EBEL, Andre; CATY, Olivier; REBILLAT, Francis

doi:10.1016/j.compositesa.2022.106899

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EBEL, Andre
Laboratoire des Composites Thermostructuraux [LCTS]

CATY, Olivier
Laboratoire des Composites Thermostructuraux [LCTS]

REBILLAT, Francis

Laboratoire des Composites Thermostructuraux [LCTS]

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Article de revue

Ce document a été publié dans

Composites Part A: Applied Science and Manufacturing. 2022-06, vol. 157

Résumé en anglais

Static fatigue tests at 100 MPa with unload-reload cycles were performed at 500, 550, 650 and 800 °C in air + 10 %vol·H2O on a self-healing ceramic matrix composite (SH-CMC) with a pyrocarbon interphase. The self-healing matrix was multi-layered and deposited by chemical vapor infiltration (CVI) based on the Si-B-C system. During static fatigue tests, damage was monitored during the tests with acoustic emission (AE) and electrical resistance (ER). AE demonstrated that crack initiation primarily takes place during loading for all test conditions. Evolution of ER, strain and modulus demonstrated that failure was primarily driven by interphase degradation at constant load due to unsealed cracks at temperatures below 550 °C. In these conditions, crack sealing is prevented by boria volatilization and interphase degradation takes place due to both interphase oxidation and recession of the boron carbide phase surrounding the interphase.< Réduire

Mots clés en anglais

Acoustic emission

Ceramic-matrix composites (CMCs)

Electrical resistivity

Environmental degradation

Fractography

URI

https://oskar-bordeaux.fr/handle/20.500.12278/171778

DOI

http://dx.doi.org/10.1016/j.compositesa.2022.106899

Project ANR

Composites Auto-Cicatrisants Virtuels pour la Propulsion Aéronautique - ANR-17-CE08-0030

Unités de recherche

Laboratoire des Composites Thermo Structuraux (LCTS) - UMR 5801