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The movement of particles and a change of internal stress in the beds of an atomized copper powder wat followed under a random vibration (6-180Hz) with a small amplitude and under a vibrationless state on a bibration proof stage by visual inspection and by measuring the static wall pressure.The internal stress in standing beds decreases with standing time. Two types of particle movements were observed in the deposition beds: the one was massive displacement, the so called settling phenomenon, and the other was random displacements of particles into the nearest void space. The latter was always observed the powders of 67.5-125.5μm in mean particle diameter.The flow-patterns in the discharge of the powder from a cylindrical tets bin changed with standing time:1. mass-flow immediately after the filling; 2. plug-flow after longer standing time (more than 30 minetes); 3. trasient type at medium standing time.A connection between the variation of flow-pattern and the change in the internal stress due to random displacement of individual particles is discussed.
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