Characteristics of Acoustic Emission Signals from Composites Graham, L. Elsley, R. 2018-02-13T16:46:07.000 2020-06-30T01:27:24Z 2020-06-30T01:27:24Z Sun Jan 01 00:00:00 UTC 1978 2013-10-31 1978-05-01
dc.description.abstract <p>Certain characteristics of acoustic emission (AE) signals from graphite-epoxy composite specimens were correlated last year with the mechanical behavior of the materials. Moisture degradation, which reduced the ultimate strength, resulted in a change in the AE amplitude distribution early in the loading history. Also, AE having distinct frequency spectral types tended to occur at or near singularities in the load curve. In order to transform those observations into a viable NDE tool, two things needed to be done: (1) develop a quicker and more objective method for extracting the pertinent correlations from the data, and (2) develop the statistical relationship between the AE characteristics and some mechanical strength parameter such as ultimate strength or remaining lifetime. The approach taken was to use computer pattern recognition techniques to analyze the data. A problem which was faced in this was the huge amount of data that are available in raw form from a single acoustic emission test. To reduce the amount of data, an intermediate feature extraction step was required and several ways of doing this, based on the prior work, were tried. As a result, the previous correlations between the acoustic emission signal characteristics and the mechanical condition of the composite were confirmed on a more objective basis. This now provides a tool for methodically studying and identifying the specific failure modes which occur in composite materials under various conditions.</p>
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dc.identifier archive/
dc.identifier.articleid 1036
dc.identifier.contextkey 4781467
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath cnde_yellowjackets_1977/33
dc.language.iso en
dc.relation.ispartofseries Interdisciplinary Program for Quantitative Flaw Definition Annual Reports
dc.source.bitstream archive/|||Fri Jan 14 23:37:22 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.keywords Nondestructive Evaluation
dc.title Characteristics of Acoustic Emission Signals from Composites
dc.type article
dc.type.genre 06_nde_for_advanced_materials
dspace.entity.type Publication
relation.isSeriesOfPublication 43920e40-d127-4f4c-9087-dc709815fe7f
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