Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression
Abstract 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. Howeve...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2023-03-01
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| Series: | Deep Underground Science and Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/dug2.12037 |
| _version_ | 1797825289178316800 |
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| author | Jiyun Xu Hanzhang Li Haijun Wang Lei Tang |
| author_facet | Jiyun Xu Hanzhang Li Haijun Wang Lei Tang |
| author_sort | Jiyun Xu |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-03-13T10:51:49Z |
| format | Article |
| id | doaj.art-ff503ac9b62a4e3fa583d9fdc2943a6c |
| institution | Directory Open Access Journal |
| issn | 2097-0668 2770-1328 |
| language | English |
| last_indexed | 2024-03-13T10:51:49Z |
| publishDate | 2023-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Deep Underground Science and Engineering |
| spelling | doaj.art-ff503ac9b62a4e3fa583d9fdc2943a6c2023-05-17T12:50:26ZengWileyDeep Underground Science and Engineering2097-06682770-13282023-03-0121375110.1002/dug2.12037Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compressionJiyun Xu0Hanzhang Li1Haijun Wang2Lei Tang3State Key Laboratory of Hydrology‐Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute Nanjing ChinaState Key Laboratory of Hydrology‐Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute Nanjing ChinaState Key Laboratory of Hydrology‐Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute Nanjing ChinaState Key Laboratory of Hydrology‐Water Resources and Hydraulic Engineering Nanjing Hydraulic Research Institute Nanjing ChinaAbstract 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.https://doi.org/10.1002/dug2.120373D‐ILCbrittle materialsinternal crackpenny‐shaped crackrock fractureuniaxial compression |
| spellingShingle | Jiyun Xu Hanzhang Li Haijun Wang Lei Tang Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression Deep Underground Science and Engineering 3D‐ILC brittle materials internal crack penny‐shaped crack rock fracture uniaxial compression |
| title | Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression |
| title_full | Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression |
| title_fullStr | Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression |
| title_full_unstemmed | Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression |
| title_short | Experimental study on 3D internal penny‐shaped crack propagation in brittle materials under uniaxial compression |
| title_sort | experimental study on 3d internal penny shaped crack propagation in brittle materials under uniaxial compression |
| topic | 3D‐ILC brittle materials internal crack penny‐shaped crack rock fracture uniaxial compression |
| url | https://doi.org/10.1002/dug2.12037 |
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