Acoustic harmonic generation at unbonded interfaces and fatigue cracks
作者:
O. Buck,
W. L. Morris,
J. M. Richardson,
期刊:
Applied Physics Letters
(AIP Available online 1978)
卷期:
Volume 33,
issue 5
页码: 371-373
ISSN:0003-6951
年代: 1978
DOI:10.1063/1.90399
出版商: AIP
数据来源: AIP
摘要:
The generation of a second‐harmonic signal at a flat unbonded interface between two solids has been observed. This signal is caused by passage of a longitudinal acoustic wave across the interface. The harmonic amplitude depends upon the pressure applied normal to the interface and is largest close to zero pressure, as expected theoretically. The effect has also been used to detect the presence of microcracks on the surface of Al 2024, developed during fatigue.
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