The effect of contact area on velocity weakening of the friction coefficient and friction instability: A case study on brake friction materials

Jin Woo Kim, Byung Soo Joo, Ho Jang

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Newly found evidence on the negative slope of the friction-velocity curve is described in terms of the contact area on the surface of brake friction materials. The tribotests were performed using two commercial friction materials with and without steel fibers. The results showed that velocity weakening friction was pronounced in the friction materials containing steel fibers, which facilitated high pressure contact areas by the agglomeration of wear debris. The size of the high pressure contact area increased as the sliding velocity decreased, which supported the correlation among velocity weakening friction, friction instability, and high pressure contact areas. The pronounced velocity dependence of the friction coefficient due to transient contact area was highly relevant to noise propensity of the friction material.

Original languageEnglish
Pages (from-to)38-45
Number of pages8
JournalTribology International
Volume135
DOIs
Publication statusPublished - 2019 Jul 1

Keywords

  • Brake
  • Stick-slip
  • Surface topography
  • Wear particles

ASJC Scopus subject areas

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

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