The roles of the reversibility and irreversibility of capillary bonds on the impact dynamics of agglomerates

Vo, Tam; Nguyen, Trung‐Kien

doi:10.1007/s11440-022-01577-7

Cited by 7 publications

(3 citation statements)

References 57 publications

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“…In order to analyze the compressive strength of wet granules under the diametrical compression, we calculate the mean vertical stress σ zz , determined by considering the stress tensor of the granules during the test. The mean vertical stress σ zz is obtained by considering z-components of the force vectors that combining all normal contact forces, capillary cohesion forces, and the tangential contact forces and the branch vectors joining centers between two particles in contacts [33], as given by the following expression:…”

Section: Numerical Simulationmentioning

confidence: 99%

Effects of the size polydispersity and friction coefficient on the compressive strength of wet granular materials

Nguyen

2023

STCE

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We numerically study the effects of the size polydispersity and the friction coefficient on the compressive strength of wet granules under a diametrical compression test by using discrete element simulations. The nu-merical method is coupled with the capillary cohesion law which is enhanced by the cohesive forces between grains in the pendular regime. The wet granules are composed of primary spherical particles whose size poly-dispersity is varied from1 to 10 and the friction coefficient between grains is varied from0.1 to 1.0. By applying a constant compression velocity on the top plate in quasi-static regime, the granule is deformed but does not abruptly rupture due to the cohesive effects between grains and the rearrangement of primary particles. This no abrupt rupture is characterized by the appearance of the peak compressive stress in a long vertical strain before the onset failure of the granule. The compressive strength of the granule increases with increasing the friction coefficient for all cases of the size polydispersity but seemly declines for low values of the size polydispersity and almost level-off for high-size polydispersity with the friction coefficient larger than 0.5.

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Section: Numerical Simulationmentioning

confidence: 99%

Effects of the size polydispersity and friction coefficient on the compressive strength of wet granular materials

Nguyen

2023

STCE

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“…4. As an in-house Discrete Element Method (DEM) code program, which is originally built by P. Mutabaruka, then developed and improved by the authors to investigate the physical and mechanical responses of granular materials in nature and industry [12][13][14]. In DEM, each grain is considered as rigid particle and interacts with its surrounding particles under the frictional elastic interaction force law [15].…”

Section: Introductionmentioning

confidence: 99%

Linking dynamics between anchors and granular materials

Vo,

Nguyen

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The research quantitatively explores the linking properties between the circular plate anchor and the granular assembly during the failure process under the subject of a specified pullout force given to the anchor using three-dimensional discrete particle simulations. This circular anchor is created as a hard cluster of spherical grains and is initially buried at a depth in the granular assembly. The numerical method is constructed based on the frictional interaction force law. The linking dynamic is characterized by the variation of the drag force acting on such anchor due to interaction with grains at the bottom of the frustum which is formed during the uplifting movement of the anchor. The results show that the drag force acting on the anchor first reaches a nearly constant value corresponding to the loading phenomenon at small anchor movement, reflecting the plastic deformation of granular bed as a result of particle rearrangement, and then fluctuates in a wide range, this range increases with increasing the anchor movement as a result of the unloading/reloading events. These loading/unloading/reloading events provide evidence for the linking properties between the anchor movement and granular assembly, which are highlighted by the density and intensity of force network within the frustum.

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“…Modeling the behavior of granular materials is to reflect their physical and mechanical characteristics in an overall response. Several approaches have been proposed in the literature for this purpose, including the Finite Element Method (FEM), Discrete Element Method (DEM), Smoothed-particle hydrodynamics (SPH), or coupling with other methods [8][9][10][11][12][13]. Since its first application in the 1970s, DEM has become a powerful tool for investigating the behavior of granular materials, mainly due to its ability to represent their discrete nature.…”

Section: Introductionmentioning

confidence: 99%

Effects of intergranular friction and grain size distributions on the initial void ratio of granular sample

Nguyen

2023

STCE

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This paper investigates the influence of intergranular friction and grain size distributions on the initial void ratio of a granular sample subjected to isotropic compression loading. In the field of geomechanics, besides the loading path and evolution of microscopic properties, the initial void ratio is a crucial and key factor that governs the mechanical behavior of geomaterials. By using Discrete Element Model (DEM) performed on an idealized 2D assembly of disks, this study demonstrates that the initial void ratio can be affected by several parameters during isotropic compression stage. By varying a wide range of intergranular coefficients of friction and grain size distributions, our numerical results suggest that increasing the intergranular coefficient of friction during the isotropic compression phase leads to looser samples. Furthermore, when the diversity of grain sizes is rich, smaller grains can move and occupy voids, thereby increasing the density of the granular sample. A power-lawrelationship is then proposed that connects the minimum void ratio and the diversity degree of the sample.

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The roles of the reversibility and irreversibility of capillary bonds on the impact dynamics of agglomerates

Cited by 7 publications

References 57 publications

Effects of the size polydispersity and friction coefficient on the compressive strength of wet granular materials

Effects of the size polydispersity and friction coefficient on the compressive strength of wet granular materials

Linking dynamics between anchors and granular materials

Effects of intergranular friction and grain size distributions on the initial void ratio of granular sample

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