Dynamic Observation of Fracture Process in a Silicon Carbide- Matrix Laminated Ceramic Composite

Abstract:

The dynamic process of crack initiation and propagation in a SiC/BN-Al2O3 laminated composite was observed in situ by scanning electron microscopy. During a bending test with a single-edge notched-beam specimen, an interfacial crack first initiated in the interlayer near the notch tip, after which a through-thickness crack formed in the matrix layer at the notch tip. After the through-thickness crack had grown across the first matrix layer, it was deflected by the next interlayer and again became an interfacial crack. Interfacial cracks and through-thickness cracks were generated alternately until the composite failed. The load-displacement plot of the laminated composite exhibited several peaks, each caused by one propagation of a through-thickness crack. The toughening mechanisms of the laminated composite included crack deflection, interfacial cracking, and through-thickness branch cracking.

• Periodical: Key Engineering Materials (Volumes 368-372)
• Pages: 1847-1850
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.368-372.1847
• Online since: February 2008
• Authors: Yang Zhou, Guang Jiang Yuan, Jian Feng Tong, Lin Hu Du, Da Ming Chen, Hong Xiang Zhai
• Keywords: Fracture, In Situ Observation, Laminated Composite, Silicon Carbide (SiC)

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