Model for uniaxial compaction of ceramic powders

A phenomenological yield criterion has been proposed for modelling the unia xial compaction processes of various ceramic powder compacts on the basis o f continuum mechanics. It includes three parameters to characterise the geo metric hardening of the powder compact and the strength of the base materia l. The model was applied to uniaxial compaction of three ceramic powders wh ich possess different particle size distribution, particle morphology, and base material property. The values of parameters in the yield criterion wer e determined through the uniaxial compaction experiment. Using the yield cr iterion, the elastoplastic finite element calculation was carried out to an alyse the compaction of the three ceramic powders.