MECHANICAL BEHAVIOR OF POWDER PARTICLE ON THE APPLIED VIBRATION

Abstract

Powder is the popular state of material for the many parts of industries. In the powder metallurgy, it is important to know the powder behavior under applied stress for the accurate design and good quality assurance. But the mechanical behaviors of it has not been well known. We consider this is from the difficulty of handling powder numerically. To investigate the fundamental mechanism of powder behaviors, we performed experiment and numerical analysis for the powders on the applied vibration. In this experiment specimens of powder are on the vertical vibrator. And the dynamic location of powder particle are observed by a laser-displacement meter, at the same time dynamic flow of powder are observed by a high-speed video camera. From this experiment we found that the powder flow can be classified to several patterns and those patterns are strongly depending on the frequency and amplitude of applied vibration, particle size, and grain size distribution of the powder. In the numerical analysis we used the particle model. This calculation model refer to Cundall’s Distinct Element Method. We performed several numerical analysis on various conditions. From the result we considered the major parameter which determine the flowing pattern is the frictional conditions.