investigate the influence of amorphous structure stability on memory encoding via cyclic shear.
  • To determine the conditions under which jammed solids can reliably store memory.
  • To explore the relationship between structural stability, yielding, and memory formation.

Main Methods:

  • Studied memory encoding in jammed sphere packings subjected to cyclic shear.
  • Compared memory storage in marginally stable versus highly stable amorphous structures.
  • Generated highly stable packings by minimizing potential energy (positional and radial degrees of freedom).

Main Results:

  • Marginal stability is essential for jammed solids to store memory via cyclic shear.
  • Highly stable packings initially exhibit brittle yielding before memory encoding can occur.
  • Cyclic shear training in highly stable packings is localized within the shear band, which is found to be marginally stable.

Conclusions:

  • Jammed solids require marginal stability to effectively encode memory through cyclic shear.
  • The transition from brittle yielding to memory encoding in highly stable packings is linked to the emergence of marginal stability in shear bands.
  • Understanding structural stability is key to controlling and utilizing memory effects in jammed materials.