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Contact changes near jamming.

Merlijn S van Deen1, Johannes Simon1, Zorana Zeravcic2

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Summary
This summary is machine-generated.

Contact changes in soft particle systems are key to understanding their mechanical behavior. This study reveals how contact creation/breaking affects shear modulus and linear response, especially near jamming.

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Area of Science:

  • Soft matter physics
  • Granular materials science
  • Statistical mechanics

Background:

  • Understanding the mechanical properties of soft particle packings is crucial for various applications.
  • Quasistatic shear deformation is a standard method to probe the response of granular materials.

Purpose of the Study:

  • To investigate the onset and impact of contact changes in soft harmonic particle packings under quasistatic shear.
  • To characterize the critical strain and shear modulus changes associated with contact events.

Main Methods:

  • Simulating soft harmonic particle packings under quasistatic shear.
  • Analyzing the creation and breaking of contacts at the particle level.
  • Calculating the critical strain and shear modulus ratios before and after contact changes.
  • Examining finite-size scaling relations.

Main Results:

  • The initial contact changes involve the creation or breaking of contacts on individual particles.
  • For large systems at finite pressure, critical strain vanishes, and the shear modulus ratio approaches one, indicating relevance of linear response.
  • In finite systems near jamming, critical strain also vanishes, but linear response breaks down after a single contact change.

Conclusions:

  • Contact dynamics significantly influence the mechanical response of soft particle systems.
  • Linear response is maintained in large systems, but breaks down in smaller systems approaching jamming.
  • The study provides insights into the critical behavior and scaling laws governing these systems.