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Articoli di riviste sul tema "Particle packing"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Liu, Yuan-Yuan, Yaping Zhang, Yanrong Li, and Yi-Chen Guo. "Combined Influence of Particle Shape and Fabric on the Shear Behaviour of Granular Materials." Advances in Materials Science and Engineering 2022 (November 23, 2022): 1–15. http://dx.doi.org/10.1155/2022/5993323.

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The anisotropy feature is an important characteristic of granular materials in natural life and is caused by two facts: the anisotropy feature of particle shape, such as an elongated or flattened shape, and the anisotropy feature of the packing fabric, such as the preferable orientation of particle alignment. The discrete element method has been commonly used in the study of meso-mechanics of granular materials and is in our study to simulate the direct shear test with particles of various aspect ratios under different initial orientation alignment conditions for assessing the coupled influenc

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2

Iniyatova, Gulfairuz, Assiya Yermukhambetova, Aidana Boribayeva, and Boris Golman. "Approximate Packing of Binary Mixtures of Cylindrical Particles." Micromachines 14, no. 1 (2022): 36. http://dx.doi.org/10.3390/mi14010036.

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Particle packing plays an essential role in industry and chemical engineering. In this work, the discrete element method is used to generate the cylindrical particles and densify the binary cylindrical particle mixtures under the poured packing conditions. The influences of the aspect ratio and volume fraction of particles on the packing structure are measured by planar packing fraction. The Voronoi tessellation is used to quantify the porous structure of packing. The cumulative distribution functions of local packing fractions and the probability distributions of the reduced free volume of Vo

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3

Miao, Yinghao, Xin Liu, Yue Hou, Juan Li, Jiaqi Wu, and Linbing Wang. "Packing Characteristics of Aggregate with Consideration of Particle size and Morphology." Applied Sciences 9, no. 5 (2019): 869. http://dx.doi.org/10.3390/app9050869.

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The packing characteristics of aggregates are very important for aggregate blend design, which is closely related to the performance of mixtures. In this study, an indoor packing experiment was designed to investigate the behaviors of single-size particle packing and two-size particle packing. The effects of particle composition, particle size and size ratio, particle morphology on packing characteristics were also evaluated. Two kinds of aggregates (crushed stone and gravel) with significant morphological differences were selected for the test. The angularity of the aggregates was quantitativ

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4

Wiącek, Joanna, Mateusz Stasiak, and Jalal Kafashan. "Structural and Micromechanical Properties of Ternary Granular Packings: Effect of Particle Size Ratio and Number Fraction of Particle Size Classes." Materials 13, no. 2 (2020): 339. http://dx.doi.org/10.3390/ma13020339.

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The confined uniaxial tests of packings with discrete particle size distribution (PSD) were modeled with the discrete element method. Ternary packings of spheres with PSD uniform or nonuniform by number of particles were examined in three-dimensional (3D) system. The study addressed an effect of the particle size ratio and the particle size fraction on structural and micromechanical properties of mixtures. A study of packing structure included porosity and coordination numbers, while the investigation of micromechanical properties included distribution of normal contact forces and stress trans

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5

Jiang, Haoran, Reid Kawamoto, and Takashi Matsushima. "Exploring the combined effect of particle shape and friction on cell structures in granular packings via LS-DEM modeling." IOP Conference Series: Earth and Environmental Science 1330, no. 1 (2024): 012047. http://dx.doi.org/10.1088/1755-1315/1330/1/012047.

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Abstract To comprehensively understand and predict the macroscopic behavior of a granular system, one must consider not only the properties of individual particles but also the local structures. In this study, we prepare mechanically stable granular packings of super disks using the two-dimensional level set discrete element method (LS-DEM). We identify the cells, the irreducible loops enclosed by contacting particles, in the prepared granular packings and then analyze the statistics of these structures. We find the following. (1) The packing fraction or mean coordination number of studied sys

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6

Zhao, Tingting, Y. T. Feng, and Yuanqiang Tan. "Characterising 3D spherical packings by principal component analysis." Engineering Computations 37, no. 3 (2019): 1023–41. http://dx.doi.org/10.1108/ec-05-2019-0225.

