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Communication Dans Un Congrès Année : 2012

Numerical simulations of clay tiles compression

Fabrice Schmidt
Gilles Dusserre
Olivier de Almeida

Résumé

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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Dates et versions

hal-01687321 , version 1 (06-03-2019)

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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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