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Automatisation de la modélisation numérique des microstructures de matériaux hétérogènes basée sur une intégration CAO-calcul

Abstract : Numerical simulation of heterogeneous materials is of great interest to the scientific community since it is an attractive and economical solution to the problem of characterizing the thermomechanical behavior of heterogeneous materials. Heterogeneous materials behavior is difficult to predict even when the constituents properties are known and their shape and position well defined. This difficulty is related to the physical phenomena that occur at the constituents scale. They originate from the constituents interaction and the way they are assembled together. Numerical modeling of heterogeneous materials can simulate samples of the material to be studied. These samples are the Statistical Volume Elements (SVE) and represent a portion of the material microstructure. To obtain a statistical representation of the thermomechanical behavior, it is usually necessary to generate many SVE. This thesis objective is to propose a new automated approach to numerical modeling of microstructures based on the integration of Computer Aided Design (CAD) methods, automatic mesh generation methods and Finite Element Analysis (FEA) method. This approach is proposed in the context of heterogeneous particulate materials but can be applied to all types of microstructures. The potential of the CAD-FEA integrated approach is illustrated with a comparative study of the influence of the constituents shape and the mesh degree on the apparent thermomechanical properties of a glass / epoxy composite. An innovative method for generating microstructures with high volume fractions of slender particles is introduced. This new method is used to simulate the behavior of a hemp and cement composite and the numerical results are confronted with the experimental results.
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Adrien Couture. Automatisation de la modélisation numérique des microstructures de matériaux hétérogènes basée sur une intégration CAO-calcul. Matériaux. Université de Bretagne Sud; Université du Québec à Trois-Rivières, 2019. Français. ⟨NNT : 2019LORIS543⟩. ⟨tel-02886124⟩

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