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Purpose The purpose of this paper is to extend the previous study [Computer Methods in Applied Mechanics and Engineering 340: 70-89, 2018] on the development of a novel packing characterising system based on principal component analysis (PCA) to quantitatively reveal some fundamental features of spherical particle packings in three-dimensional. Design/methodology/approach Gaussian quadrature is adopted to obtain the volume matrix representation of a particle packing. Then, the digitalised image of the packing is obtained by converting cross-sectional images along one direction to column vector

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7

Amano, Yuto, Takashi Itoh, Hoshiaki Terao, and Naoyuki Kanetake. "Prediction of Packing Density of Milled Powder Based on Packing Simulation and Particle Shape Analysis." Materials Science Forum 534-536 (January 2007): 1621–24. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.1621.

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For precise property control of sintered products, it is important to know the powder characteristics, especially the packing density of the powder. In a previous work, we developed a packing simulation program that could make a packed bed of spherical particles having particle size distribution. In order to predict the packing density of the actual powder that consisted of nonspherical particles, we combined the packing simulation with a particle shape analysis. We investigated the influence of the particle size distribution of the powder on the packing density by executing the packing simula

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8

Sun, Shaobo, Huisu Chen, and Jianjun Lin. "A Universal Method for Modeling and Characterizing Non-Circular Packing Systems Based on n-Point Correlation Functions." Materials 15, no. 17 (2022): 5991. http://dx.doi.org/10.3390/ma15175991.

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A universal method for modeling and characterizing non-circular particles is developed. The n-point correlation functions (n = 1, 2 and 3) are efficiently computed with a GPU parallel computing procedure. An algorithm for dynamic packing of impenetrable non-circular particles is developed based on the fast estimation of overlap information using a one-point correlation function. The packing algorithm is independent of particle shape and proved to be reliable by examples of polygons and super-ellipses. In addition, penetrable packings are generated in an efficient and precise way. Using a two-p

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9

Dinger, Dennis R., and James E. Funk. "Particle-Packing Phenomena and Their Application in Materials Processing." MRS Bulletin 22, no. 12 (1997): 19–23. http://dx.doi.org/10.1557/s0883769400034692.

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Particle packing is directly controlled by the particle-size distribution of a material being processed. For this reason, particle packing is important to all particulate/fluid systems. After the solids fraction of a body is defined, interparticle chemistry controls how the body will pack and flow. A system of powders can never pack better than the maximum possible level defined by the particle-size distribution alone. Proper control of interparticle chemistry however can help achieve maximum packing, can be used to open the structure, and/or can be used to modify rheological or other process

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10

Wang, Yutao, Wei Deng, Zhaohui Huang, and Shuixiang Li. "Descriptor-free unsupervised learning method for local structure identification in particle packings." Journal of Chemical Physics 156, no. 15 (2022): 154504. http://dx.doi.org/10.1063/5.0088056.

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Local structure identification is of great importance in many scientific and engineering fields. However, mathematical and supervised learning methods mostly rely on specific descriptors of local structures and can only be applied to particular packing configurations. In this work, we propose an improved unsupervised learning method, which is descriptor-free, for local structure identification in particle packing. The point cloud is used as the input of the improved method, which directly comes from spatial positions of particles and does not rely on specific descriptors. The improved method c

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11

Chen, Yuan, Didier Imbault, and Pierre Dorémus. "Numerical Simulation of Cold Compaction of 3D Granular Packings." Materials Science Forum 534-536 (January 2007): 301–4. http://dx.doi.org/10.4028/www.scientific.net/msf.534-536.301.

