The yield behaviour of metal powders

Copper powders have been densified by cold hydrostatic compaction and by cold closed-die compaction. The stress versus strain relations were measured and the subsequent yield surfaces were probed. The shape of the yield surface is found to be sensitive to the type of compaction employed. Hydrostatic...

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Bibliographic Details
Published in:International journal of mechanical sciences 1997-12, Vol.39 (12), p.1315-1324
Main Authors: Akisanya, A.R., Cocks, A.C.F., Fleck, N.A.
Format: Article
Language:English
Subjects:
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
powder compaction
triaxial tests
yield surfaces
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Summary:Copper powders have been densified by cold hydrostatic compaction and by cold closed-die compaction. The stress versus strain relations were measured and the subsequent yield surfaces were probed. The shape of the yield surface is found to be sensitive to the type of compaction employed. Hydrostatic compaction results in a yield surface of approximately elliptical shape, while closed-die compaction produces a yield surface which is elongated along the loading direction with a vertex at the loading point. Existing theories of cold compaction are compared against the observed responses.
ISSN:0020-7403
1879-2162
DOI:10.1016/S0020-7403(97)00018-0