The Mechanism Investigation on Propagation and Coalescence Pattern of Three Internal Plane Flaws in Brittle Materials

Guo, Yanshuang; Zhu, Wei Shen; Wong, Ryc; Li, Shu Cai; Lin, Chun Jin

doi:10.4028/www.scientific.net/kem.324-325.739

Cited by 9 publications

(4 citation statements)

References 3 publications

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“…Fu et al (2016) thought that this feature was an artificial phenomenon caused by the processing technology of internal cracks. Some scholars have observed the occurrence of counter-wing cracks (Guo et al, 2006) and self-similar crack propagation on the prefabricated crack surface (Li et al, 2007), but these phenomena are not universal and cannot be taken as the inevitable result of compression shear failure. Similarly, the wing crack phenomenon observed in this study also differs from previous test results.…”

Section: The Process Of Wing Crack Growthmentioning

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: The Process Of Wing Crack Growthmentioning

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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“…The wing cracks shifted from a position at the flaw tips to the flaw centers with the flaw inclination decreased. Dyskin et al 17 and Guo et al 18 used different transparent resins to study the growth mechanism of internal cracks and the effects of cracks location and geometry on the results. This study shows that the result basically is in agreement with two-dimensional case when the ratio (abbreviated as the crack depth ratio) d/t of preexisting crack depth to the thickness of the sample is relatively great.…”

Section: Dmentioning

confidence: 99%

Research on crack initiation mechanism and fracture criterion of rock-type materials under compression–shear stress

Yue

Sun

Liu

et al. 2017

Advances in Mechanical Engineering

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With the focus on the failure of single-cracked rocks under compression-shear stress, the form and the critical conditions of crack initiation by adopting theoretical derivation and numerical experiments methods are researched in this article. Maximum circumferential stress criterion and modified Griffith's criterion are utilized to derive the expressions for crack initiation angle and fracture criterion. Moreover, the PFC 3D , numerical simulation software, is used to verify the results of theoretical research and the research on the generation process of shear fracture zone and the number of microcracks and their distribution law. The results show that the crack initiation angle u 0 and critical conditions of crack initiation correlate with some factors, such as crack inclination angle b, coefficient of friction m, and the ratio of normal stress to shear stress s 1 /t x . When b is less than or equal to 90°, the deviation between the theoretical result of crack initiation angle and actual result is small; when the value of Mode I fracture toughness K IC is accurate, the crack criterion derived is reliable when b is less than or equal to 120°. The friction between cracks restricts the compression-shear failure on the surface of crack. The ratio of shear stress required for crack initiation to peak shear stress in the model decreases with the normal stress increased. At the crack initiation stage, when the increase in microcracks is relatively slow, the shear fracture zone is thin and when the increase in microcracks becomes rapid, shear fracture zone becomes thick at the peak stage. The shear strength is proportional to the number of microcracks in the model.

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“…The commonly used rock strength theories include the maximum normal stress theory, the maximum shear stress theory, the octahedral shear stress theory, the Mohr theory, the Griffith theory, and the Lode–Bishop theory. In addition, the rock failure criteria encompass the Mohr–Coulomb criterion, the D–P criterion, empirical failure criteria, and empirical criteria for the propagation of compression-shear cracks [ 17 , 18 ]. However, these theories and criteria have their own applicability conditions and cannot fully explain the deformation and failure modes of macroscopic rocks.…”

Section: Introductionmentioning

confidence: 99%

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

Zhu

Wang

2023

Materials

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The generation of rock mass disasters in underground engineering essentially arises from the disruption of the original three-dimensional stress equilibrium of the rock mass caused by excavation and other activities, leading to the redistribution of stress fields. During the excavation process, the engineering rock mass undergoes complex dynamic stress equilibrium processes involving loading and unloading. This equilibrium process promotes the nucleation, initiation, and propagation of pre-existing cracks in the surrounding rock, resulting in changes in the internal structure of the rock mass and a weakening of its strength. Eventually, this localized cracking extends to global failure. In order to understand the current status better and study the development trends in the study of crack propagation and evolution in defective rock, this study conducts a bibliometric analysis of 288 articles from the Web of Science Core Collection database using CiteSpace software (version 6.1.R4). The results indicate an increasing trend in the annual publication output, characterized by two phases of emergence and rapid development. The countries of China, the United States, and Iran have the highest publication output in this field. The most frequently cited journals include INT J ROCK MECH MIN, ENG FRACT MECH, and ROCK MECH ROCK ENG. This study provides a comprehensive analysis of the current status and development trends in the research on the propagation and evolution of pre-existing cracks. This study enhances the comprehension of crucial aspects of crack propagation and evolution in rock materials with defects. Moreover, it opens up new possibilities for future investigations and holds promising implications for researchers and practitioners in the field.

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The Mechanism Investigation on Propagation and Coalescence Pattern of Three Internal Plane Flaws in Brittle Materials

Cited by 9 publications

References 3 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

Research on crack initiation mechanism and fracture criterion of rock-type materials under compression–shear stress

Research Progress and Hot Spot Analysis of the Propagation and Evolution Law of Prefabricated Cracks in Defective Rocks

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