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During cold compaction processes loose powder is pressed under tooling action in order to produce complex shaped engineering components. Here, the analysis of the plastic deformation of granular packings is of fundamental importance to the development of computer simulation models for industrial forming processes. Powders can be idealized by packing discrete particles, where each particle is a sphere meshed with finite elements. During pressing, particles are deformed by elastic-plastic hardening where friction is present at each contact. The pressing of an isolated particle followed by a body

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12

Guo, Ye, Xin Huang, and Bao Lin Zhu. "A Calculation Method for Packing Density of Powder in Paste with Continuous Grain Size Distribution." Key Engineering Materials 477 (April 2011): 125–31. http://dx.doi.org/10.4028/www.scientific.net/kem.477.125.

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By regarding the powder particles warpped with water film as compounded particles, the packing density of powder particles in actual paste system is transformed into the packing density of compounded partcles in imaginary dry-particle system. Based on Stovall Model, a calculation method for packing density of powder with continuous particle size distribution in paste is developed, and the parameters in the method are dentified by experiment. This calculation method could be used to simulate the packing density of cementitious materials such as cement, fine slag, and fly ashes.

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13

Roy, D. M., B. E. Scheetz, and M. R. Silsbee. "Processing of Optimized Cements and Concretes Via Particle Packing." MRS Bulletin 18, no. 3 (1993): 45–49. http://dx.doi.org/10.1557/s088376940004389x.

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It has been well-recognized for many years that the particle-size distributions of the cement and the grading of the aggregates play an important role in determining the properties and characteristics of cement and concrete products. DSP (densified with small particles) type cements and concretes, to a certain extent, MDF (macro-defect-free) cements, and optimized concretes are recently recognized outstanding examples of the application of this principle. The preset characteristics of the cementitious slurry are also strongly influenced by these factors. Both the workability of the fresh mater

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14

Lee, Jong-Heon, W. Jack Lackey, and James F. Benzel. "Ternary packing of SiC and diamond particles in ethanol." Journal of Materials Research 11, no. 11 (1996): 2804–10. http://dx.doi.org/10.1557/jmr.1996.0355.

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Particle packing techniques employing a liquid phase were used for preparation of dense disks of SiC and diamond particulates. Forty-one SiC and fifteen diamond compositions in the ternary-component particle systems were used to determine the optimum percentages of coarse, medium, and fine particles for achieving high packing densities: over 80% for SiC and over 62% for diamond. High packing densities were achieved without vibration by simply mixing the three size fractions in ethanol followed by stirring during the initial evaporation stage. The packing density results for SiC were successful

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15

Dodds, JohnA. "Particle packing characteristics." Powder Technology 61, no. 1 (1990): 101. http://dx.doi.org/10.1016/0032-5910(90)80071-6.

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16

Tung, K. L., Y. L. Chang, J. Y. Lai, C. H. Chang, and C. J. Chuang. "A CFD study of the deep bed filtration mechanism for submicron/nano-particle suspension." Water Science and Technology 50, no. 12 (2004): 255–64. http://dx.doi.org/10.2166/wst.2004.0721.

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The mechanism of the deep bed filtration for submicron and nano particles suspension was conducted by means of a force analysis on the suspended particles flow path through order-packed granular filter beds. The flow fields through the filter beds were calculated by using the commercial available CFD software - Fluent. Various types of granular packing structures, such as the simple cubic packing, bodycentered packing and face-centered packing structures were chosen for analysis. The motion of suspended particle of 2.967, 0.816, 0.460 and 0.050 μm in diameter, respectively, were tracked by con

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17

Wang, Dong, Nima Nejadsadeghi, Yan Li, Shashi Shekhar, Anil Misra, and Joshua A. Dijksman. "Rotational diffusion and rotational correlations in frictional amorphous disk packings under shear." Soft Matter 17, no. 34 (2021): 7844–52. http://dx.doi.org/10.1039/d1sm00525a.

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Particles in a packing will rotate when the packing is deformed. We find that rotations display diffusive dynamics set by particle friction and packing fraction. Rotations are spatially anticorrelated and directly indicative of the system pressure.

