Three Method comparison used for calibration of Drucker-Prager Cap constitutive model for ceramic powder compaction
Résumé
The reference ceramic fabrication process behave three main stages, grinding, pressing and sintering. The kinematic powder compaction process during pressing stage is decomposed into loading, unloading and ejection of the pellet outside the die. The finite element method (FEM) has received considerable attention for simulating powder compaction and sintering [1]. FEM is a numerical tool that enables to solve the partial differential equations of the mechanics of a continuous media. Applied to powder forming processes, such as compaction and sintering, FEM uses elasto-plastic or visco-plastic models as constitutive equations. In this study, we used the modified Drucker-Prager Cap (DPC) model implemented in commercial AbaqusDS software. DPC model is based on load surface which is decomposed of Cap plasticity and cap hardening. The porous elastic is incuded in the model. In order to reduce powder quantities and optimize characterization model process, three modelling methods have been set on competition for simulate by FEM the pellet fabrication with a good agreement with manufacturing criteria.
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