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

被引：1

作者：

LEMAITRE, P ^{[1
]}

BUGLINO, V ^{[1
]}

LAKESTANI, F ^{[1
]}

DENIS, R ^{[1
]}

机构：

[1] UNIV PALERMO,DIPARTIMENTO MECCAN & AERONAUT,I-90128 PALERMO,ITALY

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 1993年 / 12卷 / 01期

关键词：

D O I：

10.1016/0955-2219(93)90067-2

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The detection, imaging and characterisation of radial cracks, resulting from Vickers indentations in a sintered reaction-bonded silicon nitride, are studied by means of ultrasonic leaky Rayleigh waves. The depth of the cracks investigated varied between 40 and 270 mum. Focusing probes 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 acoustic methods. The detection and sizing limits are discussed.

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页码：15 / 25

页数：11

共 27 条

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