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18

LIU Zelin, YUAN Houfei, ZENG Zhikun, GE Zhuan, JIANG Yonglun, and WANG Yujie. "Structural Study of Binary Hard-sphere Packing under Tapping." Acta Physica Sinica 74, no. 13 (2025): 0. https://doi.org/10.7498/aps.74.20250232.

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The packing behavior and mechanical properties of granular materials play a critical role in various engineering applications, including materials handling, construction, and energy storage. Although significant progress has been made in understanding the packing of monodisperse spheres, real-world granular systems often exhibit polydispersity, where particles of different sizes coexist. Binary systems, where the particle size ratio is adjustable, serve as a simplified model to study the structural and dynamical properties of granular materials. However, most theoretical studies on binary syst

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19

Dandekar, Rahul, and P. L. Krapivsky. "Dynamic space packing." Journal of Statistical Mechanics: Theory and Experiment 2023, no. 10 (2023): 103403. http://dx.doi.org/10.1088/1742-5468/ad0223.

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Abstract Dynamic space packing (DSP) is a random process with sequential addition and removal of identical objects into space. In the lattice version, objects are particles occupying single lattice sites, and adding a particle to a lattice site leads to the removal of particles on neighboring sites. We show that the model is solvable and determine the steady-state occupancy, correlation functions, desorption probabilities, and other statistical features for the DSP of hyper-cubic lattices. We also solve a continuous DSP of balls into R d .

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20

Nagy, Endre. "On the three-phase mass transfer with solid particles adhered to the gas-liquid interface." Open Chemistry 1, no. 2 (2003): 160–77. http://dx.doi.org/10.2478/bf02479266.

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AbstractA heterogeneous, multi-layer mass transfer model is proposed for prediction of the effect of multi-layer packing of catalyst particles adhered to the gas-liquid interface. The behavior of the mass transfer rate with respect to the multi-layer packing, to the particle size and mass transfer coefficient without particles is discussed. It is shown that enhancement can be considerably increased by multi-layer packing compared to that of mono-layer packing, depending on the values of particle size and mass transfer coefficient. The predicted mass transfer rates using the proposed model was

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21

Sudduth, Richard D. "Optimum formulation derivation for the ultimate packing fraction using monodispersed particle sizes when optimizing suspension viscosities." Pigment & Resin Technology 48, no. 1 (2019): 45–56. http://dx.doi.org/10.1108/prt-01-2018-0006.

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Purpose The importance of maximizing the particle packing fraction in a suspension by maximizing average particle size ratio of D5/D1 has been adequately shown to be important as previously reported in the literature. This study aims to extend that analysis to include the best formulation approach to maximize the packing fraction with a minimum number of monodisperse particle sizes. Design/methodology/approach An existing model previously developed by this author was modified theoretically to optimize the ratio used between consecutive monodisperse particle sizes. This process was found to app

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22

Yu, Weixiao, Yun Li, Zhipeng Liang, Jiaxi Wu, Sudi Wang, and Yinghao Miao. "Laboratory Investigation of Packing Characteristics and Mechanical Performance of Aggregate Blend." Materials 18, no. 9 (2025): 1953. https://doi.org/10.3390/ma18091953.

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Aggregates are the main material forming the skeleton structure of asphalt mixtures and are of great importance to resist external load for asphalt pavement. This study analyzed the packing characteristics and mechanical performance of aggregate blend to provide a reference for improving the bearing capacity of asphalt mixtures. The single-size, two-size, and multi-size aggregate blends were chosen to conduct the laboratory packing and California bearing ratio (CBR) tests. Six particle sizes were selected to design the single-size aggregate blends. Six size combinations were included and vario

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23

Yang, Zon-Yee, and Shin-Chen Lo. "Describing the geometrical packing of gravelly cobble deposits using pair-correlation functions." Canadian Geotechnical Journal 38, no. 6 (2001): 1343–53. http://dx.doi.org/10.1139/t01-065.

