Friction-induced intermittent motion affected by surface roughness of brake friction materials

S. M. Lee, M. W. Shin, H. Jang

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


The effect of the surface roughness of the brake friction material on friction-induced instability was studied. Commercial friction materials with different surface roughness levels were tested using a scale brake dynamometer to find a correlation between the surface roughness and friction oscillation. The results showed that the normal contact stiffness was strongly affected by surface roughness and played a significant role in determining the friction oscillation pattern. The friction force oscillation changed from stick-slip to sinusoidal oscillation and steady sliding as the sliding velocity increased, and the velocity ranges for different oscillatory patterns were changed by the surface roughness. A smooth surface with glazed patches produced friction oscillation with larger amplitudes, and the oscillation was maintained over a wider range of sliding velocities due to the high contact stiffness. The correlation between the contact stiffness and surface roughness suggested that friction-induced instability might be avoided by designing the friction material to have low surface stiffness.

Original languageEnglish
Pages (from-to)29-34
Number of pages6
Issue number1-2
Publication statusPublished - 2013 Nov 30


  • Brake/clutch materials
  • Contact mechanics
  • Stick-slip
  • Surface topography

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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