Abstract
The aim of this study is to develop a mathematical modeling of direct paste extrusion through a circular die going beyond the steady-state, where the coring point becomes evident. The proposed study considers a previous mathematical modeling of clay paste extrusion which did not consider the behavior beyond the steady-state. Therefore, it is proposed that the coefficient of friction is no longer constant after the steady-state. Moreover, beyond the coring point, two types of behavior can be noticed, an acceleration of the extrusion pressure decrease rate or an increase of the extrusion pressure. The latter behavior harms the ceramic industry since it can lead to die damage, lubrication problems, product defects and raise the production cost.
Highlights
There are few areas in technology in which development has met many application fields as extrusion
The Pferfferkorn’s plasticity index, Atterberg’s plasticity index, indentation, stress/strain curves, and rheological analysis are methods cited which aim to evaluate the plasticity of a ceramic [5]
Prior to verify the proposed mathematical modeling expressed in Eq 10, it is important to find the effective stress of the clay
Summary
There are few areas in technology in which development has met many application fields as extrusion. It was employed only for simple ceramic materials. Many studies are being conducted in this area focusing on producing advanced ceramics by extrusion. Examples such as ceramic honeycombs, high-Al2O3 ceramics for insulation, and aerospace components were pointed out by Händle [2]. The Pferfferkorn’s plasticity index, Atterberg’s plasticity index, indentation, stress/strain curves, and rheological analysis are methods cited which aim to evaluate the plasticity of a ceramic [5]
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