Experimental investigation of microscopic crack development and damage characteristics of sandstone based on acoustic emission characteristic parameters

Yang, Jianguo; Yang, Shengqiang; Tian, Wen‐Ling

doi:10.1007/s40948-022-00361-x

Cited by 19 publications

(6 citation statements)

References 39 publications

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“…K-means cluster analysis is a commonly used image segmentation method, which can identify similar tendencies in images and classify them. K-means cluster analysis can well observe the crack changes in the image …”

Section: Resultsmentioning

confidence: 99%

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Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

Zhang

Nie

2023

Energy Fuels

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The fracturing experiment of hard rock was carried out by self-designed high-voltage electrical pulse (HVEP) equipment. When the discharge voltage was 10 kV, the capacitance was increased from 20 to 500 μF to increase discharge energy. The rock was fractured at discharge conditions of 10 kV and 500 μF. Images of the fracture process of the rock were recorded. The action characteristics of HVEP are obtained by analyzing the current waveforms, strain curves, and vibration curves at different discharge energies. The increase in capacitance can enhance the current peak, strain peak, and peak particle velocity (PPV). Therefore, increasing the capacitance can achieve a stronger cracking effect. However, the discharge effect of HVEP does not always increase with the increase of capacitance. The rock will show obvious instability characteristics due to the appearance of cracks, including the prolongation of peak strain time and the acceleration of vibration decay rate.

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Section: Resultsmentioning

confidence: 99%

“…K-means cluster analysis can well observe the crack changes in the image. 32 The crack appeared 3 ms after HVEP, which is approximately straight. The research of Wang et al shows that blasting creates cracks in the rock in all directions.…”

Section: Image Features Of Rockmentioning

confidence: 96%

Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

Zhang

Nie

2023

Energy Fuels

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“…However, the mechanical properties of FMLs are their unique anisotropy, and there is a strong correlation between their failure form and its anisotropy, especially the carbon fiber reinforced composite material, which is composed of fiber and matrix, and the accumulation of microscopic defects and cracks determines the characteristics of macroscopic failure [140][141][142]. In the process of finite element simulation, the researchers use the single cell model under the fine scale, and build the internal fiber bundle of the material and woven or woven geometry parameters, pretreatment through CAD modeling and the finite element meshing software, and adopt appropriate failure criteria based on different failure modes to calculate the stress and strain distribution after damage on the mesoscale [143][144][145][146].…”

Section: Macroscopic and Detailed View Simulationmentioning

confidence: 99%

A review of FMLs performance test methods and index evaluation

et al. 2023

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With its excellent fatigue performance and high damage tolerance and other irreplaceable advantages, FMLs have gradually increased the demand in aerospace, rail transit, ship and other fields, and have put forward higher requirements for the speed and accuracy of its performance test and index evaluation. In this paper, the methods of performance test, analysis and index evaluation of FMLs are introduced from three aspects with carbon fiber and composite materials, mechanical properties and numerical simulation technology, details the common test methods, the latest technology and progress, and analyzes their advantages and disadvantages, so as to provide direction and reference for the performance test method and index evaluation of FMLs. Finally, the main development directions of the current performance testing methods and index evaluation of FMLs are briefly discussed.

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“…The failure of rock is essentially the process of internal crack initiation and expansion until macroscopic cracks are formed; therefore, there is an inevitable connection between the acoustic emission phenomenon of rock and the force failure of rock [8,9]. According to the indoor acoustic emission test law, the acoustic emission characteristics of different rock failure processes are studied; it plays an extremely important role in the study of rock deformation, failure, and instability; the use of acoustic emission detection technology can effectively monitor the real-time information of changes in the rock [10][11][12], and predicting the process of rock failure [13][14][15] has a wide range of engineering application value [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Acoustic Emission Characteristics of Granite and Sandstone under Uniaxial Compression

Sun

2023

Geofluids

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In order to better apply acoustic emission technology to engineering practice, this paper carried out indoor acoustic emission test, and uniaxial compression tests of granite and sandstone under monotonic loading and grading loading were carried out and monitored. The influencing factors of the acoustic emission characteristics of the two rock samples were discussed and the characteristics of the acoustic emission signals corresponding to different stages of rock failure were analyzed. The analysis of the test results includes the curve fitting relationship between the AE event count rate, energy rate, and stress time and the changes of AE event count rate and energy rate under different loading methods. The results of the study are as follows: there is a quiet zone in the acoustic emission event before the rock is destroyed and destabilized, and the higher the rock strength, the more obvious the quiet zone; this important feature can be used as a precursor feature of rock mass failure for prediction, and the rock acoustic emission energy rate is more obvious in the quiet area before destruction than the acoustic emission event rate; rock acoustic emission has experienced initial compaction zone, rising zone, peak zone, and descending zone, whether different rocks go through each stage and how long each stage lasts is related to the nature of the rock; under different loading methods, the failure mechanism of rock is different; the different loading rates of monotonic loading and grading loading will affect the change rate of acoustic emission.

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Experimental investigation of microscopic crack development and damage characteristics of sandstone based on acoustic emission characteristic parameters

Cited by 19 publications

References 39 publications

Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

Investigation of the Experimental High-Voltage Electric Pulse Fracturing of Rock with Capacitance as a Variable

A review of FMLs performance test methods and index evaluation

Experimental Study on Acoustic Emission Characteristics of Granite and Sandstone under Uniaxial Compression

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