Qing Lin
China University of Petroleum
Ultimate tensile strengthDigital image correlationGeologyMode (statistics)BrittlenessComposite materialElectronic speckle pattern interferometryAcoustic emissionGeotechnical engineeringMaterials scienceDeformation (meteorology)GeometryDisplacement (orthopedic surgery)SofteningFracture processFracture (geology)Displacement (vector)MechanicsFracture mechanicsStructural engineeringThree point flexural testBendingShear (geology)
31Publications
11H-index
437Citations
Publications 26
Newest
#1Qing Lin (China University of Petroleum)H-Index: 11
#2Xin Bian (China University of Petroleum)H-Index: 1
Last. Yunhu Lu (China University of Petroleum)H-Index: 11
view all 5 authors...
Abstract Fracture criterion of local symmetry has been widely used to predict the fracture kink and simulate the fracture trajectory in rocks under the mixed-mode loading. Although its prediction is a tension dominated fracture, under small scale yielding the criterion must include two aspects: the local mode I stress intensity factor (SIF) kI is maximum and the local mode II SIF kII is zero. Two aspects are not identical when fracture just initiates, but they will be equivalent after the crack ...
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#1Qing Lin (China University of Petroleum)H-Index: 11
#2Siqi Wang (China University of Petroleum)H-Index: 4
Last. Yunhu Lu (China University of Petroleum)H-Index: 11
view all 5 authors...
Abstract Influence of the fracture process zone (FPZ) poses a challenge to accurately determine the FPZ and traction-free crack during the fracture process in a rock structure. In this study, an engineering approach based on concepts of the cohesive zone model, is proposed to identify them in a sandstone beam under three-point bending. Two types of specimens were tested, including center notch and smooth boundary beams. Acoustic emission (AE) and digital image correlation (DIC) were used to moni...
1 CitationsSource
#1Qing Lin (China University of Petroleum)H-Index: 11
#2Siqi Wang (China University of Petroleum)H-Index: 4
Last. Yunhu Lu (China University of Petroleum)H-Index: 11
view all 5 authors...
Abstract Mode II fracture, as one basic fracture mode, remains an interesting topic in fracture mechanics. However, its realization is a challenge in the laboratory, especially for quasi-brittle materials. In this study, two types of specimens were tested: the angled edge crack semi-circular specimen under three-point bending (SCB) and double edge notched compression (DENC) specimen. Digital image correlation (DIC) was used to measure the displacements surrounding the notch tip, which helps to i...
4 CitationsSource
#1Qing Lin (China University of Petroleum)H-Index: 11
#2Siqi Wang (China University of Petroleum)H-Index: 4
Last. Yan Wang (Iowa State University)H-Index: 7
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2 CitationsSource
#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
#2Bin Wan (China University of Petroleum)H-Index: 3
Last. Ali Fakhimi (TMU: Tarbiat Modares University)H-Index: 18
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Abstract Crack initiation and propagation in rock involve the development of a nonlinear zone around the crack tip called fracture process zone. The existence of fracture process zone influences the fracture behavior and therefore it must be carefully investigated. This zone is normally idealized as a cohesive zone whose mechanical properties are difficult to measure. In this study, a relatively simple approach is proposed to identify the properties of the cohesive zone and the length of the coh...
8 CitationsSource
#1Qing Lin (China University of Petroleum)H-Index: 11
#2Wei-Wei Ji (CAS: Chinese Academy of Sciences)H-Index: 4
Last. Yunhu Lu (China University of Petroleum)H-Index: 11
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Abstract Laboratory determination of the mode II fracture toughness KIIC for rocks and rock-type materials remains a challenge task. One of the testing approaches is the compression of disk-type specimens, which is simple and convenient. However, although the notch in disk-type specimen is under mode II loading, the detailed studies reveal the drawbacks about interpretations of the disk-type specimens: (i) mode II fracture is only assumed without careful identifications about the actual fracture...
7 CitationsSource
#1Ali Fakhimi (TMU: Tarbiat Modares University)H-Index: 18
#2Qing Lin (China University of Petroleum)H-Index: 11
Last. Joseph F. Labuz (UMN: University of Minnesota)H-Index: 32
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Abstract Rock fracture and the induced displacement field are investigated through physical and numerical experiments. A Berea sandstone specimen with a central notch was tested in three-point bending. Digital image correlation (DIC) was used to obtain the displacement patterns as the fracture initiated and propagated. The DIC results clearly show the development of a damage zone and displacement discontinuity along the center line of the beam at peak load. It is suggested that a traction-free o...
20 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...
15 CitationsSource
#1Y. K. Xing (China University of Petroleum)H-Index: 1
#2G. Q. Zhang (China University of Petroleum)H-Index: 1
Last. Y. Qi (Gas Technology Institute)H-Index: 1
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3 Citations