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Characterization of the porosity-pressure relation of cohesionless powders

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An experimental investigation is presented of the effect of the particle size distribution on the compaction of cohesionless powders. It is demonstrated that the densification of a powder during compaction may be treated as a (pseudo-) rate process, and the porosity-pressure relation can be described by a simple and general equation. The results indicate that particle size distribution plays an important role in quantifying the porosity-pressure relation, though this relation may be dominated by the mechanical properties of powders at high pressures. A possible method of predicting the relationship between porosity and particle size distribution and pressure is also discussed.

Affiliations: 1: School of Materials Science and Engineering, The University of New South Wales, PO Box 1, Kensington, NSW 2033, Australia; 2: Department of Mechanical Engineering, The University of Wollongong, PO Box 1144, Wollongong, NSW 2500, Australia


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