Europhys. Lett.
Volume 61, Number 5, March 2003
Page(s) 620 - 624
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 01 February 2003
DOI: 10.1209/epl/i2003-00116-1
Europhys. Lett., 61 (5) , pp. 620-624 (2003)

The effect of inertial normal force on the rolling friction of a soft sphere on a hard plane

Y. Xu and K. L. Yung

Department of ISE, The HK Polytechnic University Hung Hom, Kowloon, Hong Kong, PRC

(Received 5 June 2002; accepted in final form 12 December 2002)

Previously, in the rolling-friction analysis, the normal compression force was assumed to be independent of the rolling speed. In this study, it is found that the normal compression force of a soft sphere on a hard plane depends on its rolling speed as the inertial force is taken into consideration. A new expression of the rolling frictional torque, which is not proportional to the apparent normal force as the previous one is derived. It is shown that the relation between rolling frictional torque and rolling speed is nonlinear as the inertial force is considered.

46.55.+d - Tribology and mechanical contacts.
62.20.-x - Mechanical properties of solids.
81.40.-z - Treatment of materials and its effects on microstructure and properties.

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