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Article: Numerical studies of the influence of microstructure on rock failure in uniaxial compression - Part II: Constraint, slenderness and size effect

TitleNumerical studies of the influence of microstructure on rock failure in uniaxial compression - Part II: Constraint, slenderness and size effect
Authors
Issue Date2000
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijrmms
Citation
International Journal Of Rock Mechanics And Mining Sciences, 2000, v. 37 n. 4, p. 571-583 How to Cite?
AbstractNumerical simulations of uniaxial compression have been conducted to evaluate the effects of the loading system and specimen geometry on the deformation and failure behavior of brittle and heterogeneous rock. This was done using the Rock Failure Process Analysis program (RFPA(2D)). Numerical model specimens with different Young's modulus ratios of platen to specimen (Ep/Es = 0, 0.1, 1, 2, and 10), different slenderness in terms of height to width ratios (H/W = 0.5, 0.67, 1, 1.5, and 3), and different sizes (H x W = 30 x 20, 100 x 67, 120 x 80, 150 x 100, and 190 x 127 mm) have been numerically analyzed. The numerical simulations not only qualitatively reproduce the experimentally observed pre- and post-peak failure phenomena of the loaded specimens, but also provide a quantitative evaluation of the influence of the parameters studied on the complete stress-strain curves and the strength characteristics. The results presented here indicate that a more ductile response is simulated and the peak strength increases when the end constraint increases. The crack patterns show that almost-vertical splitting cracks develop in specimens loaded with softer loading platens, and the well-known hour-glass failure mode develops in specimens loaded with stiffer loading platens. The peak stress sustained by a specimen decreases with increasing slenderness of the specimen. The pre-peak portion of the stress-strain curves shows no significant dependence on slenderness; however, the post-peak curves are highly dependent on the ratio of specimen height to width. As far as the effect of size is concerned, numerical results reveal a strength reduction with an increase in specimen size, whereas the change of the specimen size does not obviously change the failure patterns. (C) 2000 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/150170
ISSN
2015 Impact Factor: 2.01
2015 SCImago Journal Rankings: 2.134
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTang, CAen_US
dc.contributor.authorTham, LGen_US
dc.contributor.authorLee, PKKen_US
dc.contributor.authorTsui, Yen_US
dc.contributor.authorLiu, Hen_US
dc.date.accessioned2012-06-26T06:02:00Z-
dc.date.available2012-06-26T06:02:00Z-
dc.date.issued2000en_US
dc.identifier.citationInternational Journal Of Rock Mechanics And Mining Sciences, 2000, v. 37 n. 4, p. 571-583en_US
dc.identifier.issn1365-1609en_US
dc.identifier.urihttp://hdl.handle.net/10722/150170-
dc.description.abstractNumerical simulations of uniaxial compression have been conducted to evaluate the effects of the loading system and specimen geometry on the deformation and failure behavior of brittle and heterogeneous rock. This was done using the Rock Failure Process Analysis program (RFPA(2D)). Numerical model specimens with different Young's modulus ratios of platen to specimen (Ep/Es = 0, 0.1, 1, 2, and 10), different slenderness in terms of height to width ratios (H/W = 0.5, 0.67, 1, 1.5, and 3), and different sizes (H x W = 30 x 20, 100 x 67, 120 x 80, 150 x 100, and 190 x 127 mm) have been numerically analyzed. The numerical simulations not only qualitatively reproduce the experimentally observed pre- and post-peak failure phenomena of the loaded specimens, but also provide a quantitative evaluation of the influence of the parameters studied on the complete stress-strain curves and the strength characteristics. The results presented here indicate that a more ductile response is simulated and the peak strength increases when the end constraint increases. The crack patterns show that almost-vertical splitting cracks develop in specimens loaded with softer loading platens, and the well-known hour-glass failure mode develops in specimens loaded with stiffer loading platens. The peak stress sustained by a specimen decreases with increasing slenderness of the specimen. The pre-peak portion of the stress-strain curves shows no significant dependence on slenderness; however, the post-peak curves are highly dependent on the ratio of specimen height to width. As far as the effect of size is concerned, numerical results reveal a strength reduction with an increase in specimen size, whereas the change of the specimen size does not obviously change the failure patterns. (C) 2000 Elsevier Science Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/ijrmmsen_US
dc.relation.ispartofInternational Journal of Rock Mechanics and Mining Sciencesen_US
dc.titleNumerical studies of the influence of microstructure on rock failure in uniaxial compression - Part II: Constraint, slenderness and size effecten_US
dc.typeArticleen_US
dc.identifier.emailTham, LG:hrectlg@hkucc.hku.hken_US
dc.identifier.emailLee, PKK:hreclkk@hkucc.hku.hken_US
dc.identifier.authorityTham, LG=rp00176en_US
dc.identifier.authorityLee, PKK=rp00141en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S1365-1609(99)00122-7en_US
dc.identifier.scopuseid_2-s2.0-0034353206en_US
dc.identifier.hkuros57873-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034353206&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume37en_US
dc.identifier.issue4en_US
dc.identifier.spage571en_US
dc.identifier.epage583en_US
dc.identifier.isiWOS:000087509800002-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridTang, CA=7404394097en_US
dc.identifier.scopusauthoridTham, LG=7006213628en_US
dc.identifier.scopusauthoridLee, PKK=24522826500en_US
dc.identifier.scopusauthoridTsui, Y=7006760586en_US
dc.identifier.scopusauthoridLiu, H=8396192000en_US

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