Characterization of Fracture Process in Sandstone: A Linear Correspondence Between Acoustic Emission Energy Density and Opening Displacement Gradient

Lin, Qing; Wang, Siqi; Wan, Bin; Lu, Yunhu; Wang, Yan

doi:10.1007/s00603-019-01949-8

Cited by 25 publications

(7 citation statements)

References 23 publications

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“…The results of related studies suggest that the acoustic emission energy can be evaluated as a quantity of material damage [35][36][37], and larger energy values correspond It can be seen from Figure 6 that the amplitudes are mostly distributed in the intervals of 40-50 dB and 50-60 dB after the action of hot and cold cycles at all temperatures, which means that most of the cracks generated inside the specimens during the Brazilian splitting test were small-scale cracks. The treatment of hot and cold cycles at different temperatures has a great influence on the amplitude distribution of granite disc specimens.…”

Section: Acoustic Emission Energy Characteristicsmentioning

confidence: 90%

Characteristics of Acoustic Emission Response during Granite Splitting after High Temperature-Water Cooling Cycles

Zhu

Yang²,

Liu

et al. 2022

Sustainability

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In order to investigate the effect of a high temperature-water cooling cycle on the acoustic emission characteristics of the granite splitting process, Brazilian splitting tests were conducted on granite disc specimens treated with high temperature–water cooling (cycle times 1, 5, 10, 15, 20) from 250 to 650 °C. The relationship between the acoustic emission count, cumulative acoustic emission number, amplitude distribution, and the maximum energy of the specimens and temperature as well as the number of hot and cold cycles were investigated, and the relationship between the acoustic emission changes and specimen damage during the splitting of the granite specimens after the high temperature-water cooling cycle was discussed and analyzed. The test results show that the acoustic emission changes in the splitting process of granite disc specimens have obvious hot and cold shock effects, and that the acoustic emission α value and amplitude density of the specimens at the initial stage of splitting show an increasing trend with an increasing number of hot and cold cycles, and the amplitude distribution is more obviously affected by temperature. When the temperature is low and the number of hot and cold cycles is small, the maximum energy value at the peak stress point is larger, and the maximum energy value tends to decrease gradually as the temperature increases and the number of cycles increases.

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Section: Acoustic Emission Energy Characteristicsmentioning

confidence: 90%

Characteristics of Acoustic Emission Response during Granite Splitting after High Temperature-Water Cooling Cycles

Zhu

Yang²,

Liu

et al. 2022

Sustainability

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“…Based on a single waveform of recorded AE signal (Figure 3), the AE characteristic parameters can be attained in real‐time by the AEwin software for tracing the fracture process, such as amplitude, duration time, count, energy, and AE event location. In this study, the AE count, AE energy, and AE event location, which are reported to be closely related to cracking position, intensity, and energy, were adopted to characterize the temporal and spatial developments of the cracking initiation and propagation 5,23,24,28 …”

Section: Materials and Test Methodsmentioning

confidence: 99%

“…In this study, the AE count, AE energy, and AE event location, which are reported to be closely related to cracking position, intensity, and energy, were adopted to characterize the temporal and spatial developments of the cracking initiation and propagation. 5,23,24,28 Furthermore, a plant of AE events with different amplitudes are generally released along with the formation and propagation of micro and macro cracks in rock. The crack types during different stages in the fracture process can be investigated by analyzing the distribution of AE amplitudes, which is known as "b-value analysis."…”

Section: Ae Equipmentmentioning

confidence: 99%

Experimental study on cracking process and fracture properties of granite under mode I loading by acoustic emission and digital image correlation

Xue

Lin

Wang

2023

Fatigue Fract Eng Mat Struct

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To explore mode‐I fracture process of hard brittle rocks, semi‐circular bending (SCB) experiments were performed with the concurrent monitoring of acoustic emission (AE) and digital image correlation (DIC). Experimental results revealed that all specimens exhibited ductile fracture characteristic and the fracture planes deviated from the ligament plane to different degrees due to interference from mineral crystals or pre‐existing weak surfaces within the intergranular boundaries. The whole cracking process can be divided into four stages: Microcrack initiation preparation, microcrack initiation and stable propagation, macrocrack formation and unstable propagation, and macrocrack coalescence. The onset of the microcrack initiation occurred at about pre‐80% load. The fracture process zone (FPZ) maintained a constant length as the crack propagated and the length of the traction free zone (TFZ) increased. The identified crack lengths based on the AE locations and energy statistical analysis consisted well with the crack lengths obtained from the DIC.

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“…Pre-drilled holes through a rhinestone to a depth of 0.8 of the height of the rock sample, weighed with 1.8kg of SCA and an appropriate amount of distilled water. [19] (2) Commissioning the AE equipment. The 8 transducer probes of the AE equipment were arranged on the 4 sides of the rock sample, connected to the preamplifier (gain set to 40 dB), then connected to the waveform collector and computer, the earth wire was fixed to a large stable instrument to discharge the interference of ambient noise, and the longitudinal velocity of the material was measured by the lead break test Vp.…”

Section: Test Proceduresmentioning

confidence: 99%

Investigation of the Acoustic Emission Behavior and Crack Evolution Characteristics of Limestone Broken by Static Crushing Agent

2023

AJAGE

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In order to investigate the effect of crack and acoustic emission evolution behaviour during the deformation and damage of rock specimens under the action of SCA, static crushing tests were systematically carried out on tuff specimens in the laboratory. Based on AE real-time monitoring techniques and macroscopic crack observations, the crack evolution mechanism of the cracked specimens during deformation and damage was investigated. The results show that there are three stages of microcrack incubation, macroscopic crack extension and cracking damage during SCA crushing. The tensile stress is 0.06-0.1 times of the compressive stress when brittle materials such as rocks are subjected to SCA leading to cracking damage. A large number of AE events with small amplitudes and a small number of AE events with large amplitudes represent that macroscopic cracks are generated by the rapid aggregation of a large number of microcracks before they are slowly formed. The cracking is usually done by first connecting adjacent holes into lines and then extending to the free surface. The direction of static crushing and the cracking effect can be controlled by designing the borehole location and free surface distribution.

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Characterization of Fracture Process in Sandstone: A Linear Correspondence Between Acoustic Emission Energy Density and Opening Displacement Gradient

Cited by 25 publications

References 23 publications

Characteristics of Acoustic Emission Response during Granite Splitting after High Temperature-Water Cooling Cycles

Characteristics of Acoustic Emission Response during Granite Splitting after High Temperature-Water Cooling Cycles

Experimental study on cracking process and fracture properties of granite under mode I loading by acoustic emission and digital image correlation

Investigation of the Acoustic Emission Behavior and Crack Evolution Characteristics of Limestone Broken by Static Crushing Agent

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