English Abstract
Studies on the Friction Mechanism of Silica - Filled and Carbon Black - Filled SBRs
Naoya Amino
Yokohama Rubber Co., Ltd., Kanagawa, Japan
Yoshitaka Uchiyama
Tomoaki Iwai
Department of Mechanical Systems Engineering, Kanazawa University, Kanazawa, Japan
Masato Maeda
Toyota Body Co., Ltd., Aichi, Japan
Nippon Gomu Kyokaishi, (2004), 77(5), 173-179 General Review in Japanese.

It is known that silica-filled rubbers improve the trade-off between wet traction and the rolling resistance of tires, compared with carbon black-filled rubbers. It is generally considered that the adhesion component of the friction of silica-filled rubbers is higher than that of carbon-filled rubbers, however there are few reports that show this difference in the adhesion components of friction.
In this paper, the adhesion component and the hysteresis component of friction for carbon black-filled and silica-filled rubbers are investigated. Comparing the friction force-frequency curves (F- curves) and the viscoelastic properties establishes that the friction force

F has the form:
F = As + kE' -1/3 tan
where A is the area of contact, s is the shear strength of the rubbers and k is constant. The first term represents the adhesion component of the friction and the second term represents the hysteresis component. It is found that the adhesion component of silica-filled rubbers is higher than that of carbon black- filled rubbers.

Friction, Adhesion, Hysteresis, Viscoelastic property, Silica-filled SBR, Carbon black-filled SBR, Frequency