Investigation on fatigue damage and failure mechanism of a plain-woven SiC/SiC composites at elevated temperatures based on acoustic emission.
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| Title: | Investigation on fatigue damage and failure mechanism of a plain-woven SiC/SiC composites at elevated temperatures based on acoustic emission. |
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| Authors: | Yan, Binglin1 (AUTHOR), Teng, Xuefeng1,2 (AUTHOR) tengxf0302@163.com, Jia, Jie3 (AUTHOR), Zeng, Qi4 (AUTHOR), Luo, Xiao4 (AUTHOR), Cao, Xueqiang5 (AUTHOR), Li, Qiufeng6 (AUTHOR), Li, Longbiao7 (AUTHOR), Hu, Xiaoan1,2 (AUTHOR) |
| Source: | Advanced Composite Materials. Dec2025, Vol. 34 Issue 6, p1153-1173. 21p. |
| Subjects: | Microcracks, Acoustic emission, High temperatures, Ceramic-matrix composites, K-means clustering, Fatigue cracks, Failure mode & effects analysis, Oxidation |
| Abstract: | The fatigue damage of fiber-reinforced ceramic matrix composites is characterized by the occurrence of multiple mechanisms in sequence and their interactions. The nonlinear stress-strain behavior is caused by micro-fracture events such as matrix cracking, fiber/matrix debonding, and fiber fracture. Clarifying damage types and their evolution process is of great significance for the optimization design of materials and accurate prediction of their mechanical behavior. In this paper, the tension-tension fatigue damage behavior of a plain-woven SiC/SiC composite was investigated via acoustic emission (AE) at elevated temperatures, unsupervised classification method was used to classify the damage mechanism, and quantitative analysis was carried out. The results showed that: Compared with 1200℃, the fatigue strength at 1350℃ is significantly reduced, and the fatigue life of SiC/SiC at high temperature is sensitive to temperature and stress; The damage types of SiC/SiC can be effectively identified, classified and quantified by K-means algorithm combined with AE amplitude and ringing count parameters; Based on the damage type and damage degree of the material, AE technology can also identify the fatigue damage stage of SiC/SiC material. Under high-temperature fatigue loading, the presence of microcracks and prolonged exposure to an air environment result in significant oxidation features on the crack surfaces of the specimen, the fiber pull-out lengths are relatively short, and some regions of the matrix show clear signs of melting. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The fatigue damage of fiber-reinforced ceramic matrix composites is characterized by the occurrence of multiple mechanisms in sequence and their interactions. The nonlinear stress-strain behavior is caused by micro-fracture events such as matrix cracking, fiber/matrix debonding, and fiber fracture. Clarifying damage types and their evolution process is of great significance for the optimization design of materials and accurate prediction of their mechanical behavior. In this paper, the tension-tension fatigue damage behavior of a plain-woven SiC/SiC composite was investigated via acoustic emission (AE) at elevated temperatures, unsupervised classification method was used to classify the damage mechanism, and quantitative analysis was carried out. The results showed that: Compared with 1200℃, the fatigue strength at 1350℃ is significantly reduced, and the fatigue life of SiC/SiC at high temperature is sensitive to temperature and stress; The damage types of SiC/SiC can be effectively identified, classified and quantified by K-means algorithm combined with AE amplitude and ringing count parameters; Based on the damage type and damage degree of the material, AE technology can also identify the fatigue damage stage of SiC/SiC material. Under high-temperature fatigue loading, the presence of microcracks and prolonged exposure to an air environment result in significant oxidation features on the crack surfaces of the specimen, the fiber pull-out lengths are relatively short, and some regions of the matrix show clear signs of melting. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09243046 |
| DOI: | 10.1080/09243046.2025.2464960 |
