@article {Woodward:1977:1610-1928:190,
title = "The Use of Signal Analysis to Identify Sources of Acoustic Emission",
journal = "Acta Acustica united with Acustica",
parent_itemid = "infobike://dav/aaua",
publishercode ="dav",
year = "1977",
volume = "37",
number = "3",
publication date ="1977-04-01T00:00:00",
pages = "190-197",
itemtype = "ARTICLE",
issn = "1610-1928",
url = "https://www.ingentaconnect.com/content/dav/aaua/1977/00000037/00000003/art00010",
author = "Woodward, B. and Harris, R. W.",
abstract = "Acoustic emission occurs in a metal when an applied stress causas movement of flaws. The magnitude and frequency content of each emission burst generated depend on the nature of some source mechanism, and provided the characteristics of the propagation path between the
source and a detecting transducer are definable and substantially constant an analysis of individual bursts should allow the various source mechanisms to be identified. The analysis procedure chosen was to obtain the amplitude spectral density for each burst and to characterise this by computing
a single parameter, the median frequency, i.e. the frequency which divides the spectrum into two equal areas.A series of experiments was carried out using zirconium specimens, and the experimental results indicated that three separate metallurgical mechanisms produced acoustic emissions.
The results also indicated that one of these mechanisms was dominant. A concurrent metallurgical examination showed that a large amount of twin initiation took place and that there were smaller amounts of twin broadening and slip.",
}