Studies on indentation fracture toughness on ceramic and ceramic composite using acoustic emission technique

Ray, AK and Das, G and Mukhopadhyay, NK and Bhattacharya, DK and Dwarakadasa, ES and Parida, N (1999) Studies on indentation fracture toughness on ceramic and ceramic composite using acoustic emission technique. In: Bulletin of Materials Science, 22 (1). pp. 25-32.

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Abstract

This paper is aimed at investigating the acoustic emission activities during indentation toughness tests on an alumina based wear resistant ceramic and 25 wt% silicon carbide whisker (SIC,) reinforced alumina composite. It has been shown that the emitted acoustic emission signals characterize the crack growth during loading. and unloading cycles in an indentation test. The acoustic emission results indicate that in the case of the composite the amount of crack growth during unloading is higher than that of loading, while the reverse is true in case of the wear resistant ceramics. Acoustic emission activity observed in wear resistant ceramic is less than that in the case of composite. An attempt has been made to correlate the acoustic emission signals with crack growth during indentation test.

Item Type:	Journal Article
Publication:	Bulletin of Materials Science
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	SiC whisker;alumina;composite;wear resistant ceramic; acoustic emission;indentation fracture toughness.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	30 Jun 2011 07:16
Last Modified:	30 Jun 2011 07:16
URI:	http://eprints.iisc.ac.in/id/eprint/38810

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