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Modélisation des relations microstructure - propriétés de matériaux réfractaire : approche micromécanique par la méthode des éléments discrets

Abstract : The present thesis aimed at investigating the relationships between the microstructure of refractories and their thermomechanical properties in order to increase their thermal shock resistance. In particular, numerical modeling were carried out in order to better understand the design of microstructure involving damages due to thermal expansion mismatch during processing. For this purpose, experimental results on simplified materials were used as reference for this numerical approach. In order to obtain quantitative results of complex phenomena, new developments of an existing discrete element modeling platform, namely GranOO, were carried out. More specifically, direct calibration method of input parameters and improvement of virial stress concept were proposed. This DEM approach was then applied to reproduce thermal damages during cooling of simplified materials and to examine their effects on macroscopic properties. The obtained DEM results of evolution of Young’s modulus and thermal expansion coefficient as a function of temperature exhibited similar tendencies with experimental results
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Truong Thi Nguyen. Modélisation des relations microstructure - propriétés de matériaux réfractaire : approche micromécanique par la méthode des éléments discrets. Matériaux. Université de Limoges, 2019. Français. ⟨NNT : 2019LIMO0089⟩. ⟨tel-02464585v2⟩

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