Mechanical Behavior of 3D Crack Growth in Transparent Rock-Like Material Containing Preexisting Flaws under Compression

Tang, Hu-dan; Zhu, Zhende; Zhu, Ming-li; Lin, Heng-Xing

doi:10.1155/2015/193721

Cited by 13 publications

(5 citation statements)

References 37 publications

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“…Some scholars have studied the crack propagation process from the wing crack reaching the limited length to the sample fracture and found that there was still a crack propagation process from the wing crack propagation to the sample failure. Tang et al (2015) found that after the wing crack propagation reached 1.5 times the prefabricated crack radius, many microcracks appeared in the crack‐free zone of the sample. These microcracks propagated and merged with the secondary cracks and finally penetrated the sample.…”

Section: Discussionmentioning

confidence: 99%

Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression

Wang

et al. 2023

Deep Underground Science and Engineering

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Fractures are widely present in geomaterials of civil engineering and deep underground engineering. Given that geomaterials are usually brittle, the fractures can significantly affect the evaluation of underground engineering construction safety and the early warning of rock failure. However, the crack initiation and propagation in brittle materials under composite loading remain unknown so far. In this study, a three‐dimensional internal laser‐engraved cracking technique was applied to produce internal cracks without causing damage to the surfaces. The uniaxial compression tests were performed on a brittle material with internal cracks to investigate the propagation of these internal cracks at different dip angles under compression and shear. The test results show that the wing crack propagation mainly occurs in the specimen with an inclined internal crack, which is a mixed‐Mode I–II–III fracture; in contrast, Mode I fracture is present in the specimen with a vertical internal crack. The fractography characteristics of Mode III fracture display a lance‐like pattern. The fracture mechanism in the brittle material under compression is that the internal wing cracks propagate to the ends of the whole sample and cause the final failure. The initial deflection angle of the wing crack is determined by the participation ratio of stress intensity factors KII to KI at the tip of the internal crack.

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Section: Discussionmentioning

confidence: 99%

Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression

Wang

et al. 2023

Deep Underground Science and Engineering

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“…ere are several types of transparent similar materials commonly used by researchers to simulate rocks, including ice [18], PMMA [19][20][21][22], and resin materials [23][24][25][26], and among which PMMA and resin materials are the most widely used. However, resin materials compared with PMMA have become a hotspot in the development of transparent rock-like materials due to their strong plasticity.…”

Section: Selection Of Raw Materialsmentioning

confidence: 99%

A Method for Making Transparent Hard Rock-Like Material and Its Application

2019

Advances in Materials Science and Engineering

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At present, a similar material most commonly used in the similarity model experiment of rock blasting is cement mortar. However, it is not transparent, which leads to the problem that the cracks in the model made of cement mortar after the test cannot be observed directly. Therefore, a kind of transparent hard rock-like material that can replace the existing model material to solve the above problem was developed in this study. This transparent hard rock-like material is made of a mixture of rosin saturated solution (RSS), epoxy resin (ER), and curing agent (CA), and its physical and mechanical properties are similar to those of hard rock through relevant tests. In addition, it is found through the blasting model test that the model specimen made of transparent hard rock-like materials has the characteristic of “direct observation” after blasting test, which conforms to the rock blasting fracture mechanism. Hence, it can replace the existing nontransparent model materials to be applied in rock blasting similar model experiment. The results from this study are helpful to the further experimental study of blasting crack propagation in deep rock mass.

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“…Because of the low homogeneity of shale, researchers at home and abroad pay little attention to crack initiation and propagation, and most of them focus on other rocks or rock-like materials. − Li et al , studied the progressive fracture behavior of brittle lithologic rocks, such as shale and granite. Lajtai divided the failure process of rock materials under uniaxial compression into six stages.…”

Section: Introductionmentioning

confidence: 99%

Crack Evolution and Failure Modes of Shale Containing a Pre-Existing Fissure under Compression

Liu

et al. 2021

ACS Omega

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To investigate the crack evolution of Longmaxi shales with a single prefabricated fissure, a CCD (charge coupled device) camera and AE (acoustic emission) monitoring equipment were employed. On the basis of real-time CCD photographs and AE events, a real-time crack evolution process in fissured shale specimens under uniaxial compression was investigated. The crack initiation angle and extension angle were calculated, the relationship between the crack initiation stress, strength, and crack angle was compared, and the proportion of tensile and shear cracks at different stages of the whole compression process was briefly analyzed. The results demonstrate that, with the increase in fissure angle (α), the weakening ability of the prefabricated fissure to uniaxial compressive strength and crack initiation stress was reduced. The initial cracks and secondary cracks always appeared at the tip of the pre-existing fissure in the form of tensile cracks for α = 30–90°. The crack initiation angle and expansion angle increased first and then decreased rapidly with α increasing. Furthermore, the ultimate failure modes were mixed tensile and shear failure when α = 0–90°. The crack evolution of the fissured shale was progressive, but the final failure of the fissured specimen occurred rapidly. Furthermore, the appearance of the cracks, stress drops, and AE counts had good consistency in time.

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Mechanical Behavior of 3D Crack Growth in Transparent Rock-Like Material Containing Preexisting Flaws under Compression

Cited by 13 publications

References 37 publications

Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression

Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression

A Method for Making Transparent Hard Rock-Like Material and Its Application

Crack Evolution and Failure Modes of Shale Containing a Pre-Existing Fissure under Compression

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