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Modélisation multi échelle du comportement thermomécanique des bétons incluant des matériaux à changement de phase micro encapsulés

Abstract : A promising way to enhance thermal inertia of buildings is the use of phase change materials (PCMs). Thanks to their high latent heat, PCMs can be used to store a significant amount of thermal energy in order to reduce energy consumption related to air conditioning. However, their use leads to a decrease in the mechanical strength of the obtained composites. During the last decades, the incorporation of PCMs in concrete has been of great interest leading to many experimental works. However, theoretical and numerical models to predict the behavior of such complex materials are not developed so far, due to the complexity of the phase change behavior, the scale separation and issues associated to the damage which is mainly induced by microcracking at the scale of microstructural heterogeneities. The objective of this thesis is precisely to develop numerical modeling tools to predict the effective thermomechanical behavior of the material with aim of structural calculations. For this purpose, numerical tools based on microstructures at the scale of microencapsulated PCM are developed to simulate heat transfer, mechanical response, cracks propagation as well as leakage of liquid PCM through cracks. After studying the effects of phase changes in the PCM on the effective mechanical response of the composites, a multi-scale approach (FE² method) is proposed to carry out structural calculations taking into account phenomena at micro scale. Thermo-physical experimental characterizations are carried out to show the usefulness of PCMs in building materials and to make comparisons with the developed homogenization tools. Finally, we propose a study to understand and evaluate the effects of PCMs in the degradation of the mechanical properties of these new materials
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Jérôme Kodjo. Modélisation multi échelle du comportement thermomécanique des bétons incluant des matériaux à changement de phase micro encapsulés. Matériaux. Université Paris-Est, 2019. Français. ⟨NNT : 2019PESC2010⟩. ⟨tel-02390520⟩

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