A comparative acoustic emission study of compression and impact fracture in granite

Chmel, A. E.; Щербаков, И. П.

doi:10.1016/j.ijrmms.2013.08.025

Cited by 49 publications

(26 citation statements)

References 22 publications

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“…Acquisition, digitization, storage and analysis Specimen AE sensors AE monitoring of rock material under compression showed mainly two time zones of high "avalanche-like" activity, interrupted by a long period of acoustic silence [12]. The effect of temperature on brittleness of marble was studied with AE corresponding very well to the "rupture evolution law" [13].…”

Section: Pre-amplifiersmentioning

confidence: 99%

“…The evolution of AE activity was very indicative of the strain at creep experiments of granite [6]. The AE activity and energy release during compression was used to indicate the damage level showing that in marble, main damage comes with the peak stress, while AE monitoring of rock material under compression showed mainly two time zones of high "avalanche-like" activity, interrupted by a long period of acoustic silence [12]. The effect of temperature on brittleness of marble was studied with AE corresponding very well to the "rupture evolution law" [13].…”

Section: Introductionmentioning

confidence: 99%

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Acoustic Emission Activity for Characterizing Fracture of Marble under Bending

2015

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Abstract:The present paper occupies with the acoustic emission (AE) monitoring of fracture of marble. The specimens belong to two different material types and were tested in three-point bending after being ultrasonically interrogated. Consequently, they were repaired by means of suitable epoxy agent and mechanically re-loaded. Apart from the well-known correlation of pulse velocity to strength, which holds for the materials of this study as well, AE provides some unique insight in the fracture of the media. Parameters like the frequency content of the waveforms, and their duration among others show a transition in relation to the load. According to their strength class, the specimens exhibit distinct AE characteristics even at low load, enabling to judge their final strength class after having sustained just a small percentage of their ultimate capacity. More importantly, the AE activity during reloading indicates the quality of repair; specimens with good restoration of strength, exhibited similar AE activity to the intact specimens, while specimens with lower repaired capacity exhibited random behavior. This work discusses the passive monitoring of marble fracture and shows that AE parameters that have been used to successfully characterize cementitious materials, provide good results in monolithic materials like marble as well. It is suggested that AE monitoring during a proof loading can provide good information on the potential strength class, which is especially useful for repaired specimens, where the pulse velocity cannot be easily used.

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Section: Pre-amplifiersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Activity for Characterizing Fracture of Marble under Bending

2015

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“…In recent years, AE detection technology has been used in rock mechanics by many scholars [20][21][22][23][24][25][26][27]. For example, Ganne et al [20] studied the brittleness of rock before peak stress by the AE technique, and four stages of accumulated AE energy were given.…”

Section: Introductionmentioning

confidence: 99%

“…Gasc et al [23] studied rock structural transformation and mineral reaction under high temperatures and high pressures by X-ray diffraction and AE detection of serpentine. Chmel et al [24] studied AE energy release of granite under impact loading. Zhang et al [25] studied AE properties of halite, glauberite, and gypsum during compression test with different loading styles and saturation conditions.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Zhang

2018

Advances in Materials Science and Engineering

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Acoustic emission (AE) signals can be detected from rocks under the effect of temperature and loading, which can be used to reflect rock damage evolution process and predict rock fracture. In this paper, uniaxial compression tests of granite at high temperatures from 25°C to 1000°C were carried out, and AE signals were monitored simultaneously. e results indicated that AE ring count rate shows the law of "interval burst" and "relatively calm," which can be explained from the energy point of view. From 25°C to 1000°C, the rock failure mode changes from single splitting failure to multisplitting failure, and then to incomplete shear failure, ideal shear failure, and double shear failure, until complete integral failure. ermal damage (D T ) defined by the elastic modulus shows logistic increase with the rise of temperature. Mechanical damage (D M ) derived by the AE ring count rate can be divided into initial stage, stable stage, accelerated stage, and destructive stage. Total damage (D) increases with the rise of strain, which is corresponding to the stress-strain curve at various temperatures. Using AE data, we can further analyze the mechanism of deformation and fracture of rock, which helps to gather useful data for predicting rock stability at high temperatures.

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“…Chmel and Shcherbakov [12] carried out experimental study on the AE characteristics of compression and dynamic fracture in granite, which contributes to assessing the relationship between events occurring under nonequilibrium conditions. Based on the biaxial compression tests, Baddari et al [13] adopted electromagnetic radiation and acoustic emission to study the failure process of large rock samples, and the results can provide an analysis platform for forecasting the dynamic disaster.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths

Jiang

Zuo

et al. 2017

Shock and Vibration

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To explore the failure precursors of hard rock, a series of triaxial loading and unloading experiments were carried out on sandstone sample using the acoustic emission systems. The extreme-point symmetric mode decomposition method (ESMD method) was used to denoise and reconstruct the AE data. The AE quiet period in Scheme I becomes much more obvious with the confining pressure increasing, which can be regarded as the precursor information of the sample failure under conventional triaxial compression. Unlike Scheme I, there are no obvious precursory characteristics before failure in Schemes II and III, and the count rate reaches the maximum at the peak point. When the stress ratio ranges from 0.8 to 1.0, the fractal values of acoustic emission can be used to investigate the failure precursors of samples at a lower confining pressure. When the time ratio is greater than 0.8 under higher confining pressures, the fractal values of sandstone samples under unloading paths are rapidly reduced, which can be used to predict rock failure at higher confining pressures.

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A comparative acoustic emission study of compression and impact fracture in granite

Cited by 49 publications

References 22 publications

Acoustic Emission Activity for Characterizing Fracture of Marble under Bending

Acoustic Emission Activity for Characterizing Fracture of Marble under Bending

Acoustic Emission and Damage Characteristics of Granite Subjected to High Temperature

Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths

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