Fatigue crack propagation behavior at a notch for needled C/SiC composite under tension-tension loading

• Published in: Journal of mechanical science and technology Vol. 36; no. 1; pp. 167 - 177
• Main Authors: Hou, Geng, Shang, De-Guang, Zuo, Lin-Xuan, Qu, Lin-Feng, Xia, Ming, Guo, Yi-Er, Yin, Xiang, Wu, Shao-Dong
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 2022; Springer Nature B.V; 대한기계학회
• Subjects: Acoustic emission; Carbon-silicon carbide composites; Control; Crack propagation; Cyclic loads; Dynamical Systems; Emission analysis; Engineering; Failure analysis; Fatigue failure; Fatigue strength; Fatigue tests; Industrial and Production Engineering; Mechanical Engineering; Original Article; Propagation; Vibration; 기계공학; Fatigue resistance; Needled C/SiC composite; Fiber bundle distribution; Notch; Fatigue crack
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-021-1215-7

Fatigue test of a needled C/SiC composite with a notch under tension-tension cyclic loading was completed, and the main fatigue crack propagation curve of the needled composite was obtained by the in situ observation of the fatigue process. By analyzing the influence of the failure number and distribution on the tensile loading subjected by 0° fiber bundles, the relationship between the main fatigue crack propagation and the distribution of 0° fiber bundles in the needled composite was established. By observing the fracture microstructure (especially the distribution of 0° fiber bundles) of the needled composite through scanning electron microscopy, the reasons for the varying fatigue resistance of different notched specimens were also explained. In addition, acoustic emission (AE) was also used to analyze the AE energy characteristics during the fatigue crack propagation process of the needled composite.