Modeling of Caked Contacts in DEMs

Brendel, Lothar; Pengiran, Y.; Röck, Michael; Wahl, M.; Bröckel, Ulrich

doi:10.1002/ceat.200600132

Cited by 7 publications

(2 citation statements)

References 6 publications

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“…Since effects like liquid and possibly permanent solid bridges are not subject of the present study, we refer to the detailed literature, see Refs. [5,9,19,20,24,68,69,74,87,88,90] and references therein.…”

Section: Normal Contact Modelingmentioning

confidence: 99%

Cohesive, frictional powders: contact models for tension

Luding¹

2008

Granular Matter

515

431

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The contacts between cohesive, frictional particles with sizes in the range 0.1-10 µm are the subject of this study. Discrete element model (DEM) simulations rely on realistic contact force models-however, too much details make both implementation and interpretation prohibitively difficult. A rather simple, objective contact model is presented, involving the physical properties of elastic-plastic repulsion, dissipation, adhesion, friction as well as rollingand torsion-resistance. This contact model allows to model bulk properties like friction, cohesion and yield-surfaces. Very loose packings and even fractal agglomerates have been reported in earlier work. The same model also allows for pressure-sintering and tensile strength tests as presented in this study.

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Section: Normal Contact Modelingmentioning

confidence: 99%

Cohesive, frictional powders: contact models for tension

Luding¹

2008

Granular Matter

515

431

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“…But also crystallizing solute material from surrounding solutions, biological, or chemical processes can increase the cohesion force in bulk powders with time. Although the microscopical formation, stressing and failure of solid bridges between particles has been studied in the past [3,4], macroscopic implications regarding structural changes have not yet been investigated. In this work we propose a simple time dependent cohesion force between two particles and present DEM simulations to elucidate the macroscopic behavior of a fine cohesive powder under biaxial deformation.…”

Section: Introductionmentioning

confidence: 99%

Simulation of sheared, caking powder

Weuster¹,

Brendel²,

Wolf³

2013

AIP Conference Proceedings

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Abstract. We introduce a visco-elastic contact model for DEM simulations, which takes caking into account and investigate the impacts of this time dependent inter particle cohesion force on the bulk behavior under biaxial deformation. Starting from the assumption that the cohesion force between two particles develops on a characteristic timescale t c , we show, that two regimes can be identified. If t c is small compared to the shear rateγ, full cohesion is reached within the typical contact duration. The cohesion strength remains homogeneous throughout the sample. However, if t c γ crystallization bridges at fluctuating contacts never fully recover. Heterogeneous cohesion forces and granules are the consequence.

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Modellierung der Verbackung von Schüttgütern

Brendel

2006

Chemie Ingenieur Technik

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KontaktkraftBetrachtet werden zwei miteinander verklebte Partikel mit festem Kontaktradius a zunächst im Gleichgewicht, davon wird eins ausgewählt und darauf ein körperfestes Koordinatensystem so gelegt, dass dessen z-Achse die Kontaktnormale bildet. Die y-Achse sei so gewählt, dass für eine (kleine) Verdrehungẽ du ≡ dũ des zweiten Teilchens (verursacht durch weitere an den beiden Teilchen angreifende Kräfte) gilt:ẽ Áẽ y 0. Anders gesagt, nachdem die Verdrehung in eine Torsion mit Winkel a um die Kontaktnormale und eine dazu senkrechte Verkippung mit Winkel b (die Reihenfolge spielt wegen der Kleinheit von df keine Rolle) zerlegt wurde, definiert die Achse der Verkippung die x-Achse, d. h. es ist:

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Modeling of Caked Contacts in DEMs

Cited by 7 publications

References 6 publications

Cohesive, frictional powders: contact models for tension

Cohesive, frictional powders: contact models for tension

Simulation of sheared, caking powder

Modellierung der Verbackung von Schüttgütern

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