The correlation between contact stiffness and stick-slip of brake friction materials

S. M. Lee; M. W. Shin; W. K. Lee; H. Jang

doi:10.1016/j.wear.2012.12.017

The correlation between contact stiffness and stick-slip of brake friction materials

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

Research output: Contribution to journal › Article › peer-review

63 Citations (Scopus)

Abstract

Friction-induced stick-slip of brake friction materials was investigated by examining the correlation between contact stiffness (k_n) and surface topography changed by material wear at the sliding interface. By changing the surface roughness and thickness of the friction material, friction instability during sliding at low speeds was analyzed using a scale brake dynamometer. The results showed that the intensity and frequency of stick-slip were determined by the relative magnitudes of tangential contact stiffness (k_t), bulk stiffness (k_b), sliding velocity, and the difference (δμ) between the static (μ_s) and kinetic coefficients (μ_k) of friction and these results were supported by the contact theories proposed by Greenwood and Williamson. While Friction materials with rough surfaces showed small stick-slip amplitudes due to small tangential contact stiffness (k_t), friction materials with high compressibility exhibited pronounced stick-slip because the amplitude inversely varied with the bulk stiffness (k_b). The high stick-slip propensity observed from heat affected friction materials also supported the correlation of the surface condition and contact stiffness (k_n).

Original language	English
Pages (from-to)	1414-1420
Number of pages	7
Journal	Wear
Volume	302
Issue number	1-2
DOIs	https://doi.org/10.1016/j.wear.2012.12.017
Publication status	Published - 2013 Apr

Bibliographical note

Funding Information:
This study was supported by the Ministry of Knowledge Economy (MKE) through the Parts and Materials Development Program (No. 10040819 ).

Keywords

Brake
Friction material
Stick-slip
Surface topography
Tangential contact stiffness

ASJC Scopus subject areas

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

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10.1016/j.wear.2012.12.017

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title = "The correlation between contact stiffness and stick-slip of brake friction materials",

abstract = "Friction-induced stick-slip of brake friction materials was investigated by examining the correlation between contact stiffness (kn) and surface topography changed by material wear at the sliding interface. By changing the surface roughness and thickness of the friction material, friction instability during sliding at low speeds was analyzed using a scale brake dynamometer. The results showed that the intensity and frequency of stick-slip were determined by the relative magnitudes of tangential contact stiffness (kt), bulk stiffness (kb), sliding velocity, and the difference (δμ) between the static (μs) and kinetic coefficients (μk) of friction and these results were supported by the contact theories proposed by Greenwood and Williamson. While Friction materials with rough surfaces showed small stick-slip amplitudes due to small tangential contact stiffness (kt), friction materials with high compressibility exhibited pronounced stick-slip because the amplitude inversely varied with the bulk stiffness (kb). The high stick-slip propensity observed from heat affected friction materials also supported the correlation of the surface condition and contact stiffness (kn).",

keywords = "Brake, Friction material, Stick-slip, Surface topography, Tangential contact stiffness",

author = "Lee, {S. M.} and Shin, {M. W.} and Lee, {W. K.} and H. Jang",

note = "Funding Information: This study was supported by the Ministry of Knowledge Economy (MKE) through the Parts and Materials Development Program (No. 10040819 ).",

year = "2013",

month = apr,

doi = "10.1016/j.wear.2012.12.017",

language = "English",

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AU - Lee, S. M.

AU - Shin, M. W.

AU - Lee, W. K.

AU - Jang, H.

N1 - Funding Information: This study was supported by the Ministry of Knowledge Economy (MKE) through the Parts and Materials Development Program (No. 10040819 ).

PY - 2013/4

Y1 - 2013/4

N2 - Friction-induced stick-slip of brake friction materials was investigated by examining the correlation between contact stiffness (kn) and surface topography changed by material wear at the sliding interface. By changing the surface roughness and thickness of the friction material, friction instability during sliding at low speeds was analyzed using a scale brake dynamometer. The results showed that the intensity and frequency of stick-slip were determined by the relative magnitudes of tangential contact stiffness (kt), bulk stiffness (kb), sliding velocity, and the difference (δμ) between the static (μs) and kinetic coefficients (μk) of friction and these results were supported by the contact theories proposed by Greenwood and Williamson. While Friction materials with rough surfaces showed small stick-slip amplitudes due to small tangential contact stiffness (kt), friction materials with high compressibility exhibited pronounced stick-slip because the amplitude inversely varied with the bulk stiffness (kb). The high stick-slip propensity observed from heat affected friction materials also supported the correlation of the surface condition and contact stiffness (kn).

AB - Friction-induced stick-slip of brake friction materials was investigated by examining the correlation between contact stiffness (kn) and surface topography changed by material wear at the sliding interface. By changing the surface roughness and thickness of the friction material, friction instability during sliding at low speeds was analyzed using a scale brake dynamometer. The results showed that the intensity and frequency of stick-slip were determined by the relative magnitudes of tangential contact stiffness (kt), bulk stiffness (kb), sliding velocity, and the difference (δμ) between the static (μs) and kinetic coefficients (μk) of friction and these results were supported by the contact theories proposed by Greenwood and Williamson. While Friction materials with rough surfaces showed small stick-slip amplitudes due to small tangential contact stiffness (kt), friction materials with high compressibility exhibited pronounced stick-slip because the amplitude inversely varied with the bulk stiffness (kb). The high stick-slip propensity observed from heat affected friction materials also supported the correlation of the surface condition and contact stiffness (kn).

KW - Brake

KW - Friction material

KW - Stick-slip

KW - Surface topography

KW - Tangential contact stiffness

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DO - 10.1016/j.wear.2012.12.017

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SP - 1414

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JO - Wear

JF - Wear

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ER -

The correlation between contact stiffness and stick-slip of brake friction materials

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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