Modeling of thermal-assisted dislocation friction

Y. Liao*, L. D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

We generalize a model for friction at a sliding interface involving the motion of misfit dislocations to include the effect of thermally activated transitions across barriers. We obtain a comparatively simple form with the absolute zero-temperature Peierls barrier replaced by an effective Peierls barrier which varies exponentially with temperature, in agreement with recent experimental observations of thermally activated friction. Going further, we suggest a plausible method for generalizing the frictional drag at a more constitutive level by replacing the Peierls stress in a more general sense where the microstructure (e.g., dislocation density, grain size etc.) is built in. Last, but not least, we point out that when barriers are included the static coefficient of friction becomes larger than the dynamic coefficient of friction, which is an important connection to reality.

Original languageEnglish (US)
Pages (from-to)283-288
Number of pages6
JournalTribology Letters
Volume37
Issue number2
DOIs
StatePublished - Feb 2010

Keywords

  • Dynamic friction
  • Effective barrier
  • Friction mechanisms
  • Misfit
  • Sliding interface
  • Static friction
  • Temperature dependence

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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