Modélisation du mélange de polymères chargés et de la casse de fibres rigides en extrusion bivis

Abstract : In this thesis, we have attempted to use and to extend previously developed simulation tools to propose characterisation and mixing prediction methods at different scales. At a local macroscopic flow scale, we attempted to use the possibilities given by the 3D finite element software XimeX® and to improve it in order to obtain a tool for mixing simulation of filled polymers in twin-screw extruders. Thus we have enriched the existing finite element method using the Cemef finite element library CimLib© in order to achieve a greater computation accuracy. Then we have tested several particle tracking methods to predict the fillers displacement into the matrix during mixing. Furthermore, we have applied several characterisation methods to these particles tracking results for different screw geometries. At the particle scale, we have focused on the mechanisms leading to rigid fibres (such as glass fibres) breakage during mixing with polymer in twin-screw extruders. We have some assumptions in order to simplify this extremely complex problem. We then have proposed a simulation method of the evolution of the fibres length distribution along the flow. This method is based on the fibres mass conservation. We have used the results of the Ludovic® software 1D computations based on lubrication theory as impute parameters for this simulation. Then we have compared some computational results to length distributions measured on experimental samples taken along a twin-screw extruder.
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Audrey Durin. Modélisation du mélange de polymères chargés et de la casse de fibres rigides en extrusion bivis. Autre. Ecole Nationale Supérieure des Mines de Paris, 2012. Français. ⟨NNT : 2012ENMP0005⟩. ⟨pastel-00687658⟩

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