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The Use of Signal Analysis to Identify Sources of Acoustic Emission

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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.
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Document Type: Research Article

Publication date: April 1, 1977

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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