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Abstract

As the origin of energy dissipation in rigid granular media is the frictional slippage between particles, we can easily detect the energy dissipation mechanism by knowing the statistics of the mobilized contact planes where the frictional slippages take place. In this paper, using a set of numerical test results obtained by granular element analyses, we discuss first the relationship between the work done by the external stress and the elastic and dissipative energies at internal contact points. Then, after explaining the method to identify the mobilized contact plane by dissipation levels, we show that a forth order tensor is inevitable to describe the statistical characteristics of the distribution of mobilized contact planes.