Influence of internal defects on filament wound SiC/SiC composite tubes on their mechanical behavior under uniaxial tension - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the European Ceramic Society Année : 2022

Influence of internal defects on filament wound SiC/SiC composite tubes on their mechanical behavior under uniaxial tension

Résumé

SiC/SiC composites are resistant to high temperatures making them excellent candidates for aeronautical or nuclear applications. The paper examines the robustness of the mechanical behavior of SiC/SiC tubes for fuel cladding in pressurized light water reactors. For this purpose monotonous tensile tests with loading-unloading cycles are carried on a serie of SiC/SiC tubes having standard dimensions and structural characteristics. They were made by chemical vapor infiltration (CVI) of the matrix into a wound fiber preform. The loading direction was parallel to the tube axis, and the fibers were oriented to ±45°with respect to the tube axis. The tensile behavior is analyzed regarding the tube as a unidirectional structure reinforced by the fiber preform. The tensile behavior exhibits the conventional non linear deformations investigated in earlier works on dog bone specimens of SiC/SiC composite. The contribution of debonded interfaces in the vicinity of matrix cracks was determined from the loading-unloading loops. Two families of tubes were differentiated from features of the stress-strain behavior. The specimens of the second family displayed a decreased elastic modulus, slower rate of shear damage and premature saturation of slippage at fiber/matrix interface cracks. Various causes including the presence of free Si in the SiC matrix, the presence of seal coating, differences in local dimensions, arrangement of constituents, porosity, and cracks were examined.

Domaines

Matériaux
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Dates et versions

hal-03797626 , version 1 (04-10-2022)

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C Morel, E Baranger, J Lamon, J Braun, C Lorrette. Influence of internal defects on filament wound SiC/SiC composite tubes on their mechanical behavior under uniaxial tension. Journal of the European Ceramic Society, In press, ⟨10.1016/j.jeurceramsoc.2022.12.040⟩. ⟨hal-03797626⟩
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