Fracture toughness of 2-D woven SiC/SiC CVI-composites with multilayered interphases
- Domaine Univ., Pessac (France). Lab. des Composites Thermostructuraux
Relations between fracture toughness and fiber/matrix interphases were examined on various SiC/SiC composites made by chemical vapor infiltration (CVI) and reinforced with woven fiber bundles. Strong and weak fiber/matrix bondings were obtained using multilayered interphases consisting of various combinations of carbon and SiC layers of different thickness and using fibers which had been previously treated. Fracture toughness was estimated using the J-integral and using strain energy release rate computed with a model taking into account the presence of a process zone of matrix microcracks. Both approaches evidenced similar trends. It appeared that higher toughness was obtained with those composites possessing strong interphases and subject to dense matrix microcracking.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 247904
- Journal Information:
- Journal of the American Ceramic Society, Vol. 79, Issue 4; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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