SYMPOSIA PAPER Published: 01 January 1991

Relationship between Acoustic Emission and Flaw Size in Si N Ceramics


Acoustic emission behavior was investigated in the Si3N4 ceramics in order to study the effect of flaw size on fracture strength. A close relation between the generation of acoustic emission and flaw size was found. It was found that acoustic emission signals can be detected only just before specimen failure with flaw size of 15 μm,1 a critical flaw size estimated for the materials, or larger. Whereas flaws smaller than 15 μm began to generate emissions at the stress level, approximately 50 % of the strength of the specimens failed. In the latter case, it was concluded that emissions were due to microscopic fracture events around inherent flaws.

Author Information

Mori, Y
Kishi, T
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Developed by Committee: E07
Pages: 242–251
DOI: 10.1520/STP19097S
ISBN-EB: 978-0-8031-5160-4
ISBN-13: 978-0-8031-1389-3