Abstract:Equivalent yield strength of sintered powder materials is determined by experiments, and the following yield condition is constructed based on it. Experiments on uniaxial compression, and plane strain, closed die upsetting have been done using sintered copper, and the relation between the deformation resistance and compactness of the prefabricated preform is analysed. A design principle for the prefabricated preform density is proposed, and the effectiveness of shear plastic deformation to densification is pointed out.

Key words:   sintered materials  plasticity theory  densification