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| Vo, Thanh-trung; Mutabaruka, Patrick; Delenne, Jean-yves; Nezamabadi, Saeid; Radjai, Farhang. |
| We investigate the mechanical behavior of wet granular agglomerates composed of spherical particles by means of molecular dynamics simulations. The capillary cohesion force is modeled as an attraction force at the contact between two particles and expressed as an explicit function of the gap and volume of the liquid bridge. We are interested in the effect of the friction coefficient between primary particles. The agglomerates are subjected to diametrical compression tests. We find that the deformation is ductile involving particle rearrangements. However, a well-defined stress peak is observed and the peak stress is used as a measure of the compressive strength of the agglomerate. The strength increases with friction coefficient but levels off at friction... |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00685/79694/82474.pdf |
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| Vo, Thanh Trung; Nezamabadi, Saeid; Mutabaruka, Patrick; Delenne, Jean-yves; Izard, Edouard; Pellenq, Roland; Radjai, Farhang. |
| In order to get insight into the wet agglomeration process, we numerically investigate the growth of a single granule inside a dense flow of an initially homogeneous distribution of wet and dry particles. The simulations are performed by means of the discrete element method and the binding liquid is assumed to be transported by the wet particles, which interact via capillary and viscous force laws. The granule size is found to be an exponential function of time, reflecting the conservation of the amount of liquid and the decrease of the number of available wet particles inside the flow during agglomeration. We analyze this behavior in terms of the accretion and erosion rates of wet particles for a range of different values of material parameters such as... |
| Tipo: Text |
Palavras-chave: Flowing Matter; Granular Materials. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00685/79689/82470.pdf |
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| Trung Vo, Thanh; Nezamabadi, Saeid; Mutabaruka, Patrick; Delenne, Jean-yves; Radjai, Farhang. |
| Granular flows are omnipresent in nature and industrial processes, but their rheological properties such as apparent friction and packing fraction are still elusive when inertial, cohesive and viscous interactions occur between particles in addition to frictional and elastic forces. Here we report on extensive particle dynamics simulations of such complex flows for a model granular system composed of perfectly rigid particles. We show that, when the apparent friction and packing fraction are normalized by their cohesion-dependent quasistatic values, they are governed by a single dimensionless number that, by virtue of stress additivity, accounts for all interactions. We also find that this dimensionless parameter, as a generalized inertial number,... |
| Tipo: Text |
Palavras-chave: Civil engineering; Colloids; Physics; Process chemistry; Rheology. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00685/79680/82460.pdf |
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