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There is a close correlation between the mechanical behavior of gravelly cobbles and their geometrical fabric. In geotechnical engineering, the particle-size distribution curve is used to describe the particle gradation. However, a group of particles with the same particle-size distribution can result in several packing arrangements due to the different sedimentation processes. The particle-size distribution curve does not distinguish this characteristic. This study attempts to employ the pair-correlation function of point field theory for describing the geometric packing of gravelly cobble de

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24

ZHANG Shuchen and WAN Duanduan. "Effects of Allowing Temporary Overlaps During Compression on the Packing Density and Configuration of Hard Particle Systems." Acta Physica Sinica 74, no. 16 (2025): 0. https://doi.org/10.7498/aps.74.20250552.

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The dense packing of hard particles in confined spaces is of broad interest in both mathematics and statistical physics. It relates to classical packing problems under geometric constraints, plays a central role in understanding the self-assembly of microscopic particles such as colloids and nanoparticles, and inspires studies across a wide range of physical systems. However, achieving high packing densities under confinement remains challenging due to anisotropic particle shapes, the discontinuous nature of hard-core interactions, and geometric frustration. In this work, we develop a Monte Ca

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25

Huang, Qiu An, Geng Guang Xu, and Jian Yu Chen. "Research of the Particle Gradation Technology of Components in PBX Explosive Based on CPM Model." Applied Mechanics and Materials 727-728 (January 2015): 366–69. http://dx.doi.org/10.4028/www.scientific.net/amm.727-728.366.

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Basedon the assumption of related parameters in compressible packing model, thecompressible packing model was used for the calculation of the explosivespacking efficiency. The accuracy of the calculation was verified by experimentsand the relative error was 2.49%. Besides, the influence of content offineparticles and particle size distribution in explosives on stacking efficiencywas discussed. The results show that the stacking efficiency was increasingwith the particle size distribution increasing from 0~300μm to 0~700μm. Thepacking efficiency reached it’s maximum value when we only increased

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26

Pykhtin, A. A., I. D. Simonov-Emelyanov, A. N. Kovaleva, and K. S. Tsvetkova. "Characteristics of shungite particles of different fractional composition and design of compositions of particulate-filled polymer composite materials with different types of structures." Plasticheskie massy, no. 4 (September 1, 2024): 31–37. http://dx.doi.org/10.35164/0554-2901-2024-04-31-37.

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The paper presents the results of studies of technological properties (bulk and true density, particle size of the general fraction, particle size distribution, packing coefficient and maximum packing degree of filler particles, etc.) of shungite particles of different batches produced by LLC Nadvoitsky TDM Plant LLC (Karelia, RF).For the first time for shungite particles of different sizes the values of packing density (kуп) and maximum content of dispersed phase (φm) in DFPCM were determined, which allows to calculate generalized and reduced structure parameters, to carry out classification

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27

Teich, Erin G., Greg van Anders, Daphne Klotsa, Julia Dshemuchadse, and Sharon C. Glotzer. "Clusters of polyhedra in spherical confinement." Proceedings of the National Academy of Sciences 113, no. 6 (2016): E669—E678. http://dx.doi.org/10.1073/pnas.1524875113.

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Dense particle packing in a confining volume remains a rich, largely unexplored problem, despite applications in blood clotting, plasmonics, industrial packaging and transport, colloidal molecule design, and information storage. Here, we report densest found clusters of the Platonic solids in spherical confinement, for up to N=60 constituent polyhedral particles. We examine the interplay between anisotropic particle shape and isotropic 3D confinement. Densest clusters exhibit a wide variety of symmetry point groups and form in up to three layers at higher N. For many N values, icosahedra and d

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28

Cárdenas-Barrantes, Manuel, David Cantor, Jonathan Barés, Mathieu Renouf, and Emilien Azéma. "A micro-mechanical compaction model for granular mix of soft and rigid particles." EPJ Web of Conferences 249 (2021): 02008. http://dx.doi.org/10.1051/epjconf/202124902008.

