Journal
CERAMICS INTERNATIONAL
Volume 48, Issue 4, Pages 4699-4709Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.11.006
Keywords
Ceramic matrix composites; Digital image correlation; Acoustic emission; Proportional limit stress; Damage and failure analysis
Categories
Funding
- Postgraduate Innovation Special Fund Project of Jiangxi Province [YC2021-S684]
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This paper investigates the damage evolution and failure process of a SiCf/SiC CMC through DIC and AE methods. The results show that macro-matrix cracks and fiber fractures occur as different damage modes, affecting the AE energy signal. The significant increase in AE accumulated energy indicates severe internal damage, resulting in nonlinear macroscopic mechanical behavior.
The analysis of failure behaviors of continuous fiber-reinforced ceramic matrix composites (CMCs) requires the characterization of the damage evolution process. In service environments, CMCs exhibit complex damage mechanisms and failure modes, which are affected by constituent materials, meso architecture, inherent defects, and loading conditions. In this paper, the in-plane tensile mechanical behavior of a plain woven SiCf/SiC CMC was investigated, and damage evolution and failure process were studied in detail by digital image correlation (DIC) and acoustic emission (AE) methods. The results show that: the initiation of macro-matrix cracks have obvious local characteristic, and the propagation paths are periodically distributed on the material surface; different damage modes (matrix cracking and fiber fracture) would affect the AE energy signal and can be observed in real-time; the significant increase of AE accumulated energy indicates that serious damage occurs inside the material, and the macroscopic mechanical behavior exhibits nonlinear characteristic, which corresponds to the proportional limit stress (PLS) of the material.
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