Law of Sliding Friction
Force in Granular Materials
Xiao Wenbo,Hu Lin,Wu Yuqin
(Department of Physics, Guizhou University, Guiyang, 550025)
Abstract: Drawing a round rod immersed in
granular materials, the sliding friction force between the rod and granular materials are
measured. It is observed t hat the sliding friction force is distinctly different from
that between continu umsolid, but nonlinearly increases with the drag time. The power
spectrum analy sis reveals a relationship between power S(f) and frequency f, ie., S£¨f
£©¡Øf£1.80¡À0.05. It is explained with the model of
self-organized criticality that the continual avalanching and regrouping arise in the
granul ar materials under the outer disturbances.
Keywords: granular materials, sliding friction, power spectrum, self-organized
criticality.