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Article: Microscopic Characterization of Tensile and Shear Fracturing in Progressive Failure in Marble
Title | Microscopic Characterization of Tensile and Shear Fracturing in Progressive Failure in Marble |
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Authors | |
Keywords | Tensile fracture Shear fracture Transgranular crack Grain boundary crack Microcrack Carrara marble |
Issue Date | 2018 |
Publisher | American Geophysical Union, co-published with Wiley. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/hub/jgr/journal/10.1002/(ISSN)2169-9356/ |
Citation | Journal of Geophysical Research: Solid Earth, 2018, v. 123 n. 1, p. 204-225 How to Cite? |
Abstract | Compression‐induced tensile and shear fractures were reported to be the two fundamental fracture types in rock fracturing tests. This study investigates such tensile and shear fracturing process in marble specimens containing two different flaw configurations. Observations first reveal that the development of a tensile fracture is distinct from shear fracture with respect to their nucleation, propagation, and eventual formation in macroscale. Second, transgranular cracks and grain‐scale spallings become increasingly abundant in shear fractures as loading increases, which is almost not observed in tensile fractures. Third, one or some dominant extensional microcracks are commonly observed in the center of tensile fractures, while such development of microcracks is almost absent in shear fractures. Microcracks are generally of a length comparable to grain size and distribute uniformly within the damage zone of the shear fracture. Fourth, the width of densely damaged zone in the shear fracture is nearly 10 times of that in the tensile fracture. Quantitative measurement on microcrack density suggests that (1) microcrack density in tensile and shear fractures display distinct characteristics with increasing loading, (2) transgranular crack density in the shear fracture decreases logarithmically with the distance away from the shear fracture center, and (3) whatever the fracture type, the anisotropy can only be observed for transgranular cracks with a large density, which partially explains why microcrack anisotropy usually tends to be unobvious until approaching peak stress in specimens undergoing brittle failure. Microcracking characteristics observed in this work likely shed light to some phenomena and conclusions generalized in seismological studies. |
Persistent Identifier | http://hdl.handle.net/10722/264065 |
ISSN | 2023 Impact Factor: 3.9 2023 SCImago Journal Rankings: 1.690 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Cheng, Y | - |
dc.contributor.author | Wong, LNY | - |
dc.date.accessioned | 2018-10-22T07:48:56Z | - |
dc.date.available | 2018-10-22T07:48:56Z | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | Journal of Geophysical Research: Solid Earth, 2018, v. 123 n. 1, p. 204-225 | - |
dc.identifier.issn | 2169-9313 | - |
dc.identifier.uri | http://hdl.handle.net/10722/264065 | - |
dc.description.abstract | Compression‐induced tensile and shear fractures were reported to be the two fundamental fracture types in rock fracturing tests. This study investigates such tensile and shear fracturing process in marble specimens containing two different flaw configurations. Observations first reveal that the development of a tensile fracture is distinct from shear fracture with respect to their nucleation, propagation, and eventual formation in macroscale. Second, transgranular cracks and grain‐scale spallings become increasingly abundant in shear fractures as loading increases, which is almost not observed in tensile fractures. Third, one or some dominant extensional microcracks are commonly observed in the center of tensile fractures, while such development of microcracks is almost absent in shear fractures. Microcracks are generally of a length comparable to grain size and distribute uniformly within the damage zone of the shear fracture. Fourth, the width of densely damaged zone in the shear fracture is nearly 10 times of that in the tensile fracture. Quantitative measurement on microcrack density suggests that (1) microcrack density in tensile and shear fractures display distinct characteristics with increasing loading, (2) transgranular crack density in the shear fracture decreases logarithmically with the distance away from the shear fracture center, and (3) whatever the fracture type, the anisotropy can only be observed for transgranular cracks with a large density, which partially explains why microcrack anisotropy usually tends to be unobvious until approaching peak stress in specimens undergoing brittle failure. Microcracking characteristics observed in this work likely shed light to some phenomena and conclusions generalized in seismological studies. | - |
dc.language | eng | - |
dc.publisher | American Geophysical Union, co-published with Wiley. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/hub/jgr/journal/10.1002/(ISSN)2169-9356/ | - |
dc.relation.ispartof | Journal of Geophysical Research: Solid Earth | - |
dc.rights | ©2017. American Geophysical Union. All Rights Reserved. This article is available at https://doi.org/10.1002/2017JB014581. | - |
dc.subject | Tensile fracture | - |
dc.subject | Shear fracture | - |
dc.subject | Transgranular crack | - |
dc.subject | Grain boundary crack | - |
dc.subject | Microcrack | - |
dc.subject | Carrara marble | - |
dc.title | Microscopic Characterization of Tensile and Shear Fracturing in Progressive Failure in Marble | - |
dc.type | Article | - |
dc.identifier.email | Wong, LNY: lnywong@hku.hk | - |
dc.identifier.authority | Wong, LNY=rp02069 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1002/2017JB014581 | - |
dc.identifier.scopus | eid_2-s2.0-85040709566 | - |
dc.identifier.hkuros | 293894 | - |
dc.identifier.volume | 123 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | 204 | - |
dc.identifier.epage | 225 | - |
dc.identifier.isi | WOS:000426132600012 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 2169-9313 | - |