ULTRASONIC-IMAGING AND CHARACTERIZATION OF SURFACE-BREAKING CRACKS INSILICON-NITRIDE BY LEAKY RAYLEIGH-WAVES

Authors
LEMAITRE P BUGLINO V LAKESTANI F DENIS R
Citation
P. Lemaitre et al., ULTRASONIC-IMAGING AND CHARACTERIZATION OF SURFACE-BREAKING CRACKS INSILICON-NITRIDE BY LEAKY RAYLEIGH-WAVES, Journal of the European Ceramic Society, 12(1), 1993, pp. 15-25
Citations number
28
Categorie Soggetti
Material Science, Ceramics
Journal title
Journal of the European Ceramic Society → ACNP
ISSN journal
09552219
Volume
12
Issue
1
Year of publication
1993
Pages
15 - 25
Database
ISI
SICI code
0955-2219(1993)12:1<15:UACOSC>2.0.ZU;2-Q
Abstract
The detection, imaging and characterisation of radial cracks, resultin g from Vickers indentations in a sintered reaction-bonded silicon nitr ide, are studied by means of ultrasonic leaky Rayleigh waves. The dept h of the cracks investigated varied between 40 and 270 mum. Focusing p robes with a nominal frequency of 30 and 75 MHz are used. The obtained C-scan images, which are complicated by the presence of the indents, are discussed. Crack length and crack depth are measured using acousti c methods. The detection and sizing limits are discussed.