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Stress-wave attenuation in thin structures by ultrasonic through-transmissionThe steady-state amplitude of the output of an ultrasonic through-transmission measurement is analyzed and the result is given in closed form. Provided that the product of the input and output transduction ratios, the specimen-transducer reflection coefficient, the specimen-transducer phase-shift parameter, and the material phase velocity are known, this analysis gives a means for determining the through-thickness attenuation of an individual thin sample. Multiple stress-wave reflections are taken into account, and so signal echoes do not represent a difficulty. An example is presented for a graphite fiber epoxy composite (Hercules AS/3501-6). Thus, the technique provides a direct method for continuous or intermittent monitoring of through-thickness attenuation of plate structures which may be subject to service structural degradation.
Document ID
19820027336
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lee, S. S.
(Massachusetts Inst. of Tech. Cambridge, MA, United States)
Williams, J. H., Jr.
(MIT Cambridge, MA, United States)
Date Acquired
August 10, 2013
Publication Date
December 1, 1980
Publication Information
Publication: Journal of Nondestructive Evaluation
Volume: 1
Subject Category
Quality Assurance And Reliability
Accession Number
82A10871
Distribution Limits
Public
Copyright
Other

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