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

Published on Feb 1, 2020in Rock Mechanics and Rock Engineering4.14
· DOI :10.1007/S00603-019-01949-8
Qing Lin11
Estimated H-index: 11
(China University of Petroleum),
Siqi Wang4
Estimated H-index: 4
(China University of Petroleum)
+ 2 AuthorsYan Wang7
Estimated H-index: 7
(Iowa State University)
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Abstract
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References26
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#1Qing Lin (China University of Petroleum)H-Index: 11
#2Bin Wan (China University of Petroleum)H-Index: 3
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Abstract Acoustic emission (AE) and digital image correlation (DIC) were combined to characterize the fracture process zone (FPZ) in Berea sandstone, a quasi-brittle material with a maximum grain size of 1 mm. The complimentary techniques of AE and DIC provide information on (i) damage throughout the volume, including AE locations and relative energy, and (ii) detailed DIC measurements of opening displacements associated with the FPZ. Three types of specimens were tested by three-point bending: ...
14 CitationsSource
#1Qing Lin (China University of Petroleum)H-Index: 11
#2Dengtian Mao (CNOOC Limited)H-Index: 1
Last. Shiyuan Li (China University of Petroleum)H-Index: 2
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Abstract The influences of mode II loading on fracture process in Berea sandstone were investigated by comparing mode I and mixed-mode fractures that were created by center and eccentric notch beams under three-point bending. Fracture process was characterized by Acoustic Emission (AE) and related energy. Experimental results show mode II loading does not affect the length of fully-developed fracture process zone and maximum value of AE energy. However, it affects the zone from reaching fully-de...
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#1Bing Q. Li (MIT: Massachusetts Institute of Technology)H-Index: 4
#2Herbert H. Einstein (MIT: Massachusetts Institute of Technology)H-Index: 33
We present an experimental study in which a pre-notched specimen of Barre Granite was subjected to four point bending under crack mouth opening displacement control. The experimental observations consisted of load–displacement measurements, acoustic emissions, and photography on a macroscopic (~cm) as well as microscopic (~μm) scale. These observations were compared and analysed to better understand process zone development and crack propagation. Load–displacement data showed that the load reach...
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Abstract An analysis of the Acoustic Emission (AE) activity and of the energy fields is carried out with reference to three-point bending (TPB) tests on concrete beams with different sizes. First, a cracking mode classification is performed on the basis of AE parameters like the average frequency and the rise angle of the waveforms. A compression test is also performed to verify if the identification of the fracture mode by means of the AE parameters is appropriate. Then, regarding the TPB tests...
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#1Michael J. Heap (UDS: University of Strasbourg)H-Index: 41
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Compaction bands in sandstone are laterally extensive planar deformation features that are characterized by lower porosity and permeability than the surrounding host rock. As a result, this form of localization has important implications for both strain partitioning and fluid flow in the Earth's upper crust. To better understand the time dependency of compaction band growth, we performed triaxial deformation experiments on water-saturated Bleurswiller sandstone (initial porosity = 0.24) under co...
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We examine the use of a linear softening cohesive fracture model (LCFM) to predict single-trace fracture growth in short-rod (SR) and notched 3-point-bend (N3PB) test configurations in Indiana Limestone. The broad goal of this work is to (a) understand the underlying assumptions of LCFM and (b) use experimental similarities and deviations from the LCFM to understand the role of loading paths of tensile fracture propagation. Cohesive fracture models are being applied in prediction of structural a...
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#1Qing Lin (China University of Petroleum)H-Index: 11
#2Hui-na Yuan (THU: Tsinghua University)H-Index: 3
Last. Joseph F. LabuzH-Index: 32
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Abstract Fracture tests were performed on sandstone specimens under three-point bending with a variety of notch positions to achieve KII/KI = 0–12%. At peak load, the maximum crack opening displacement measured by digital image correlation was 45 μm under mixed mode loading and 30 μm under mode I, and these values were used to determine the length of the cohesive zone: 10–12 mm for mixed mode and 5–7 mm for mode I. For mixed mode fracture, the displacement in the cohesive zone was identified to ...
50 CitationsSource
#1Qing Lin (PKU: Peking University)H-Index: 11
#2Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
Abstract Evaluation of mode I fracture characteristics, such as critical opening displacement and process-zone length, is fundamental for the analysis and prediction of crack growth. To identify deformation with micron-scale resolution, experiments were performed using digital image correlation, where displacement is determined through a comparison of a pair of digital images by matching a small area from the image before deformation to the image after deformation. The matching process uses a cr...
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#1Qianbing Zhang (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 25
#2Jian Zhao (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 63
We present a detailed experimental procedure for the quantitative determination of mechanical properties and full-field strain measurement of rock material under dynamic loads. Three kinds of testing methods, i.e., notched semi-circular bending, Brazilian disc, and uniaxial compression, were conducted using a split Hopkinson pressure bar (SHPB) system. Experimental setup, data acquisition and interpretation were described in detail. The digital image correlation (DIC) technique in conjunction wi...
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#1Xiaoran Wang (CUMT: China University of Mining and Technology)
#2Pouyan Asem (UMN: University of Minnesota)H-Index: 6
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Abstract Acoustic emission (AE) and digital image correlation were used to monitor mode I fracture in center notch and smooth boundary specimens. The AE source was characterized as a microcrack and represented by the moment tensor, which was obtained by minimizing the error between displacements calculated from an elastodynamic solution and those measured, subjected to the constraint of a microcrack source. Results showed that microcracking was locally mixed-mode dominant because of oblique micr...
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#2Bingxiang Huang (CUMT: China University of Mining and Technology)H-Index: 1
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Abstract The development of a fracture process zone (FPZ) (microcrack zone) ahead of a fracture tip is a prominent fracture characteristic of rock-like materials. At present, understanding of the quasi-static loading-rate effect on the FPZ development of a mixed-mode (I-II) fracture remains challenging for rock-like materials. In this paper, the centrally cracked Brazilian disk (CCBD) specimens of artificial rock-like materials were tested to create mixed-mode (I-II) fractures at different quasi...
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