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Discrete dislocation plasticity analysis of loading rate-dependent static friction.

H Song1, V S Deshpande2, E Van der Giessen1

  • 1Zernike Institute for Advanced Materials , University of Groningen , 9747 AG Groningen, The Netherlands.

Proceedings. Mathematical, Physical, and Engineering Sciences
|September 13, 2016
PubMed
Summary
This summary is machine-generated.

Friction arises from material deformation and interface adhesion. This study models how these factors, influenced by size and loading rate, determine friction strength in micro-scale contacts.

Keywords:
adhesiondiscrete dislocation plasticityfriction strengthloading rate

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Area of Science:

  • Materials Science
  • Tribology
  • Solid Mechanics

Background:

  • Frictional force on rough surfaces results from material deformation and interfacial adhesion.
  • Both plastic deformation and adhesion can exhibit size and rate dependency at the microscale.

Purpose of the Study:

  • To develop a model understanding the rate dependence of friction for microscale asperities.
  • To investigate the interplay between discrete dislocation plasticity and adhesion in determining friction strength.

Main Methods:

  • A two-dimensional model was developed.
  • The model incorporates discrete dislocation plasticity within a face-centered cubic crystal.
  • Adhesion at the interface was also included in the model.

Main Results:

  • Friction strength shows two plateaus based on contact size: adhesion-controlled at small scales and plasticity-controlled at large scales.
  • A transition regime at intermediate scales results from partial de-cohesion and size-dependent plasticity.
  • Friction is influenced by dislocation properties, interfacial properties, and loading rate.

Conclusions:

  • Friction strength is a result of the competition between adhesion and plasticity.
  • The model provides insights into the complex size and rate dependencies of microscale friction.
  • Understanding these mechanisms is crucial for predicting and controlling friction in various applications.