2000 年 52 巻 4 号 p. 417-424
A many-body disk model of slip phenomena was investigated by carrying out a model experiment. A two dimensional many-body disk system was used as a model of the boundary layer between slip surfaces. A model experiment with a packing fraction of 0.75 was carried out at a constant rotation rate of 1/80Hz (angular frequency). The time series of torque was measured during the experiment. By analyzing five thousand seconds' time series of torque, 1784 stick-slip events were obtained. We found that the size distribution of stick-slip events obeys a power law, N(s)-s-a, where s is a size of stick-slip events and N(s) is the number of stick-slip events of which size is s. The value of α calculated by the least squares method is 0.93±0.07 (s. d.). The power law size distribution suggests that the many-body disk model of slip phenomena is a self-organized critical phenomenon.