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Article: Influence of grain size heterogeneity on strength and microcracking behavior of crystalline rocks

TitleInfluence of grain size heterogeneity on strength and microcracking behavior of crystalline rocks
Authors
KeywordsHeterogeneity
Grain‐based modeling approach
Microcracking behavior
Grain boundary microcrack
Intragrain microcrack
Issue Date2017
PublisherAmerican 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, 2017, v. 122 n. 2, p. 1054-1073 How to Cite?
AbstractThis study numerically investigates the influence of material heterogeneity on the strength and deformation behavior and the associated microcracking process of a felsic crystalline rock using a grain‐based modeling approach in two‐dimensional Particle Flow Code. By using a heterogeneity index defined in this study, the heterogeneity induced by variation of grain size distribution can be explicitly incorporated into the numerical specimen models quantitatively. Under compressive loading, the peak strength and the elastic modulus are found to increase as the numerical model gradually changes from heterogeneous to homogeneous, i.e., a decrease of heterogeneity index. Meanwhile, the number of grain boundary tensile cracks gradually decreases and the number of intragrain cracks increases at the moment of failure. However, the total number of generated microcracks seems not to be significantly influenced by heterogeneity. The orientation of grain boundary microcracks is mainly controlled by the geometry of assembled grain structure of the numerical specimen model, while the orientation of intragrain microcracks is to a large degree influenced by the confinement. In addition, the development of intragrain cracks (both tensile and shear) is much more favored in quartz than in other minerals. Under direct tensile loading, heterogeneity is found to have no significant influence on the simulated stress‐strain responses and rock strength. Only grain boundary tensile cracks are generated when the numerical models are loaded in direct tension, and the position of generated macroscopic fracture developed upon failure of the specimen is largely affected by heterogeneity.
Persistent Identifierhttp://hdl.handle.net/10722/248398
ISSN
2023 Impact Factor: 3.9
2023 SCImago Journal Rankings: 1.690
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPeng, J-
dc.contributor.authorWong, LNY-
dc.contributor.authorTeh, CI-
dc.date.accessioned2017-10-18T08:42:34Z-
dc.date.available2017-10-18T08:42:34Z-
dc.date.issued2017-
dc.identifier.citationJournal of Geophysical Research: Solid Earth, 2017, v. 122 n. 2, p. 1054-1073-
dc.identifier.issn2169-9313-
dc.identifier.urihttp://hdl.handle.net/10722/248398-
dc.description.abstractThis study numerically investigates the influence of material heterogeneity on the strength and deformation behavior and the associated microcracking process of a felsic crystalline rock using a grain‐based modeling approach in two‐dimensional Particle Flow Code. By using a heterogeneity index defined in this study, the heterogeneity induced by variation of grain size distribution can be explicitly incorporated into the numerical specimen models quantitatively. Under compressive loading, the peak strength and the elastic modulus are found to increase as the numerical model gradually changes from heterogeneous to homogeneous, i.e., a decrease of heterogeneity index. Meanwhile, the number of grain boundary tensile cracks gradually decreases and the number of intragrain cracks increases at the moment of failure. However, the total number of generated microcracks seems not to be significantly influenced by heterogeneity. The orientation of grain boundary microcracks is mainly controlled by the geometry of assembled grain structure of the numerical specimen model, while the orientation of intragrain microcracks is to a large degree influenced by the confinement. In addition, the development of intragrain cracks (both tensile and shear) is much more favored in quartz than in other minerals. Under direct tensile loading, heterogeneity is found to have no significant influence on the simulated stress‐strain responses and rock strength. Only grain boundary tensile cracks are generated when the numerical models are loaded in direct tension, and the position of generated macroscopic fracture developed upon failure of the specimen is largely affected by heterogeneity.-
dc.languageeng-
dc.publisherAmerican 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.ispartofJournal of Geophysical Research: Solid Earth-
dc.rights©2017. American Geophysical Union. All Rights Reserved. This article is available at https://doi.org/10.1002/2016JB013469.-
dc.subjectHeterogeneity-
dc.subjectGrain‐based modeling approach-
dc.subjectMicrocracking behavior-
dc.subjectGrain boundary microcrack-
dc.subjectIntragrain microcrack-
dc.titleInfluence of grain size heterogeneity on strength and microcracking behavior of crystalline rocks-
dc.typeArticle-
dc.identifier.emailWong, LNY: lnywong@hku.hk-
dc.identifier.authorityWong, LNY=rp02069-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1002/2016JB013469-
dc.identifier.scopuseid_2-s2.0-85013641965-
dc.identifier.hkuros280158-
dc.identifier.volume122-
dc.identifier.issue2-
dc.identifier.spage1054-
dc.identifier.epage1073-
dc.identifier.isiWOS:000396132200016-
dc.publisher.placeUnited States-
dc.identifier.issnl2169-9313-

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