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We use bi-dimensional non-smooth contact dynamics simulations to analyze the isotropic compaction of mixtures composed of rigid and deformable incompressible particles. Deformable particles are modeled using the finite-element method and following a hyper-elastic neo-Hookean constitutive law. The evolution of the packing fraction, bulk modulus and particle connectivity, beyond the jamming point, are characterized as a function of the applied stresses for different proportion of rigid/soft particles and two values of friction coefficient. Based on the granular stress tensor, a micro-mechanical

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29

Cao, De Wen, Jia Huan Wang, Yu Qing Sun, Ke Hua Chen, Cheng Ming Yu, and Ping Ju Li. "The Effect of the Microstructure of Semisolid Al Alloy on its Rheology." Applied Mechanics and Materials 490-491 (January 2014): 109–12. http://dx.doi.org/10.4028/www.scientific.net/amm.490-491.109.

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In the present work, the effect of the microstructure of AlSi6Mg2 alloy on its macro-rheological behavior of the steady AlSi6Mg2 alloy is investigated. Specifically, the effect of particle size, packing mode and degree of the agglomeration of particles are analyzed. It can be seen that the apparent viscosity decreases with increasing the particle size (d) ifdis between a few μm and 200 μm, while the solid particle size does not affect viscosity except this region. This theoretical prediction is in qualitatively agreement with the experimental data. The trend of the variation of the average agg

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30

Trulsson, Martin. "Rheology and shear jamming of frictional ellipses." Journal of Fluid Mechanics 849 (June 26, 2018): 718–40. http://dx.doi.org/10.1017/jfm.2018.420.

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Understanding and predicting dense granular flows is of importance in geology and industrial applications. Still, most theoretical work has been limited to flows and packings composed of discs or spheres, a narrow subset of all possible packings. To advance our understanding of more realistic flows we here study the granular rheology of ellipses in steady-state flow with a focus on the effects of elongation and interparticle friction. We carry out novel numerical simulations of amorphous granular flows in a shear cell under confining pressure, at constant shear rate and at various aspect ratio

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Hou, Jinghui, Yifei Ma, Zihan Zhang, Xuanhe Yang, Muhua Huang, and Chunpeng Chai. "The Relationship between Solid Content and Particle Size Ratio of Waterborne Polyurethane." Coatings 9, no. 6 (2019): 401. http://dx.doi.org/10.3390/coatings9060401.

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A series of high solid content carboxylic acid/sulfonic acid waterborne polyurethanes was prepared by the emulsion dispersion method. The particle size and solid content were measured. By changing the particle size of the large particles to achieve different particle size ratios, high solid content waterborne polyurethanes were obtained at specific particle size ratios. When the particle size ratio was >7, 4–5 or 2–3, the aqueous polyurethane could reach a higher solid content (more than 56%). This indicated that solid content is related to particle size distribution in high solid content w

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He, Li Qun, Ping Wu, Zi Da Li, and Li Li Feng. "Dynamics for Dense Packing of Colloids." Advanced Materials Research 465 (February 2012): 248–54. http://dx.doi.org/10.4028/www.scientific.net/amr.465.248.

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Colloidal packing by evaporation is a process that particles are packed by Stokes’ forces. As particles are far from each other, interactions among them are too weak to be taken into account and it’s the Stokes’ force on free particles that is in charge of packing. However, when they are close to some extent, the force is countered by particle interactions. Here, with the aid of force balance model, we demonstrate that the further packing is achieved by all drag forces of particles in the upstream.

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Katagiri, Jun, Sukeharu Nomoto, Masahiro Kusano, and Makoto Watanabe. "Particle Size Effect on Powder Packing Properties and Molten Pool Dimensions in Laser Powder Bed Fusion Simulation." Journal of Manufacturing and Materials Processing 8, no. 2 (2024): 71. http://dx.doi.org/10.3390/jmmp8020071.

