Static friction modeling in the presence of soft thin metallic films

Zhiqiang Liu, Anne Neville, Robert Lewis Reuben

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A numerical model is presented for computing the static friction coefficient of rough surfaces with a soft thin film. In the calculation, an improved model, based on that due to Derjaguin et at., is used in conjunction with an elastic-plastic contact model for contact with a soft coating. The effects of the film thickness and surface roughness on the static friction coefficient and contact are investigated. The numerical results reflect published experimental observations and show the static friction coefficient depends strongly on surface film thickness, external force and surface roughness. The static friction coefficient (mu) increases with the surface film thickness when the plasticity index psigreater than or equal to0.5 whilst mu increases with decreasing film thickness in the very thin filin regime when psi=0.25 and F/A(n)E <10(-4). For real rough surfaces, contact and friction behavior is probably heavily influenced by the existence of such soft, thin surface films, which increase the contact area due to plastic deformation of the film and the contact stiffness of the surface in the case of thin film and light load.

Original languageEnglish
Pages (from-to)27-35
Number of pages9
JournalJournal of Tribology
Volume124
Issue number1
DOIs
Publication statusPublished - Jan 2002

Keywords

  • ROUGH SURFACES
  • SUBBOUNDARY LUBRICATION
  • ELASTIC SPHERE
  • CONTACT MODEL
  • RIGID PLANE
  • ADHESION
  • DEFORMATION
  • STICKING
  • WEAR

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