粒状体の粒子間摩擦Φμの測定に関する研究

概要

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The experimental measurement of the true friction angle between stainless steel spheres using direct shear test apparatus was performed. The spheres were fixedly attached to the shear boxes not to allow any rotation, and horizontal and vertical displacement and shear force were measured at the certain normal load. The value of stress ratio τ/σ was computed and plotted versus dimensionless horizontal displacement (u_s/d) from the experimental results. Dimensionless vertical displacement (u_v/d) was also plotted on the same graph. The friction angle between stainless steel spheres was determined by fitting the theoretical curve, which derived by Matsuoka, on the plots of experimental results. Labolatory measurements gave some intersting results : 1) Matsuoka's method of measuring friction angle of particulate material which was developped for two dimensional rods is not suitable for three dimensional spheres in terms of contact area changing; 2) the magnitude of friction angle is propotional to the relative humidity; 3) friction angel is not constant to the normal load that means the basic laws of friction is no longer valuable in this condition : Taking into account of the high contact stresses cause the elastic deformation of spheres, the magnitude of friction angle of stainless steel was found to be around 18 degree.
神戸大学の論文
1993-01-30