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Étude des endommagements sur CMC par une approche de modélisation micro-méso alimentée par des essais in situ

Abstract : SiC/SiC composites display excellent thermomechanical properties at high temperatures. They appear as promising candidates to replace metallic alloys in hot parts of aircraft engines to reduce their environmental impact. Thus, to understand and to predict the onset of damage in such materials is critical. An integrated multi-scale approach is developed to construct numerical models that integrate the specificities of the material at the di↵erent relevant scales. This work is twofold : an experimental characterization of the damage, and finite element modeling at the microscopic and mesoscopic scales. In situ tensile tests are carried out under microscopes and X-ray micro-tomography (μCT). Images are analyzed to visualize and quantify the damage mechanisms at scales consistent with the numerical models. Based on these observations, damage calculations are performed at the microscopic scale to simulate the transverse yarns cracking. Virtual tests are then used to identify damage laws at the upper scale and to simulate the first cracks in 3D woven composites at the mesoscopic scale. Through these simulations, we highlight the links between the organization of the material at di↵erent scales and the initiation of the damages. Comparisons between experiments and calculations are finally performed. In particular, the predicted damage events are compared to those obtained experimentally on the same specimen during in situ μCT tensile tests.
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  • HAL Id : tel-02081160, version 1

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Vincent Mazars. Étude des endommagements sur CMC par une approche de modélisation micro-méso alimentée par des essais in situ. Matériaux. Université de Bordeaux, 2018. Français. ⟨NNT : 2018BORD0251⟩. ⟨tel-02081160v1⟩

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