Discrete modelling of electrical transfer in multi-contact systems

Bourbatache, Khaled; Guessasma, Mohamed; Bellenger, Emmanuel; Tekaya, Aymen

doi:10.1007/s10035-011-0307-y

Cited by 22 publications

(19 citation statements)

References 25 publications

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“…The bulk density of this sample was 0.786 g/cm 3 , thus with 42.9% inter-particle porosity. This is henceforth called a skeleton sample, as it is believed that it makes the backbone of the particle bed of all fractions.…”

Section: Vibrated Bulk Densitymentioning

confidence: 92%

“…As given in Table 4, due to the absence of fine particles, the skeleton sample (S5) has an expected low VBD of 0.786 g/cm 3 . The standard recipe sample, however, has a quite high density of 0.955 g/cm 3 . In S1, the entire −8+14 mesh fraction has been removed and the content of large particles has been almost doubled.…”

Section: −8+14mentioning

confidence: 99%

“…Packing problems become even more complex when dealing with irregular shape particles. Electrical current transfer in granular media has also considerable importance in a variety of applications such as electronics, metallurgical processes, railway transportation, and geology [3].…”

Section: Introductionmentioning

confidence: 99%

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Discrete Element Method Investigation of Bulk Density and Electrical Resistivity of Calcined Coke Mixes

Majidi

Rouget

Fafard

et al. 2017

Metals

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Abstract:Packing density and electrical resistivity of particles assemblies are important factors for a variety of applications of granular materials. In the present work, a three-dimensional imaging technique is coupled with the discrete element method (DEM) to model anode grade calcined coke particles. Three-dimensional DEM models of samples with different size distribution of particles were studied to obtain the inter-particle contact information. As the content of fine particles increased, a higher inter-particle contact density and smaller average contact radius was observed in the samples. Confronting the DEM data and experimental measurements of electrical resistivity showed the simultaneous effects of packing density and contact density. Samples with higher contact density and smaller contact radius in general held high electrical resistivities. However, if increasing the contact density does not modify contacts between large particles, this will have a positive effect on packing density, so a lower electrical resistivity was obtained.

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Section: Vibrated Bulk Densitymentioning

confidence: 92%

Section: −8+14mentioning

confidence: 99%

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Discrete Element Method Investigation of Bulk Density and Electrical Resistivity of Calcined Coke Mixes

Majidi

Rouget

Fafard

et al. 2017

Metals

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“…The analogy with damped- springs is commonly used as shown in [14,15]. The designation "discrete element" recalls that the model comes from granular media [6]. The ball bearing is considered as a ball chain.…”

Section: Discrete Modeling Of a Ball Bearingmentioning

confidence: 99%

“…Previous work has shown that the voltage-current characteristics of a static bearing describe a hysteresis. This effect is attributed to Branly's effect [5] which is also manifested in a metallic granular medium [6][7][8]. This unconventional approach attempts to measure the electrical resistance of the ball bearing in operation.…”

Section: Introductionmentioning

confidence: 99%

Electromechanical modeling by DEM for assessing internal ball bearing loading

Machado¹,

Guessasma²,

Bellenger³

2015

Mechanism and Machine Theory

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Discrete element model for effective electrical conductivity of spark plasma sintered porous materials

Nisar,

Rojek,

Nosewicz

et al. 2024

Comp. Part. Mech.

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This paper aims to analyse electrical conduction in partially sintered porous materials using an original resistor network model within discrete element framework. The model is based on sintering geometry, where two particles are connected via neck. Particle-to-particle conductance depends on neck size in sintered materials. Therefore, accurate evaluation of neck size is essential to determine conductance. The neck size was determined using volume preservation criterion. Additionally, grain boundary correction factor was introduced to compensate for any non-physical overlaps between particles, particularly at higher densification. Furthermore, grain boundary resistance was added to account for the porosity within necks. For numerical analysis, the DEM sample was generated using real particle size distribution, ensuring a heterogeneous and realistic microstructure characterized by a maximum-to-minimum particle diameter ratio of 15. The DEM sample was subjected to hot press simulation to obtain geometries with different porosity levels. These representative geometries were used to simulate current flow and determine effective electrical conductivity as a function of porosity. The discrete element model (DEM) was validated using experimentally measured electrical conductivities of porous NiAl samples manufactured using spark plasma sintering (SPS). The numerical results were in close agreement with the experimental results, hence proving the accuracy of the model. The model can be used for microscopic analysis and can also be coupled with sintering models to evaluate effective properties during the sintering process.

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Discrete modelling of electrical transfer in multi-contact systems

Cited by 22 publications

References 25 publications

Discrete Element Method Investigation of Bulk Density and Electrical Resistivity of Calcined Coke Mixes

Discrete Element Method Investigation of Bulk Density and Electrical Resistivity of Calcined Coke Mixes

Electromechanical modeling by DEM for assessing internal ball bearing loading

Discrete element model for effective electrical conductivity of spark plasma sintered porous materials

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