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Dislocation Glides in Granular Media.

Fumiaki Nakai1, Takashi Uneyama2, Yuto Sasaki1

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Summary
This summary is machine-generated.

Dislocation glide occurs in granular crystals at low friction, reducing yield stress. High friction causes crystal breakdown, unlike in atomic crystals.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Geophysics

Background:

  • Atomic crystals deform plastically through dislocation glide at low stresses.
  • The behavior of dislocations in macroscopic frictional granular media is not well understood.

Purpose of the Study:

  • To investigate the occurrence and impact of dislocation glide in granular crystals.
  • To determine the rheological response of granular crystals with edge dislocations under varying friction.

Main Methods:

  • Simulations of structural and rheological responses.
  • Analysis of granular crystals with an edge dislocation.

Main Results:

  • Dislocation glide observed at low interparticle friction coefficients.
  • Crystal order breakdown at high friction coefficients.
  • Yield stress significantly reduced in the presence of dislocation glide.
  • Yield stress shows a linear dependence on the interparticle friction coefficient.

Conclusions:

  • Dislocation glide is a viable deformation mechanism in granular crystals at low friction.
  • The interplay between Peierls stress and interparticle friction governs the yield stress in these systems.