Overview of acoustic emission monitoring of rock structures

Koerner, Robert M.; McCabe, W. Martin; Lord, Arthur E.

doi:10.1007/bf01239775

Cited by 59 publications

(16 citation statements)

References 3 publications

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“…Acoustic emission (AE) or microseismicity (MS) monitoring is a viable non-destructive method for detecting microfracturing prior to a macroscopic rock fracture. According to reviews by Hardy (1977) and Koerner et al (1981), this monitoring method was used to evaluate the stability of rock masses in mines in the late 1930's (Hodgson, 1943;Obert and Duvall, 1946), and has been applied in investigations of rockbursts in mines (e.g., papers in Tang, ed. 2009).…”

Section: Introductionmentioning

confidence: 99%

Source distribution of acoustic emissions during an in-situ direct shear test: Implications for an analog model of seismogenic faulting in an inhomogeneous rock mass

Ishida¹,

Kanagawa

Kanaori

2010

Engineering Geology

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Section: Introductionmentioning

confidence: 99%

Source distribution of acoustic emissions during an in-situ direct shear test: Implications for an analog model of seismogenic faulting in an inhomogeneous rock mass

Ishida¹,

Kanagawa

Kanaori

2010

Engineering Geology

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“…Acoustic emission (AE) phenomenon, which is generated spontaneously by the rapid release of energy from microcracking within brittle rock and metal materials, has been extensively studied. Lockner [11] gave a detailed overview on the study of rock failure through use of the AE method, which can provide information about the size, location of the acoustic events and deformation mechanisms of materials [12,13]. Thus, a micro crack in a rock specimen could be detected by recording AE signals, as well as a planar location of AE sources using the AE method during the whole shear process for rock fractures [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Shear failure modes and AE characteristics of sandstone and marble fractures

Guo

Dong

2019

Open Geosciences

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To study the shear failure modes of rock fractures with different morphologies, rock types and test conditions, direct shear tests were conducted with the aid of an acoustic emission test system to obtain the characteristics of acoustic emissions in the shear process. The test results indicated that sandstone fractures experienced brittle shear failure under higher constant normal loads (15-30 kN) and plastic shear failure under lower normal loads (5 kN and 10 kN), while the marble fracture experienced plastic shear failure under each normal load. Dropping of shear stress, sharp change from shear dilatation to shear shrinkage and sudden release of high AE energy could be found when brittle shear failure occurred in sandstone fracture under a higher normal load. Thus, combining the location evolution characteristics of acoustic emission, it can be concluded that the entire shear dislocation of sandstone fracture in brittle shear failure mode happened just after the peak under higher normal loads. However, the entire shear dislocation of sandstone fracture under lower normal loads and marble fracture under all normal loads occurred just at the beginning of the shear process.

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“…Among these methods, acoustic emission (AE) technique [ 33 , 34 , 35 , 36 ], a passive monitoring technique that detects the damage by analyzing the elastic stress wave generated as a result of deformation and fracture in materials, is appropriate to monitor the wear process of pin connections. Compared with other nondestructive evaluation methods, it is more sensitive and less susceptible to complex structural geometry [ 37 ], therefore, the AE technique has been widely used in different fields, including civil engineering [ 38 , 39 ], especially bridge engineering [ 40 , 41 ], mechanical engineering [ 42 , 43 , 44 ], and rock mechanics [ 45 , 46 , 47 ]. In civil engineering, Abouhussien et al [ 48 ] exploited acoustic emission (AE) monitoring to classify the stages of bond deterioration under pull-out tests, and proposed damage classification charts based on the intensity analysis.…”

Section: Introductionmentioning

confidence: 99%

Wear Degree Quantification of Pin Connections Using Parameter-Based Analyses of Acoustic Emissions

Wang

Huo

Song

2018

Sensors

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Pin connections are commonly used in many engineering fields, and continuous operation may cause severe wear on the pins and may lead to their eventual fracture, if undetected. However, a reliable nonintrusive real-time method to monitor the wear of pin connections is yet to be developed. In this paper, acoustic emission (AE)-based parametric analysis methods, including the logarithm of the cumulative energy (LAE), the logarithm of the slope of cumulative energy (LSCE), the b-value method, the Ib-value method, and the fast Fourier transformation (FFT), were developed to quantify the wear degree of pin connections. The b-value method offers a criterion to quickly judge whether severe wear occurs on a pin connection. To assist the research, an experimental apparatus to accelerate wear test of pin connections was designed and fabricated. The AE sensor, mounted on the test apparatus in a nondestructive manner, is capable of real-time monitoring. The micrographs of the wear of pins, and the surface roughness of pins, verified that the values of the max LAE and the max LSCE became larger as the wear degree of pin connections increased, which means different values of the max LAE and the max LSCE can reflect different wear degree of pin connections. Meanwhile, the results of the micrographs and surface roughness confirmed that the b-value is an effective method to identify severe wear, and the value “1” can be used as a criterion to detect severe damage in different structures. Furthermore, the results of spectrum analysis in the low frequency range showed that the wear frequency was concentrated in the range of 0.01 to 0.02 MHz for the pin connection. This study demonstrated that these methods, developed based on acoustic emission technique, can be utilized in quantifying the wear degree of pin connections in a nondestructive way.

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Overview of acoustic emission monitoring of rock structures

Cited by 59 publications

References 3 publications

Source distribution of acoustic emissions during an in-situ direct shear test: Implications for an analog model of seismogenic faulting in an inhomogeneous rock mass

Source distribution of acoustic emissions during an in-situ direct shear test: Implications for an analog model of seismogenic faulting in an inhomogeneous rock mass

Shear failure modes and AE characteristics of sandstone and marble fractures

Wear Degree Quantification of Pin Connections Using Parameter-Based Analyses of Acoustic Emissions

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