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The motion of particles under the shear stress has been numerically simulated using 2-dimensional Distinct Element Method. The calculated results well describe the stick-slip phenomena caused by the friction in the particle bed. The results also show that the motions governed these phenomena are particle rotations which arise the slip motion from the static stick state of the particle bed. These motions of particle rotations are transmitted to the fairly deep inside area of the particle bed due to the particle-particle interaction.Based on these calculated results we also have obtained the friction loop which is qualitatively in good agreement with the data measured by Nasuno et al (Physical Review E, 58 Part B, 2161-2171 (1998)). However the calculated friction coefficient of particle bed is about 30% of measured value by Nasuno et al. The main cause seems to be the difference of the clearances between the cover plate particles and the bed particles from the real state in the powder bed.

Numerical Simulation for Friction Mechanism of Powder Bed Using 2-Dimensional Distinct Element Method