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Theses

Modélisation multi-échelles des propriétés élastiques du composite argile-pailles de riz

Abstract : With the evolution of humanity, modern constructions are proposed based on conventional materials. This is not without consequence because today the construction sector is the largest consumer of energy and the second emitter of CO2 in the world. This significantly impacts the climate of the planet. It is therefore essential today to develop materials that best respect the environment through their low greenhouse gas emission power and which consume little energy. This research is part of this process, which will contribute to the development of ecological materials for construction. We are interested in studying the elastic properties of a clay matrix composite, reinforced with vegetable rice straws. In view of the results obtained, it is shown that this material used in a traditional way in rural areas has interesting characteristics, which constitute reasons for its popularization with builders. The experimental tests in conjunction with the microstructural study made it possible to better control not only the distribution of the fibres in the matrix, but also to define the optimal formulation. The variation in the volume fraction of straws allows us to highlight the influence of straws on the earth material. Straws play the role of reinforcements in the clay-rice straw composite material (banco). They improve the tensile and compressive strength up to a threshold of 25% by volume proportion. It appeared that the Young's modulus decreases with the evolution of the volume fraction and that its greatest value is obtained when the volume fraction is 25%. Multi-scale modelling for the prediction of the elastic behaviour of the banco composite was carried out in this work, through the analytical models of Mori-Tanaka, Hashin-Strikman, the bounds of Voigt and Reuss. A numerical study was made using the Digimat software, of which the finite element module and the MF semianalytical module were used. The study of the behaviour of the material was carried out only in elasticity. Using these models, we were able to go back to the intrinsic properties of the constituents of the composite (the elastic properties of rice straws and the clay matrix, the aspect ratio of rice straws, the geometric orientation of inclusions, the volume fraction of inclusions). We have noticed that the Mori-Tanaka models and the Digimat MF model best predict the elastic behaviour of the clay-rice straw composite.
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http://docnum.univ-lorraine.fr/ulprive/DDOC_T_2020_0067_ADADJA.pdf
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https://hal.univ-lorraine.fr/tel-02958887
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Submitted on : Tuesday, October 6, 2020 - 12:21:39 PM
Last modification on : Wednesday, October 7, 2020 - 3:34:18 AM

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  • HAL Id : tel-02958887, version 1

Citation

Christian Enagnon Adadja. Modélisation multi-échelles des propriétés élastiques du composite argile-pailles de riz. Mécanique des matériaux [physics.class-ph]. Université de Lorraine; Université d'Abomey-Calavi (Bénin), 2020. Français. ⟨NNT : 2020LORR0067⟩. ⟨tel-02958887⟩

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