Model for uniaxial compaction of ceramic powders

A phenomenological yield criterion has been proposed for modelling the uniaxial compaction processes of various ceramic powder compacts on the basis of continuum mechanics. It includes three parameters to characterise the geometric hardening of the powder compact and the strength of the base material. The model was applied to uniaxial compaction of three ceramic powders which possess different particle size distribution, particle morphology, and base material property. The values of parameters in the yield criterion were determined through the uniaxial compaction experiment. Using the yield criterion, the elastoplastic finite element calculation was carried out to analyse the compaction of the three ceramic powders.