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Article: Effects of dynamic fragmentation on the impact force exerted on rigid barrier: centrifuge modelling

TitleEffects of dynamic fragmentation on the impact force exerted on rigid barrier: centrifuge modelling
Authors
Keywordsbi-dispersity
dynamic fragmentation
impact
rigid barrier
centrifuge modelling
Issue Date2019
PublisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgj
Citation
Canadian Geotechnical Journal, 2019, v. 56 n. 9, p. 1215-1224 How to Cite?
AbstractBi-dispersity is a prerequisite for grain-size segregation, which transports the largest particles to the flow front. These large and inertial particles can fragment upon impacting a barrier. The amount of fragmentation during impact strongly influences the force exerted on a rigid barrier. Centrifuge modelling was adopted to replicate the stresses for studying the effects of bi-dispersity in a granular assembly and dynamic fragmentation on the impact force exerted on a model rigid barrier. To study the effects of bi-dispersity, the ratio between the diameters of small and large particles (δs/δl), characterizing the particle-size distribution (PSD), was varied as 0.08, 0.26, and 0.56. The volume fraction of the large particles was kept constant. A δs/δl tending towards unity characterizes inertial flow that exerts sharp impulses, and a diminishing δs/δl characterizes the progressive attenuation of these sharp impulses by the small particles. Flows dominated by grain-contact stresses (δs/δl < 0.26), as characterized by the Savage number, are effective at attenuating dispersive stresses of the large particles, which are responsible for reducing dynamic fragmentation. By contrast, flows dominated by grain-inertial stresses (δs/δl > 0.26) exhibit up to 66% more impulses and 4.3 times more fragmentation. Dynamic fragmentation of bi-disperse flows impacting a rigid barrier can dissipate about 30% of the total flow energy.
Persistent Identifierhttp://hdl.handle.net/10722/284041
ISSN
2019 Impact Factor: 2.802
2015 SCImago Journal Rankings: 2.093

 

DC FieldValueLanguage
dc.contributor.authorNg, CWW-
dc.contributor.authorChoi, CE-
dc.contributor.authorCheung, DKH-
dc.contributor.authorCui, Y-
dc.date.accessioned2020-07-20T05:55:38Z-
dc.date.available2020-07-20T05:55:38Z-
dc.date.issued2019-
dc.identifier.citationCanadian Geotechnical Journal, 2019, v. 56 n. 9, p. 1215-1224-
dc.identifier.issn0008-3674-
dc.identifier.urihttp://hdl.handle.net/10722/284041-
dc.description.abstractBi-dispersity is a prerequisite for grain-size segregation, which transports the largest particles to the flow front. These large and inertial particles can fragment upon impacting a barrier. The amount of fragmentation during impact strongly influences the force exerted on a rigid barrier. Centrifuge modelling was adopted to replicate the stresses for studying the effects of bi-dispersity in a granular assembly and dynamic fragmentation on the impact force exerted on a model rigid barrier. To study the effects of bi-dispersity, the ratio between the diameters of small and large particles (δs/δl), characterizing the particle-size distribution (PSD), was varied as 0.08, 0.26, and 0.56. The volume fraction of the large particles was kept constant. A δs/δl tending towards unity characterizes inertial flow that exerts sharp impulses, and a diminishing δs/δl characterizes the progressive attenuation of these sharp impulses by the small particles. Flows dominated by grain-contact stresses (δs/δl < 0.26), as characterized by the Savage number, are effective at attenuating dispersive stresses of the large particles, which are responsible for reducing dynamic fragmentation. By contrast, flows dominated by grain-inertial stresses (δs/δl > 0.26) exhibit up to 66% more impulses and 4.3 times more fragmentation. Dynamic fragmentation of bi-disperse flows impacting a rigid barrier can dissipate about 30% of the total flow energy.-
dc.languageeng-
dc.publisherNRC Research Press. The Journal's web site is located at http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_desc_e?cgj-
dc.relation.ispartofCanadian Geotechnical Journal-
dc.rightsCanadian Geotechnical Journal. Copyright © NRC Research Press.-
dc.subjectbi-dispersity-
dc.subjectdynamic fragmentation-
dc.subjectimpact-
dc.subjectrigid barrier-
dc.subjectcentrifuge modelling-
dc.titleEffects of dynamic fragmentation on the impact force exerted on rigid barrier: centrifuge modelling-
dc.typeArticle-
dc.identifier.emailChoi, CE: cechoi@hku.hk-
dc.identifier.authorityChoi, CE=rp02576-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1139/cgj-2018-0092-
dc.identifier.scopuseid_2-s2.0-85072055595-
dc.identifier.hkuros311426-
dc.identifier.volume56-
dc.identifier.issue9-
dc.identifier.spage1215-
dc.identifier.epage1224-
dc.publisher.placeCanada-

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