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Acoustic emission

About: Acoustic emission is a research topic. Over the lifetime, 16293 publications have been published within this topic receiving 211456 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the authors used acoustic emissions (AEs) as damage assessment precursors for rocks under cyclic loading-unloading and found that at low stress levels, there are almost no AE events generated in the unloading stage but at higher stress levels there are numerous AE events in the loading part of the cycle.

70 citations

Journal ArticleDOI
01 Nov 1997
TL;DR: In this paper, the detection of incipient cavitation in pumps using acoustic emission (AE) sensors has been investigated using a small-scale rig for the investigation of cavitation detection using AE sensors, and the acquisition of data on a 75 kW single-stage centrifugal pump in an industrial test loop under normal running and cavitation conditions.
Abstract: This work concerns the detection of incipient cavitation in pumps using acoustic emission (AE). Three activities have been pursued in this context: (a) the construction of a small-scale rig for the investigation of cavitation detection using AE sensors; (b) the acquisition of data on a 75 kW single-stage centrifugal pump in an industrial test loop under normal running and cavitation conditions; (c) the determination of parameters that could be used for the early diagnosis of cavitation within pumps.In the laboratory-scale apparatus water was pumped around a short loop by a 3 kW centrifugal pump. The flow loop contained a section specifically designed to induce cavitation by means of reducing the pressure level to that of the vapour pressure of the fluid. This apparatus was used to produce a variety of well-controlled cavitation conditions which were useful in determining the suitability of AE for the detection of cavitation.The industrial-scale tests consisted of progressively reducing the net pos...

70 citations

Journal ArticleDOI
TL;DR: In this paper, an elastodynamic Green's function approach was examined for center-cracked-plate specimens of mortar and concrete, and it was observed that the dominant mode of cracking was mode I (tensile).
Abstract: Recently acoustic emission (AE) techniques have been used to study crack propagation in materials. The application of these techniques to heterogeneous, quasi-brittle materials such as concrete requires a better understanding of how the signal generated from a microfracture is transformed due to wave propagation and due to the transducer response. In this study, piezoelectric transducers were calibrated using displacement transducers. The validity of an elastodynamic Green’s function approach was examined for cement-based materials. The acoustic emission source was characterized using moment tensor analysis. Acoustic emission measurements were analyzed for center-cracked-plate specimens of mortar and concrete. It was observed that, as expected, the dominant mode of cracking was mode I (tensile). However, mode II (shear) and mixed mode cracks also occurred, perhaps due to grain boundary sliding and interface debonding. Microfractures appear to localize prior to critical crack propagation. Mode I cracks generally required more energy release than mode II and a smaller inclusion provided a stronger interface bond than the larger ones.

70 citations

Journal ArticleDOI
TL;DR: In this article, the relationship between the acoustic emission (AE) parameters and the microfabric of granitic rock samples was investigated using a broad band multichannel recording system with a high dynamic recording range enabled individual AE events to be analyzed in a wide frequency and energy range.
Abstract: ¶Laboratory experiments on rock samples were carried out to understand the relationship between the acoustic emission (AE) parameters and rock fabric. AE activity was recorded during the uniaxial compression with constant stress rate of several granitic rocks showing variable microfabric (e.g. grain size, shape and crystallographic preferred orientation) and macrofabric (e.g. magmatic isorientation, metamorphic banding). A broad band multichannel recording system with a high dynamic recording range enabled individual acoustic emission events to be analysed in a wide frequency and energy range. The microfabric of the rocks was studied by quantitative petrographic analysis of thin sections allowing precise description of mode, grain size and shape. It has been proved that the energy-frequency distribution of AE events strongly reflects the fabric of the samples. The characteristic energy value of AE events reflects the most frequently occurring grain dimensions. The AE parameters like acoustic rate or cumulative energy are highly sensitive to fabric arrangement in rocks with pronounced fabric (e.g. foliation, lineation etc.).

70 citations

Journal ArticleDOI
TL;DR: In this article, the results from the fatigue tests of salt with discontinues cyclic loading path containing zero loading stress intervals (ZLIs) of different duration were reported, which suggests that the application of such intervals strongly changes the mechanical response of the salt samples including the fatigue life and the residual strain prior the failure.

70 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023701
20221,350
2021832
2020841
2019918
2018763