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- Publisher Website: 10.1139/cgj-2018-0092
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Article: Effects of dynamic fragmentation on the impact force exerted on rigid barrier: centrifuge modelling
Title | Effects of dynamic fragmentation on the impact force exerted on rigid barrier: centrifuge modelling |
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Authors | |
Keywords | bi-dispersity dynamic fragmentation impact rigid barrier centrifuge modelling |
Issue Date | 2019 |
Publisher | NRC 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? |
Abstract | Bi-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 Identifier | http://hdl.handle.net/10722/284041 |
ISSN | 2023 Impact Factor: 3.0 2023 SCImago Journal Rankings: 1.513 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Ng, CWW | - |
dc.contributor.author | Choi, CE | - |
dc.contributor.author | Cheung, DKH | - |
dc.contributor.author | Cui, Y | - |
dc.date.accessioned | 2020-07-20T05:55:38Z | - |
dc.date.available | 2020-07-20T05:55:38Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Canadian Geotechnical Journal, 2019, v. 56 n. 9, p. 1215-1224 | - |
dc.identifier.issn | 0008-3674 | - |
dc.identifier.uri | http://hdl.handle.net/10722/284041 | - |
dc.description.abstract | Bi-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.language | eng | - |
dc.publisher | NRC 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.ispartof | Canadian Geotechnical Journal | - |
dc.rights | Canadian Geotechnical Journal. Copyright © NRC Research Press. | - |
dc.subject | bi-dispersity | - |
dc.subject | dynamic fragmentation | - |
dc.subject | impact | - |
dc.subject | rigid barrier | - |
dc.subject | centrifuge modelling | - |
dc.title | Effects of dynamic fragmentation on the impact force exerted on rigid barrier: centrifuge modelling | - |
dc.type | Article | - |
dc.identifier.email | Choi, CE: cechoi@hku.hk | - |
dc.identifier.authority | Choi, CE=rp02576 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1139/cgj-2018-0092 | - |
dc.identifier.scopus | eid_2-s2.0-85072055595 | - |
dc.identifier.hkuros | 311426 | - |
dc.identifier.volume | 56 | - |
dc.identifier.issue | 9 | - |
dc.identifier.spage | 1215 | - |
dc.identifier.epage | 1224 | - |
dc.identifier.isi | WOS:000484192300002 | - |
dc.publisher.place | Canada | - |
dc.identifier.issnl | 0008-3674 | - |