Caractérisation mécanique et modélisation thermodynamique du comportement anisotrope du polyéthylène à haute densité. Intégration des effets d'endommagement

Abstract : The aim of this thesis is to contribute to the knowledge of the mechanical behavior in large strains of anisotropic High Density PolyEthylene (HDPE), obtained by extrusion of plates. We present the experimental procedure and the results for traction, with unloading, reloading and relaxation in monotonous and cyclic conditions. This work is also concerned with the measure in real time of the volume strain due to the phenomena of damage. The results are given for various orientations of specimen within the extruded plates. The thermodynamic modeling of the whole the results, is the subject of an original development leading to the unified prediction of measures in 3D: axial true stress, transverse true strains. The model also predicts the development of the damage and offer the possibility to introduce a tensorial damage variable. The identification of the model parameters on the basis of experimental data leads to physical quantities in conformity with the characteristics of the microstructure. This work opens the prospect for an enrichment of the thermodynamic approach in the direction of the prediction of the induced plastic anisotropy of semi-crystalline polymers
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Rida Arieby. Caractérisation mécanique et modélisation thermodynamique du comportement anisotrope du polyéthylène à haute densité. Intégration des effets d'endommagement. Autre. Institut National Polytechnique de Lorraine, 2007. Français. ⟨NNT : 2007INPL085N⟩. ⟨tel-01752905⟩

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