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Various defects are produced during the laser powder bed fusion (L-PBF) process, which can affect the quality of the fabricated part. Previous studies have revealed that the defects formed are correlated with molten pool dimensions. Powder particles are thinly spread on a substrate during the L-PBF process; hence, powder packing properties should influence the molten pool dimensions. This study evaluated the influence of particle size on powder packing properties and molten pool dimensions obtained through numerical simulations. Using particles with different average diameters (Dav) of 24, 28,

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Sariyev, Bakytzhan, Abilkhairkhan Aldabergen, Dulat Akzhigitov, Boris Golman, and Christos Spitas. "Fabrication of Highly Compacted Green Body Using Multi-Sized Al Powder under a Centrifugal Force." Journal of Manufacturing and Materials Processing 6, no. 4 (2022): 79. http://dx.doi.org/10.3390/jmmp6040079.

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This study investigates the application of centrifugal force for the compaction of metal powder. Previous studies using the centrifugal force for manufacturing the green bodies were focused on fine powders with narrow particle size distribution or binary mixtures. This study explores the particle packing of multi-sized powder. Aluminum alloy powder with a particle size less than 100 µm and polymer binder were admixed and compacted in the centrifugal casting with ranging magnitudes of centripetal acceleration. Three different centrifugal forces were tested: 700, 1800, and 3700 G. The microstruc

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35

Zhao, Yuanbo, Mengyao Weng, Wenchao Wang, Wenzhe Wang, Hui Qi, and Chongming Li. "Fixed Particle Size Ratio Pure Copper Metal Powder Molding Fine Simulation Analysis." Crystals 15, no. 7 (2025): 628. https://doi.org/10.3390/cryst15070628.

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In this paper, a discrete element method (DEM) coupled with a finite element method (FEM) was used to elucidate the impact of packing structures and size ratios on the cold die compaction behavior of pure copper powders. HCP structure, SC structure, and three random packing structures with different particle size ratios (1:2, 1:3, and 1:4) were generated by the DEM, and then simulated by the FEM to analyze the average relative density, von Mises stress, and force chain structures of the compact. The results show that for HCP and SC structures with a regular stacking structure, the average rela

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36

Cao, Zhe, and Ming Li. "INCLUSION OF CONTACT FRICTION FOR PARTICLE-BASED SIMULATION OF SEDIMENT TRANSPORT OVER MOBILE BED." Coastal Engineering Proceedings, no. 37 (September 1, 2023): 34. http://dx.doi.org/10.9753/icce.v37.sediment.34.

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Abstract (sommario):

The particle based approach, including the particle resolving method, such as CFD-DEM, e.g. Drake and Calantoni (2001), Schmeeckle (2014), and the Particle-In-Cell (PIC) method, e.g. Patankar and Joseph (2001); Finn, M. Li, and Apte (2016); Y. Li et al. (2014), has become important tool for simulation of sediment transport in recent years. The latter is advantageous in the required computing resources when large amount of particles are involved and hence is more suitable for simulation of sediment transport over mobile bed. However, unlike that in CFD-DEM, special treatment is needed in the PI

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37

Shabaev, Sergey, Sergey Ivanov, and Martel Nikita. "The Development of Theoretical Basis of Mathematical Model of Crushed Rock Particle-Particle Packing." E3S Web of Conferences 105 (2019): 01028. http://dx.doi.org/10.1051/e3sconf/201910501028.

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Abstract (sommario):

The existing mathematical models that predict the poly-fractional granular media packing density do not take into account their packing degree, which gives a fairly large deviation of the simulation results from the actual experimental values (up to 20-25%). To increase the reliability of prediction of the elastic modulus of crushed rocks, it is necessary to develop the mathematical model that would give more adequate values, since it is known that a change in the granular medium packing density by only 5-10% can lead to a change in the elastic modulus up to 1.5-2 times. The conditions under w

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38

Alam, Parvez, and Martti Toivakka. "Fracture and Plasticity in Nano-Porous Particle-Polymer Composites." Key Engineering Materials 462-463 (January 2011): 24–29. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.24.

