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Studies on indentation fracture toughness on ceramic and ceramic composite using acoustic emission technique
A K Ray G Das N K Mukhopadhyay D K Bhattacharya E S Dwarakadasa N Parida
Mechanical Properties Volume 22 Issue 1 February 1999 pp 25-32
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https://www.ias.ac.in/article/fulltext/boms/022/01/0025-0032 -
Keywords
SiC whisker ;alumina ;composite ;wear resistant ceramic ;acoustic emission ;indentation fracture toughness -
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 (SiCw) 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.
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Author Affiliations
A K Ray1 G Das1 N K Mukhopadhyay1 2 D K Bhattacharya1 E S Dwarakadasa1 3 N Parida1
- National Metallurgical Laboratory, Jamshedpur - 831 007, India
- Department of Metallurgy, Institute of Technology, Banaras Hindu University, Varanasi - 221 005, India
- Department of Metallurgy, Indian Institute of Science, Bangalore - 560 012, India
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Dates
- Published
- February 1999
- Manuscript received
- 18 July 1998
- Manuscript revised
- 23 November 1998
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