NUMERICAL MODELING OF THE COMPACTION OF POWDER ARTICLES OF COMPLEX SHAPE IN RIGID DIES: EFFECT OF PRESSING METHOD ON DENSITY DISTRIBUTION 1. MECHANICAL MODEL OF POWDER DENSIFICATION

摘要

A theory of plasticity of a porous body was formulated taking into account the specifics of powder behavior under pressing. The proposed model of the material under compression is one-parameter with all functions depending on the current density. In order to determine the parameters of the model, use was made of the equilibrium density attained during the compression of an unbonded powder body, that value of density beyond which further deformation is not accompanied by volume change. Methods for determining the material parameters of the model are described.