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Abstract
If shear stresses are present during isostatic pressing of a powder compact they may distort its shape, enhance densification, or both. A flow surface is required to predict these effects, but those available have been developed for highly consolidated, porous materials, not for less consolidated particulate materials. Since both are compressible media, flow surface is constructed using Beltrami's principle of constant total strain energy. This is applied in particular to particulate media, using a micromechanical model of densification which includes both void shape change and particle yielding and strain hardening. The theory agrees well with powder compact densification data for a wide variety of materials throughout the entire consolidation process. It is further compared with shape changes in copper compacts where shear stresses have been generated by the containment canister.
MST/1710
