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Correlation of the deply technique with ultrasonic imaging of impact damage in graphite-epoxy compositesThe ultrasonic quantitative NDE of graphite-epoxy composites is difficult because of the inherent inhomogeneity of the material. An examination technique must discriminate between inherent scattering centers in an undamaged region and the scattering centers due to defects or damage. Two NDE techniques that can make this distinction were used to image and quantify the extent of damage resulting from a low-energy impact. These results were then compared with those from a destructive technique. The first NDE technique, polar backscatter, employed a nonzero polar angle insonifying method to reduce specular reflection from the surface of the sample; the second NDE technique used a normal-incidence ultrasonic beam. Results from both NDE methods were subsequently correlated with those from a destructive technique, the deply method. Both the qualitative and quantitative agreement of the methods was excellent.
Document ID
19900030966
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Smith, B. T.
(Christopher Newport College Newport News, VA, United States)
Heyman, J. S.
(Christopher Newport Coll. Newport News, VA, United States)
Buoncristiani, A. M.
(NASA Langley Research Center Hampton, VA, United States)
Blodgett, E. D.
(Wisconsin, University River Falls, United States)
Miller, J. G.
(Washington University Saint Louis, MO, United States)
Date Acquired
August 14, 2013
Publication Date
December 1, 1989
Publication Information
Publication: Materials Evaluation
Volume: 47
ISSN: 0025-5327
Subject Category
Quality Assurance And Reliability
Accession Number
90A18021
Funding Number(s)
CONTRACT_GRANT: NAG1-1601
CONTRACT_GRANT: NAG1-431
Distribution Limits
Public
Copyright
Other

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