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Compressive strength and damage mechanisms of 2D-C/SiC composites at high temperatures

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Abstract Compressive strength of 2D-C/SiC composite was investigated from room temperature(RT) to 1600 °C at present work. Damage evolution was investigated by conducting loading/unloading tests at RT and the damage mechanisms… Click to show full abstract

Abstract Compressive strength of 2D-C/SiC composite was investigated from room temperature(RT) to 1600 °C at present work. Damage evolution was investigated by conducting loading/unloading tests at RT and the damage mechanisms were elucidated by observing the fracture morphology. It is found that compressive strength of 2D-C/SiC was retained until 1200 °C and then decreased with increasing temperature. The variation of compressive strength is closely related to the degradation in matrix modulus. The compressive damage of 2D-C/SiC starts at the buckling of 0° fiber and is followed by opening and closing of original pores, initiation and growth of longitudinal interbundle cracks, separation of 90° fiber bundles by longitudinal cracks, matrix cracking from intrabundle pores, propagation of matrix cracks into 0° fiber bundles, connection of cracks in 0° fiber bundles and longitudinal cracks in 90° fiber bundles.

Keywords: fiber bundles; strength; compressive strength; cracks fiber; damage mechanisms

Journal Title: Ceramics International
Year Published: 2018

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