A densification model for mixed metal powder under cold compaction |
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Authors: | K T Kim J H Cho |
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Affiliation: | Department of Mechanical Engineering, Pohang University of Science and Technology, San 31 Hyoja-dong, Nam-ku, Pohang 790-784, South Korea |
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Abstract: | Densification behavior of mixed copper and tool steel powder under cold compaction was investigated. By mixing the yield functions proposed by Fleck et al. and by Gurson for pure powder in terms of volume fractions of Cu powder and the fraction of contact, a new mixed yield function was employed for densification of powder composites under cold compaction. The constitutive equations were implemented into a finite element program (ABAQUS) to compare with experimental data and with results from the model of Kim et al. for densification of mixed powder under cold isostatic pressing and die compaction. Finite element calculations by using the yield functions mixed by the fraction of contact agreed better than those by volume fractions of Cu powder with experimental data. |
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Keywords: | Cold isostatic pressing Cold die compaction Constitutive equation Densification Finite element analysis Mixed metal powder Yield function |
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