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Title:Influence of the virtual strain rate of noncohesive granular media on the discrete element method
Authors:ID Suzuki, Kiichi (Author)
ID Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Copyright holder)
Files:.pdf Acta_geotechnica_Slovenica_2015_Suzuki_Influence_of_the_virtual_strain_rate_of_noncohesive_granular_media_on_the_discrete_element_method.pdf (690,97 KB)
MD5: 54BF052C085AABEE9EF34038FBB219FA
PID: 20.500.12556/dkum/047233d5-6ed4-49b2-a172-fffca940773d
 
URL http://fgserver3.fg.um.si/journal-ags/2015-1/article-2.asp
 
Language:English
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
Abstract:The discrete element method (DEM) is an alternative computational tool for augmenting laboratory experiments because of its advantages in detailing macro- and micro-mechanical information. However, it should be noted that the DEM does not usually consider the convergence for each time step, because of the necessity for a huge calculation time. In that case, it indicates that the uniqueness of the solution is not guaranteed, except in the case of a very small strain rate, even though the behavior looks qualitatively reasonable. At first, the influence of strain rate among numerically imaginary input parameters for a non-cohesive material was investigated for monotonic, biaxial shear tests. Then, new findings were obtained from the DEM simulations. Strain rate has a significant influence on the shear behavior, especially after the peak strength of dense specimens. A quasi-static steady state exists, not a static steady state. The “strong” fabric ratio is closely related to the stress ratio. The maximum slip coordination number occurs around the phase-transformation ratio and the shear band appears around the peak strength.
Keywords:discrete element method, DEM, induced anisotropy, quasi-static steady state, strain rate, uniqueness
Publication status:Published
Publication version:Version of Record
Year of publishing:2015
Number of pages:str. 17-24
Numbering:Letn. 12, št. 1
PID:20.500.12556/DKUM-70828 New window
ISSN:1854-0171
UDC:550.3:624.131
ISSN on article:1854-0171
COBISS.SI-ID:284321536 New window
NUK URN:URN:SI:UM:DK:XFTZNTKB
Copyright:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
Publication date in DKUM:14.06.2018
Views:1144
Downloads:228
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
SUZUKI, Kiichi, 2015, Influence of the virtual strain rate of noncohesive granular media on the discrete element method. Acta geotechnica Slovenica [online]. 2015. Vol. 12, no. 1, p. 17–24. [Accessed 24 April 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=70828
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Record is a part of a journal

Title:Acta geotechnica Slovenica
Shortened title:Acta geotech. Slov.
Publisher:Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
ISSN:1854-0171
COBISS.SI-ID:215987712 New window

Secondary language

Language:Slovenian
Title:Vpliv virtualne stopnje specifične deformacije nekohezivnega zrnastega medija na metodo diskretnih elementov
Abstract:Metoda diskretnih elementov (DEM) je alternativno računalniško orodje za povečanje laboratorijskih eksperimentov, ki ima prednosti v detajliranju makro- in mikro-mehanskih informacij. Vendar pa je treba poudariti, da DEM po navadi ne upošteva konvergence za vsak časovni korak, ker je za izračun potreben ogromnem čas. V tem primeru to pomeni, da edinstvenost rešitve ni zagotovljena, razen v primeru zelo majhne stopnje specifičnih deformacij, čeprav obnašanje zgleda kakovostno smiselno. Najprej je bil preiskan vpliv stopnje specifičnih deformacij med številčnimi imaginarnimi vhodnimi parametri za nekohezivni material na monotonih, dvoosnih strižnih preizkusih. Nato so bile iz DEM simulacij pridobljene nove ugotovitve. Stopnja specifične deformacije ima pomemben vpliv na strižno obnašanje, še posebej po doseženi vrhnji rednosti vzorcev gostega gostotnega stanja. Ne obstaja statično stabilno stanje, ampak kvazi-statično stabilno stanje. "Močno" razmerje strukture je tesno povezano z napetostnim razmerjem. Največje število uskladitve zdrsa se pojavi okrog razmerja fazne transformacije, strižni pas se pojavi okoli vrhnje trdnosti.
Keywords:metoda diskretnih elementov, deformacije, stabilno stanje, preizkušanje, mehanika tal, geofizika, DEM, povzročena anizotropija, kvazi-statično stabilno stanje, stopnja specifične deformacije, edinstvenost


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  1. Acta geotechnica Slovenica

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