The effect of a rubber mold on densification and deformation of a metal powder compact during cold isostatic pressing

The effect of a rubber mold on densification behavior and deformation of an iron powder compact was investigated under cold isostatic pressing. The hyperelastic constitutive equations based on various strain energy potentials were employed to analyze deformation of rubber. The parameters in the strain energy potentials were obtained from experimental data for uniaxial tension, compression, and volumetric compression of natural rubber. The elastoplastic constitutive equation based on the yield function of Shima and Oyane was implemented into a finite element program (ABAQUS) to predict compaction responses of metal powder under cold isostatic pressing. Finite element results were compared with experimental data for densification and deformation of an iron powder compact under cold isostatic pressing.