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Vol.38, No.6, 817 ~ 823, 2000
Title
Pesearch Paper / Powder Metallurgy : Densification of Powder Compacts using a Unified Viscoplastic Constitutive Model
김형섭Hyoung Seop Kim
Abstract
A model for densification of metallic powders is proposed. It involves viscoplastic constitutive equations based on dislocation density evolution and also accounts for an effect of porosity. The model was applied to the case of cold powder compaction under uniaxial compression conditions. Densification behaviour during powder compaction was simulated using an explicit integration method as applied to the dislocation density evolution and the variation of the relative density of the compact. The model was gauged by comparing the experimental data generated by cylindrical die compaction tests on Cu powder with the simulation results. The model accounts for the grain size and the deformation rate dependence of on the densification process.
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