Effect of particle size distribution on micro- and macromechanical response of granular packings under compression

Wiącek, Joanna; Molenda, M.

doi:10.1016/j.ijsolstr.2014.06.029

Cited by 55 publications

(34 citation statements)

References 23 publications

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“…We observe that the bulk modulus decreases with polydispersity and the inter-particle frictions considered. This result is in agreement with those obtained in compressional three-dimensional granular packings [16,17,21], where denser packings are achieved since contact deformations and grains rearrangements occur during compression. Furthermore, Fig.2 shows that the mean coordination number decreases, while porosity reaches a maximum, for δ = 40%, to then decrease weakly as polydispersity and particle friction grow.…”

Section: Effect Of Polydispersity On Bulk Modulussupporting

confidence: 91%

“…Results reported previously, have shown that increasing polydispersity of a compacted granular system reduces slightly the bulk modulus [17,21]. A preliminary work [27] showed experimentally that the strongest force chains emerge at peak effective stiffness, evidencing a latent relation between both.…”

Section: Introductionmentioning

confidence: 72%

“…The effect of polydispersity on force fabric variables in granular packings have also been investigated, where mean coordination, porosity and grain mobilization change when the degree of polydispersity varies [16][17][18]. Furthermore, the force distribution is broader as the grain size span increases since a large population of grains support forces less than the average [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Reduction of the bulk modulus with polydispersity in noncohesive granular solids

Petit

Medina

2018

Phys. Rev. E

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We study the effect of grain polydispersity on the bulk modulus in noncohesive two-dimensional granular solids. Molecular dynamics simulations in two dimensions are used to describe polydisperse samples that reach a stationary limit after a number of hysteresis cycles. For stationary samples, we obtain that the packing with the highest polydispersity has the lowest bulk modulus. We compute the correlation between normal and tangential forces with grain size using the concept of branch vector or contact length. Classifying the contact lengths and forces by their size compared to the average length and average force, respectively, we find that strong normal and tangential forces are carried by large contact lengths, generally composed of at least one large grain. This behavior is more dominant as polydispersity increases, making force networks more anisotropic and removing the support, from small grains, in the loading direction thus reducing the bulk modulus of the granular pack. Our results for two dimensions describe qualitatively the results of three-dimensional experiments.

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Section: Effect Of Polydispersity On Bulk Modulussupporting

confidence: 91%

Section: Introductionmentioning

confidence: 72%

Section: Introductionmentioning

confidence: 99%

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Reduction of the bulk modulus with polydispersity in noncohesive granular solids

Petit

Medina

2018

Phys. Rev. E

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“…Energy dissipated in the collisions was proportional to the mass of the colliding bodies, resulting in greater energy dissipation in systems composed of larger granules. DEM simulations of uniaxial compression of polydisperse sphere packings, conducted by Wiącek and Molenda [19], have shown that a loss energy increased as the degree of particle size heterogeneity increased. It is well known that efficiency of industrial processes involving handling of granular materials significantly depends on dissipation of energy in system.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle size ratio and contribution of particle size fractions on micromechanics of uniaxially compressed binary sphere mixtures

2017

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This paper is an extension of the recent work of Wiącek (Granul Matter 18:42, 2016), wherein geometrical parameters of binary granular mixtures with various particle size ratio and contribution of the particle size fractions were investigated. In this study, a micromechanics of binary mixtures with various ratio of the diameter of small and large spheres and contribution of small particles was analyzed using discrete element simulations of confined uniaxial compression. The study addressed contact normal orientation distributions, global and partial contact force distributions and pressure distribution in packings of frictional spheres. Additionally, the effect of particle size ratio and contribution of particle size fractions on energy dissipation in granular mixtures was investigated. The particle size ratio in binary packings was chosen to prevent small particles from percolating through bedding. The bimodality of mixtures was found to have a strong effect on distribution of contact normal orientation and distribution of normal contact forces in binary mixtures. Stress transfer in binary packing was also determined by both, particle size ratio and volume fraction of small particles. Dissipation of energy was higher in mixtures with higher particle size ratios and decreased with increasing contribution of small spheres in system.

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“…In additional studies, Martin et al [113] analyzed particle rearrangement during powder compaction, and Wiacek and Molenda [114] investigated the effects of the particle size distributions on the response under compression.…”

Section: Die Filling and Tablet Compactionmentioning

confidence: 99%

Discrete Element Modeling of Solid Dosage Manufacturing Processes

Barrasso

Ramachandran

2016

Methods in Pharmacology and Toxicology

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Solid dosage manufacturing primarily involves powder process operations, such as mixing, granulation, and compaction. A model-based approach can be used to develop a better scientific understanding of these processes and implement Quality by Design. These models must predict the critical quality attributes of the product based on process parameters, equipment geometry, and material properties. Discrete element modeling (DEM) is often used to capture mechanistic, particle-scale information, such as velocity and force profiles. In this chapter, recent literature studies that use the DEM to model solid dosage manufacturing processes will be presented and discussed.

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Effect of particle size distribution on micro- and macromechanical response of granular packings under compression

Abstract: Please cite this article as: Wiącek, J., Molenda, M., Effect of particle size distribution on micro-and macromechanical response of granular packings under compression, International Journal of Solids and Structures (2014), doi: http:// dx.

Cited by 55 publications

References 23 publications

Reduction of the bulk modulus with polydispersity in noncohesive granular solids

Reduction of the bulk modulus with polydispersity in noncohesive granular solids

Effect of particle size ratio and contribution of particle size fractions on micromechanics of uniaxially compressed binary sphere mixtures

Discrete Element Modeling of Solid Dosage Manufacturing Processes

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