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Article: Choosing a proper loading rate for bonded-particle model of intact rock

TitleChoosing a proper loading rate for bonded-particle model of intact rock
Authors
KeywordsTime step
Bonded-particle model (BPM)
Step strain rate
Loading rate
Rock
Issue Date2014
Citation
International Journal of Fracture, 2014, v. 189, n. 2, p. 163-179 How to Cite?
Abstract© 2014, Springer Science+Business Media Dordrecht. Bonded-particle model (BPM) is widely used to model geomaterials, in which calibration against the results from uniaxial/triaxial compressive tests, Brazilian tensile tests and shear tests have been commonly conducted. However, since different loading rates were used, it is difficult to assess the numerical results of these studies if the effects of the loading rate are ignored. This paper discusses the loading mechanisms associated with different loading rates in the BPM and examines the numerical outputs under these different rates. The results indicate that the time step is an important factor controlling the loading rate of the BPM and should be considered in addition to the velocity of the loading platen. The strain rate, which is usually employed to describe the loading rate in a physical test, cannot be used for the direct comparison of different numerical tests in PCF2D due to the time step. A proposed “step strain rate”, which considers the time step, is found to be more appropriate for comparing the loading velocity on specimens of varying sizes. Six different loading rates (0.005, 0.01, 0.02, 0.08, 0.2 and 0.6m/s) are employed in uniaxial compressive tests and Brazilian tests during this study. After comprehensive examinations, a maximum step strain rate of 1.1 × 10-8 step 1 is considered to be appropriate for quasi-static uniaxial compressive tests and Brazilian tests using the BPM.
Persistent Identifierhttp://hdl.handle.net/10722/214047
ISSN
2015 Impact Factor: 1.642
2015 SCImago Journal Rankings: 1.093

 

DC FieldValueLanguage
dc.contributor.authorZhang, Xiao Ping-
dc.contributor.authorWong, Louis Ngai Yuen-
dc.date.accessioned2015-08-19T13:41:39Z-
dc.date.available2015-08-19T13:41:39Z-
dc.date.issued2014-
dc.identifier.citationInternational Journal of Fracture, 2014, v. 189, n. 2, p. 163-179-
dc.identifier.issn0376-9429-
dc.identifier.urihttp://hdl.handle.net/10722/214047-
dc.description.abstract© 2014, Springer Science+Business Media Dordrecht. Bonded-particle model (BPM) is widely used to model geomaterials, in which calibration against the results from uniaxial/triaxial compressive tests, Brazilian tensile tests and shear tests have been commonly conducted. However, since different loading rates were used, it is difficult to assess the numerical results of these studies if the effects of the loading rate are ignored. This paper discusses the loading mechanisms associated with different loading rates in the BPM and examines the numerical outputs under these different rates. The results indicate that the time step is an important factor controlling the loading rate of the BPM and should be considered in addition to the velocity of the loading platen. The strain rate, which is usually employed to describe the loading rate in a physical test, cannot be used for the direct comparison of different numerical tests in PCF2D due to the time step. A proposed “step strain rate”, which considers the time step, is found to be more appropriate for comparing the loading velocity on specimens of varying sizes. Six different loading rates (0.005, 0.01, 0.02, 0.08, 0.2 and 0.6m/s) are employed in uniaxial compressive tests and Brazilian tests during this study. After comprehensive examinations, a maximum step strain rate of 1.1 × 10-8 step 1 is considered to be appropriate for quasi-static uniaxial compressive tests and Brazilian tests using the BPM.-
dc.languageeng-
dc.relation.ispartofInternational Journal of Fracture-
dc.subjectTime step-
dc.subjectBonded-particle model (BPM)-
dc.subjectStep strain rate-
dc.subjectLoading rate-
dc.subjectRock-
dc.titleChoosing a proper loading rate for bonded-particle model of intact rock-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s10704-014-9968-y-
dc.identifier.scopuseid_2-s2.0-84910016415-
dc.identifier.hkuros259198-
dc.identifier.volume189-
dc.identifier.issue2-
dc.identifier.spage163-
dc.identifier.epage179-
dc.identifier.eissn1573-2673-
dc.customcontrol.immutablesml 151012 - merged-

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