Discrete element modelling study of force distribution in a 3D pile of spherical particles

Horabik, J.; Parafiniuk, Piotr; Molenda, M.

doi:10.1016/j.powtec.2017.02.048

Cited by 20 publications

(11 citation statements)

References 44 publications

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“…For sandpiles constructed by the fixed funnel method (FFM) in the experiments, repose angles are respectively 34.3° and 35.4° with corresponding internal friction angles as 26.6° and 31.4°, which indicates that the repose angle increases with the increase of the internal friction angle within a certain range. Horabik et al [29] and George Hentschel [14] found that the repose angle increased with the increase of the particle-particle friction through the DEM simulations of 2-D and 3-D sandpiles. Horabik et al [29] found that the repose angle increased from 6.8° to 34.6° with the increase of particle-particle friction coefficient from 0 to 1.2 in the simulation.…”

Section: The Internal Friction Angle Is An Important Factor Affect-mentioning

confidence: 99%

“…Horabik et al [29] and George Hentschel [14] found that the repose angle increased with the increase of the particle-particle friction through the DEM simulations of 2-D and 3-D sandpiles. Horabik et al [29] found that the repose angle increased from 6.8° to 34.6° with the increase of particle-particle friction coefficient from 0 to 1.2 in the simulation. H. George E. Hentschel [14] further explored the relationship between the internal friction angle and the particleparticle friction coefficient and found that the internal friction angle increased from approximately 2° to 20° with the increase of particle-particle friction coefficient from 0.01 to 1.0.…”

Section: The Internal Friction Angle Is An Important Factor Affect-mentioning

confidence: 99%

“…In addition, photoelastic experiments [35,36] and the DEM simulations [14,29] both showed that the strong force chains have preferred inclined directions and tend to interweave into root-like force chain networks inside the pile constructed by the localized-source procedure. Therefore, there is an obvious inclined direction of stress propagation within the pile; the above-mentioned force chain network can be reproduced by DEM simulation (as shown in Fig.…”

Section: The Formation Mechanism Of the Stress Arch In The Sandpilementioning

confidence: 99%

“…A large number of studies have reported on the phenomenon and the cause of the stress dip underneath the sandpile. Some researchers believed that the stress dip phenomenon is related to the density heterogeneity [24] inside the sandpile and the particle-floor friction [14], and tried to describe and explain the phenomenon according to the granular elasticity [24], granular solid hydrodynamics(GSH) [25,26], fixed principal axes (FPA) method [17,27], the classical elastoplastic model considering granular dynamics and historical effect [28], the DEM simulation [14,16,29] and so on.…”

Section: Introductionmentioning

confidence: 99%

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The experiment and analysis of the repose angle and the stress arch-caused stress dip of the sandpile

Fang

Guo

et al. 2021

Granular Matter

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The repose angle and characteristics of the vertical stress distribution beneath the sandpile can help to understand the physical and mechanical properties of the granular matter and guide the foundation design of the rock-soil deposits such as the rockfill dam and the storage structures of granular materials. Researches previously found that the stress dip phenomenon exists in piles constructed by the localized-source procedure, where the maximum vertical stress underneath the pile deviates from the center. The repose angle and the stress dip are affected by many internal and external factors and exhibit highly nonlinear and sensitive characteristics. However, the variation of the repose angle and the stress dip with influencing factors and the cause of the stress dip have not yet been fully explored. Based on the localized-source conical sandpile experiments and the discrete element method (DEM) simulation analysis, this paper studied the influences of the internal friction angle of granular matter and the construction history (the slowly raising funnel method SRFM and the fixed funnel method FFM) on the repose angle and the vertical stress dip beneath the pile; while the formation mechanism of the stress dip phenomenon was analyzed. The experimental results showed that the repose angle, physically different from the internal friction angle, has a relatively larger value and is positively related to the internal friction angle in the sandpile constructed by the FFM; the localized-source procedure and the internal friction angle are conducive to the formation of the macroscopic force chain arch structure in granular matter, which produces the arching effect and the stress shielding effect and leads to the stress dip beneath the pile; and the ratio of the stress dip RSD decreases with the increase of the local impact effect and the internal friction angle.

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Section: The Internal Friction Angle Is An Important Factor Affect-mentioning

confidence: 99%

Section: The Internal Friction Angle Is An Important Factor Affect-mentioning

confidence: 99%

Section: The Formation Mechanism Of the Stress Arch In The Sandpilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The experiment and analysis of the repose angle and the stress arch-caused stress dip of the sandpile

Fang

Guo

et al. 2021

Granular Matter

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“…Based on the no-slip Hertz-Mindlin contact model and the matched calculation procedure, the particle's kinestate in each time step is obtained. In this work, the EDEM software package [34] was employed for the numerical simulation. However, before calculation, the conditions should be set in detail, particularly the microcontact parameters , s , and r , as described in Section 3.…”

Section: Dem Model Descriptionmentioning

confidence: 99%

Particle Directional Conveyance under Longitudinal Vibration by considering the Trough Surface Texture: Numerical Simulation Based on the Discrete Element Method

Chen

Jiang

Liu

2018

Shock and Vibration

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Particles can move directionally in a trough with finlike asperities under longitudinal vibrations. Here, we present an analysis of the particle conveyance mechanism and the influence of the asperity shape on the particle conveyance capacity by employing a numerical simulation based on the discrete element method (DEM). A dynamic-static matching method is proposed to characterize the three microcontact parameters in the simulation: the restitution coefficient, static friction coefficient, and rolling friction coefficient. The simulation shows that the asymmetric force induced by the finlike asperities and its cumulative effect over time lead to the particle directional conveyance. The conveyance velocity increases with increasing vibration time and is related to the median coordination number. The asperity height and slope inclination angles determine the trough shape and distance between two asperities directly. An undersized or oversized distance reduces the steady conveyance velocity. We find the optimal distance to be between one and two particle diameters.

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Calibration of DEM Parameters

Coetzee¹,

Katterfeld²

2023

Simulations in Bulk Solids Handling

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Discrete element modelling study of force distribution in a 3D pile of spherical particles

Cited by 20 publications

References 44 publications

The experiment and analysis of the repose angle and the stress arch-caused stress dip of the sandpile

The experiment and analysis of the repose angle and the stress arch-caused stress dip of the sandpile

Particle Directional Conveyance under Longitudinal Vibration by considering the Trough Surface Texture: Numerical Simulation Based on the Discrete Element Method

Calibration of DEM Parameters

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