Acoustic Emission Testing

Große, Christian U.; Ohtsu, Masayasu

doi:10.1007/978-3-540-69972-9

Cited by 658 publications

(76 citation statements)

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“…AE location methods are directly adapted from earthquake location, and the traveltime inversion acts as the dominant approach (e.g., Ge, 2003aGe, , 2003b. In recent years, a category of signal-or waveform-based analysis techniques has been developed in AE location and source mechanism inversion (Grosse & Ohtsu, 2008;Ishida et al, 2017), benefiting from the improvement of computation, communication, and storage technologies. Both PWS and TRI have shown promising results in locating high-frequency AE events (e.g., López-Comino et al, 2017;Saenger et al, 2011).…”

Section: Gas Extraction Induced Earthquakesmentioning

confidence: 99%

Recent Advances and Challenges of Waveform‐Based Seismic Location Methods at Multiple Scales

Tan

Schwarz

et al. 2020

Reviews of Geophysics

132

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Source locations provide fundamental information on earthquakes and lay the foundation for seismic monitoring at all scales. Seismic source location as a classical inverse problem has experienced significant methodological progress during the past century. Unlike the conventional traveltime‐based location methods that mainly utilize kinematic information, a new category of waveform‐based methods, including partial waveform stacking, time reverse imaging, wavefront tomography, and full waveform inversion, adapted from migration or stacking techniques in exploration seismology has emerged. Waveform‐based methods have shown promising results in characterizing weak seismic events at multiple scales, especially for abundant microearthquakes induced by hydraulic fracturing in unconventional and geothermal reservoirs or foreshock and aftershock activity potentially preceding tectonic earthquakes. This review presents a comprehensive summary of the current status of waveform‐based location methods, through elaboration of the methodological principles, categorization, and connections, as well as illustration of the applications to natural and induced/triggered seismicity, ranging from laboratory acoustic emission to field hydraulic fracturing‐induced seismicity, regional tectonic, and volcanic earthquakes. Taking into account recent developments in instrumentation and the increasing availability of more powerful computational resources, we highlight recent accomplishments and prevailing challenges of different waveform‐based location methods and what they promise to offer in the near future.

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Section: Gas Extraction Induced Earthquakesmentioning

confidence: 99%

Recent Advances and Challenges of Waveform‐Based Seismic Location Methods at Multiple Scales

Tan

Schwarz

et al. 2020

Reviews of Geophysics

132

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“…The measuring system of AE signal was functionally coupled with the stress/strain testing machines and it was described in more details in [5,18]. A broad-band piezoelectric sensor (standard WD type, certified by Physical Acoustics Corporation) enabled to record the acoustic pulses in the frequency range from 100 kHz to 1 MHz.…”

Section: Acoustic Emission Measurementsmentioning

confidence: 99%

Plastic Instabilities Induced by the Portevin - Le Châtelier Effect and Fracture Character of Deformed Mg-Li Alloys Investigated Using the Acoustic Emission Method

Pawełek

Piątkowski

Wajda

et al. 2016

Archives of Metallurgy and Materials

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IntroductionUnsatisfying ability to plastic deformation at elevated temperatures, mostly leading to the reduction of deformability and/or hot plasticity is characteristic for many metals and alloys [1][2][3][4]. The occurrence of hot-shortness phenomenon, followed by the fracture of intercrystalline character is an important reason for technological difficulties. Previous investigations of the authors of the paper [5][6][7][8][9] of mechanical properties of alloys with the application of AE method were devoted to the Mg-Li-Al alloys and related composites generally in the context of the method of intensive deformation processes leading to their excellent mechanical properties, such as great strength and plasticity or even superplasticity. On the other hand, the investigations of metal and alloy plastic instability using the AE technique were carried out [10][11][12] mainly in the context of basic aspects of PL effect, twinning or shear band in both poly-and single metal and alloy crystals. The fracture and strengthening properties of Mg-Li based alloys (and composites) were investigated, for example in [13][14][15][16], but without the use of AE method, which proved to be a very useful technique of material examination. In this work the results of the investigations of the correlation between the AE phenomenon, the plastic instability, induced by PL effect, twining or shear bands, and the both, intergranular and transcrystalline fracture of Mg4Li5Al and Mg4Li4Zn alloys subjected to tensile and compression tests at wide range of elevated temperatures are presented.Alloys based on magnesium with lithium, as the lightest ones from among the known metallic construction materials, are very attractive from the point of view of their application as the materials for light, yet durable constructions to be used in the automotive industry (e.g. car engine housings), light housings of computers and aerospace technology. The basic Mg-Li alloys exist in three phase areas. The hexagonal α phase appears in the concentration range of Li up to 4 wt.%. If the content of Li is more than 12 wt.% -the β phase of cubic lattice occurs. The alloys of Li content from 4% up to 12 wt.% form the α+β two-phase mixture. The mechanical properties of α phase are worse from that of the β phase, which is more plastic and thus reveals good machinability and weldability. Alloying additions, e.g. Al (or Zn) from 3% to 5%, slightly increase the density of the alloy, but lead to the precipitation of coherent particles of transition phase, θ-MgLi 2 Al/θ-MgLi 2 Zn, which additionally strengthens the matrix and leads to the improvement of mechanical properties [14]. The present paper addresses the optical microscopic, as well as TEM and SEM observations of the failure of samples after tensile and compression tests.

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“…AE monitoring techniques can be applied in various applications such as machine condition/structure health monitoring, and tool condition monitoring. Many studies have attempted to use this technique to monitor crack initiation in forming process by investigating AE activities or extracted AE features (Grosse, 2008;Behrens et al, 2011;Behrens et al, 2016). They suggested that the extracted AE features could be used to indicate crack initiation and growth during the deformation process.…”

Section: Introductionmentioning

confidence: 99%

Bendability evaluation of sheet metals in three-point bending test by using acoustic emission features

Seemuang¹,

Panich²,

Slatter³

2017

j.appsci

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In this work, bendability evaluation of three sheet metals, a galvanized steel (JAC780Y), a stainless steel (SUS304) and a cold rolled steel (SPCC) was precisely investigated using an acoustic emission (AE) technique. A three-point bending test, with three different punch plate radii, was performed to evaluate the formability of the metal sheets in bending and hemming processes. Bending force-displacement curves were derived from the results of the tests and were correlated with AE features (Root Mean Square and Peak-to-Peak) that were extracted from data obtained during those tests. These correlations showed for the first time that AE techniques could be used to detect an intercrystalline fracture from bending behavior and also to evaluate the bendability of the given materials.

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Acoustic Emission Testing

Cited by 658 publications

References 1 publication

Recent Advances and Challenges of Waveform‐Based Seismic Location Methods at Multiple Scales

Recent Advances and Challenges of Waveform‐Based Seismic Location Methods at Multiple Scales

Plastic Instabilities Induced by the Portevin - Le Châtelier Effect and Fracture Character of Deformed Mg-Li Alloys Investigated Using the Acoustic Emission Method

Bendability evaluation of sheet metals in three-point bending test by using acoustic emission features

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