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

Abstract:

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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.

Info:

Periodical:

Key Engineering Materials (Volumes 368-372)

Edited by:

Wei Pan and Jianghong Gong

Pages:

1847-1850

DOI:

10.4028/www.scientific.net/KEM.368-372.1847

Citation:

Y. Zhou et al., "Dynamic Observation of Fracture Process in a Silicon Carbide- Matrix Laminated Ceramic Composite", Key Engineering Materials, Vols. 368-372, pp. 1847-1850, 2008

Online since:

February 2008

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Price:

$35.00

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