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Conference Paper: Influence of heterogeneity on direct tensile failure process of rocks and associated fractal characteristic of AE

TitleInfluence of heterogeneity on direct tensile failure process of rocks and associated fractal characteristic of AE
Authors
KeywordsDirect Tensile Test
Fractal
Heterogeneity
Numerical Simulation
Issue Date2007
PublisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.net
Citation
Key Engineering Materials, 2007, v. 353-358 PART 4, p. 2321-2324 How to Cite?
AbstractThe investigation on the behavior of a specimen under uniaxial tension and the process of microfracture attracts considerable interest with a view to understanding strength characterization of brittle materials. Little attention has been given to the detailed investigation of influence of heterogeneity of rock on the progressive failure leading to collapse in uniaxial tension. In this paper, a numerical code RFPA3D (Realistic Failure Process Analysis), newly developed based on a three-dimensional model, to simulate the fracture process and associated fractal characteristic of heterogeneous rock specimen subjected to direct uniaxial tension. Specimens with different heterogeneity are prepared to study tension failure. In a relatively homogeneous specimen, the macrocrack nucleates abruptly at a point in the specimen soon after reaching peak stress. In more heterogeneous specimens, microfractures are found to appear diffusely throughout the specimen, and the specimens show more ductile failure behavior and a higher residual strength. Development of fractal theory may provide more realistic representations of rock fracture. The fractal dimension of distributed AE is computed during the fracture process. For all specimens, the fractal dimension increases as the loading proceeds, and it reaches the peak value when macrocrack nucleates abruptly. It is also found that fractures scatter more diffusely in relatively heterogeneous specimens, and the fractal dimension has a smaller value. The homogenous rock specimens have flat and smooth rupture faces which are consistent with the fractal results.
DescriptionProgresses in fracture and strength of materials and structures : selected, peer reviewed papers from the Asian Pacific Conference [on] Fracture and Strength 2006 (APCFS'06) held at Sanya, Hainan Island, China during November 22-25, 2006
Persistent Identifierhttp://hdl.handle.net/10722/152152
ISSN
2005 Impact Factor: 0.224
2015 SCImago Journal Rankings: 0.173
References

 

DC FieldValueLanguage
dc.contributor.authorLiang, ZZen_US
dc.contributor.authorTang, CAen_US
dc.contributor.authorTham, LGen_US
dc.contributor.authorZhang, YBen_US
dc.contributor.authorXu, Ten_US
dc.date.accessioned2012-06-26T06:35:37Z-
dc.date.available2012-06-26T06:35:37Z-
dc.date.issued2007en_US
dc.identifier.citationKey Engineering Materials, 2007, v. 353-358 PART 4, p. 2321-2324en_US
dc.identifier.issn1013-9826en_US
dc.identifier.urihttp://hdl.handle.net/10722/152152-
dc.descriptionProgresses in fracture and strength of materials and structures : selected, peer reviewed papers from the Asian Pacific Conference [on] Fracture and Strength 2006 (APCFS'06) held at Sanya, Hainan Island, China during November 22-25, 2006-
dc.description.abstractThe investigation on the behavior of a specimen under uniaxial tension and the process of microfracture attracts considerable interest with a view to understanding strength characterization of brittle materials. Little attention has been given to the detailed investigation of influence of heterogeneity of rock on the progressive failure leading to collapse in uniaxial tension. In this paper, a numerical code RFPA3D (Realistic Failure Process Analysis), newly developed based on a three-dimensional model, to simulate the fracture process and associated fractal characteristic of heterogeneous rock specimen subjected to direct uniaxial tension. Specimens with different heterogeneity are prepared to study tension failure. In a relatively homogeneous specimen, the macrocrack nucleates abruptly at a point in the specimen soon after reaching peak stress. In more heterogeneous specimens, microfractures are found to appear diffusely throughout the specimen, and the specimens show more ductile failure behavior and a higher residual strength. Development of fractal theory may provide more realistic representations of rock fracture. The fractal dimension of distributed AE is computed during the fracture process. For all specimens, the fractal dimension increases as the loading proceeds, and it reaches the peak value when macrocrack nucleates abruptly. It is also found that fractures scatter more diffusely in relatively heterogeneous specimens, and the fractal dimension has a smaller value. The homogenous rock specimens have flat and smooth rupture faces which are consistent with the fractal results.en_US
dc.languageengen_US
dc.publisherTrans Tech Publications Ltd. The Journal's web site is located at http://www.scientific.neten_US
dc.relation.ispartofKey Engineering Materialsen_US
dc.subjectDirect Tensile Testen_US
dc.subjectFractalen_US
dc.subjectHeterogeneityen_US
dc.subjectNumerical Simulationen_US
dc.titleInfluence of heterogeneity on direct tensile failure process of rocks and associated fractal characteristic of AEen_US
dc.typeConference_Paperen_US
dc.identifier.emailTham, LG:hrectlg@hkucc.hku.hken_US
dc.identifier.authorityTham, LG=rp00176en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.4028/www.scientific.net/KEM.353-358.2321-
dc.identifier.scopuseid_2-s2.0-36049017990en_US
dc.identifier.hkuros212111-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-36049017990&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume353-358en_US
dc.identifier.issuePART 4en_US
dc.identifier.spage2321en_US
dc.identifier.epage2324en_US
dc.publisher.placeSwitzerlanden_US
dc.identifier.scopusauthoridLiang, ZZ=7402178194en_US
dc.identifier.scopusauthoridTang, CA=7404394097en_US
dc.identifier.scopusauthoridTham, LG=7006213628en_US
dc.identifier.scopusauthoridZhang, YB=7601310666en_US
dc.identifier.scopusauthoridXu, T=7401627148en_US

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