Numerical simulations of clay tiles compression

Abstract : During the pressing step, the clay tiles undergo stresses which result in the appearance of defects. A rheological study, based on free compression tests, allowed to confirm the Elasto-visco-plastic behaviour of the clay. The different constitutive parameters were estimated by fitting the force-displacement experimental curves using the optimisation algorithm (ES Metamodel) implanted in the commercial software Forge 2009 (R). The influence of the tribological parameters was studied using squeezing numerical simulations of a full tile. The numerical model was validated with experimental squeezing test of technological specimen with a tile lug. Then, we have compared experimental force with the numerical one and deduced that the clay/tool interface is not perfectly sliding. A friction Tresca's law was used to model the clay/tool interface. Numerical results showed that the actual geometry of tile lug didn't allow to form correctly the tile. Several areas undergo tensile stress, air traps,. .. A new geometry of tile lug was proposed in order to limit this phenomenon. Using a simplified defect criteria (Latham and Cockroft), the numerical model allowed to locate the areas where there is a risk of crack.
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Jérémie Vignes, Fabrice Schmidt, Gilles Dusserre, Olivier de Almeida, Jean Frederic Dalmasso. Numerical simulations of clay tiles compression. ESAFORM 2012 - 15th International ESAFORM Conference on material forming, Mar 2012, Erlangen, Germany. pp.1403-1408, ⟨10.4028/www.scientific.net/KEM.504-506.1403⟩. ⟨hal-01687321⟩

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