Topic
Acoustic emission
About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.
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TL;DR: In this article, the failure mechanism of porous materials under uniaxial stress has been investigated experimentally and the acoustic emission followed the characteristics of "crackling noise" with a power law distribution over an exceptionally large interval of 6 decades.
Abstract: The failure mechanism of porous materials under uniaxial stress has been investigated experimentally. Microporous SiO2, Vycor, has been subjected to slowly increasing compressive uniaxial stress with stress rates between 0.2 and 12.2 kPa/s. With increasing stress the strain changes stepwise with acoustic emission correlated with each volume collapse. The acoustic emission followed the characteristics of ‘crackling noise’ with a power law distribution over an exceptionally large interval of 6 decades at the slowest stress rate. The power law exponent is −1.39. Possible applications in mining industry and others are discussed.
57 citations
TL;DR: In this article, the generalized results obtained in investigations of growing crack acoustic emission (AE) from a standpoint of fracture mechanics were elaborated for this purpose, and a variety of new analytical relationships between crack parameters and AE signal parameters suitable for engineering calculations was obtained.
57 citations
57 citations
TL;DR: In this article, an intensity-modulated sensor based on the microbending concept was built and used to detect damage in laminated CFRP composite materials, which can be correlated with the acoustic emission signals, analysed by a classical AE parameter study and with a modal acoustic emission (MAE) system.
57 citations
TL;DR: In this paper, the authors present results from acoustic emission measurements obtained during three point bending tests on Nestos marble under laboratory conditions, and the potential for accurate prediction of rock damage based on acoustic emission data was investigated.
Abstract: Development of failure in brittle materials is associated with microcracks, which release energy in the form of elastic waves called acoustic emissions. This paper presents results from acoustic emission measurements obtained during three point bending tests on Nestos marble under laboratory conditions. Acoustic emission activity was monitored using piezoelectric acoustic emission sensors, and the potential for accurate prediction of rock damage based on acoustic emission data was investigated. Damage localization was determined based on acoustic emissions generated from the critically stressed region as scattered events at stresses below and close to the strength of the material.
57 citations