Abstract
The motion of particle bed under shear stress has been numerically simulated using 3-Dimensional Distinct Element Method. The calculated results quantitatively well describe the stick-slip phenomena caused by the friction between a shear plate and particle bed. Homogeneous and closed configuration of contact particles in the friction plane is important for the prediction of stick-slip phenomena. The present results confirm that the motions governing these phenomena are particle rotations which suddenly arise the slip motion from the static stick state of the particle bed. The results also show that the close packed particles at stick state change to loose packed particles at the slip state due to the shear force. This phenomenon corresponds to the solid to liquid phase transition in the solid and the thin liquid film frictions.The friction loop calculated based on these results is fairly in good agreement with the measured data. The friction forces for example during the stick-slip can be correctly obtained using the friction coefficients along the friction loop.
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