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

被引:71
作者
Kim, Jin Woo [1 ]
Joo, Byung Soo [1 ]
Jang, Ho [1 ]
机构
[1] Korea Univ, Dept Mat Sci & Engn, Seoul 02841, South Korea
关键词
Surface topography; Wear particles; Brake; Stick-slip; TIME-DEPENDENT FRICTION; STICK-SLIP; SQUEAL GENERATION; TOPOGRAPHY; BEHAVIOR;
D O I
10.1016/j.triboint.2019.02.034
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
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.
引用
收藏
页码:38 / 45
页数:8
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