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A potential means of using acoustic emission for crack detection under cyclic-load conditions.A preliminary investigation was conducted to assess the feasibility of monitoring acoustic emission signals from fatigue cracks during cyclic bend tests. Plate specimens of 6Al-4V titanium, 2219-T87 aluminum, and 18-Ni maraging steel were tested with and without crack starter notches. It was found that significant acoustic emission signals could be detected in the frequency range from 100 to 400 kHz. Cracks emanating from starter notches were monitored by the ultrasonic pulse-echo technique and periodically measured by micro-optical examination. The investigation indicated that it was possible to extract meaningful acoustic emission signals in a cyclic bend machine environment.
Document ID
19730044599
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vary, A.
Klima, S. J.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 7, 2013
Publication Date
April 1, 1973
Subject Category
Structural Mechanics
Meeting Information
Meeting: Symposium on Nondestructive Evaluation
Location: San Antonio, TX
Start Date: April 25, 1973
End Date: April 27, 1973
Accession Number
73A29401
Distribution Limits
Public
Copyright
Other

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