Molecular dynamics simulation of rolling friction using nanosize spheres

W. G. Lee, K. H. Cho, Ho Jang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The rolling resistance of a sphere on an atomically flat surface was studied by molecular dynamics simulation carried out by rolling a rigid Ni sphere on a copper (100) surface. Spheres of 6 and 12 nm diameters were used for rolling simulations after indentation up to 10 Å in depth and the computations carried out using embedded atom potentials of Ni and Cu, assuming either active molecular interaction at the contacts (normal potentials) or the presence of a passivation layer on the sphere. Results showed that the sphere size, penetration depth, and adhesion at the rolling interface strongly affected the rolling friction. When molecular interactions were allowed at the rolling contacts, the average rolling friction coefficient was higher and severe oscillations in the friction force was observed. On the other hand, a sphere with a passivation layer produced more dislocations in the copper substrate during rolling and the motion of the dislocations affected the coefficient of rolling friction and the size of the friction force oscillations. This work also suggested that rolling friction at the nanoscale level was similar to the macroscopic rolling condition during strain hardening of metals due to severe dislocation multiplication underneath the nanosphere in nanorolling.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalTribology Letters
Volume33
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1

Fingerprint

Molecular dynamics
friction
Friction
molecular dynamics
Computer simulation
Molecular interactions
simulation
Passivation
Copper
Rolling resistance
molecular interactions
Nanospheres
passivity
Indentation
Strain hardening
Adhesion
Metals
copper
oscillations
Atoms

Keywords

  • Embedded atom potential
  • Indentation
  • Molecular dynamics
  • Nanorolling
  • Rolling friction

ASJC Scopus subject areas

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

Cite this

Molecular dynamics simulation of rolling friction using nanosize spheres. / Lee, W. G.; Cho, K. H.; Jang, Ho.

In: Tribology Letters, Vol. 33, No. 1, 01.01.2009, p. 37-43.

Research output: Contribution to journalArticle

Lee, W. G. ; Cho, K. H. ; Jang, Ho. / Molecular dynamics simulation of rolling friction using nanosize spheres. In: Tribology Letters. 2009 ; Vol. 33, No. 1. pp. 37-43.
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