Acoustic emission (AE) is the sound waves produced when a material undergoes stress (internal change), as a result of an external force. AE is a phenomenon occurring in for instance mechanical loading generating sources of elastic waves. This occurrence is the result of a small surface displacement of a material produced due to stress waves genera...
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http://en.wikipedia.org/wiki/Acoustic_emission
(from the article `ultrasonics`) Structural flaws in materials can also be studied by subjecting the materials to stress and looking for acoustic emissions as the materials are ...
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http://www.britannica.com/eb/a-z/a/13
A measure of integrity of a material determined by sound emission when a material is stressed. Sometimes these sounds are audible such as wood cracking or rock particles abrading against one another. More often the acoustic emissions are not audible, due to their low amplitude or high frequency, or both.For rolling element bearing analysis, it is t...
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https://www.encyclo.co.uk/local/20687
Acoustic emissions are sound or ultrasound pulses generated during crack initiation or propagation in materials and coatings as a result of being subjected to stress. Acoustic emissions can be detected by transducers.
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https://www.encyclo.co.uk/local/20828
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