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A fracture mechanics algorithm, used for continuum mechanics simulations of nano-porous particle-polymer composites, is described herein. The model comprises close to a thousand ceramic particles bound together by latex polymer. These packings are generated using probabilistic methods (Monte Carlo). Pore-space arises as a function of particle shape and position coupled to the concentration and distribution of latex. Since the bridges are the weakest links in the solid state continuum, an understanding of failure behaviour is paramount for the design and optimisation of these composites. The ob

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39

Xu, Zhiwei, Michael Yu Wang, and Tianning Chen. "An Experimental Study of Particle Damping for Beams and Plates." Journal of Vibration and Acoustics 126, no. 1 (2004): 141–48. http://dx.doi.org/10.1115/1.1640354.

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Abstract (sommario):

This paper describes an experimental investigation of a particle damping method for a beam and a plate. Tungsten carbide particles are embedded within longitudinal (and latitudinal) holes drilled in the structure, as a simple and passive means for vibration suppression. Unlike in traditional damping materials, mechanisms of energy dissipation of particle damping are highly nonlinear and primarily related to friction and impact phenomena. Experiments are conducted with a number of arrangements of the packed particles including different particle sizes and volumetric packing ratios. The results

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40

HERMANN, A., E. A. LANGARO, S. H. LOPES DA SILVA, and N. S. KLEIN. "Particle packing of cement and silica fume in pastes using an analytical model." Revista IBRACON de Estruturas e Materiais 9, no. 1 (2016): 48–65. http://dx.doi.org/10.1590/s1983-41952016000100004.

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Abstract (sommario):

When added to concrete in appropriate content, silica fume may provide an increase in the mechanical strength of the material due to its high pozzolanic reactivity. In addition to the chemical contribution, physical changes can also be observed in concretes with silica fume due to an improvement in the particle packing of the paste. This is a result of their small size spherical particles, which fill the voids between the larger cement grains. However, it is necessary to properly establish the cement replacement content by silica fume, because at high amounts, which exceed the volume of voids

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41

KIRSH, V. A., and A. A. KIRSH. "COLLECTION OF SUBMICRON AEROSOL PARTICLES BY FILTERS COMPOSED OF NANOFIBERS." Коллоидный журнал 85, no. 1 (2023): 38–46. http://dx.doi.org/10.31857/s0023291222600316.

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Abstract (sommario):

The deposition of aerosol particles from a Stokes flow in filters composed of nanofibers has been considered at Knudsen numbers Kn ∼ 1. The efficiency of particle collection by model filters with 2D and 3D structures has been determined by numerical simulation as depending on particle radius rp , filter parameters (nanofiber radius a, packing density α and filter thickness), and filtration conditions taking into account the gas slip at the fibers.It has been shown that the efficiencies of particle collection by nanofibers in model 2D and 3D filters are almost equal at the same low packing dens

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42

Lebovka, N. I., M. R. Petryk, and N. V. Vygornitskii. "Percolation connectivity in deposits obtained usingcompetitive random sequential adsorption of binarydisk mixtures." Condensed Matter Physics 27, no. 1 (2024): 13201. http://dx.doi.org/10.5488/cmp.27.13201.

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Abstract (sommario):

Connectedness percolation phenomena in the two-dimensional (2D) packing of binary mixtures of disks with different diameters were studied numerically. The packings were produced using random sequential adsorption (RSA) model with simultaneous deposition of disks. The ratio of the particle diameters was varied within the range D=1-10, and the selection probability of the small disks was varied within the range 0-1. A core-shell structure of the particles was assumed for the analysis of connectivity. The packing coverages in a jamming state for different components, connectivities through small,

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43

Lam, David C. C. "Packing model for bimodal particle packing with aligned fibers." Journal of Materials Processing Technology 79, no. 1-3 (1998): 170–76. http://dx.doi.org/10.1016/s0924-0136(98)00007-7.

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44

Luo, Lisha, Zhifu Shen, Xudong Wang, and Hongmei Gao. "Evolution of rattling particles in deviatoric shear deformation of granular material." EPJ Web of Conferences 249 (2021): 11017. http://dx.doi.org/10.1051/epjconf/202124911017.

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Abstract (sommario):

Granular material such as clean sand in geotechnical engineering is characterized by structured internal deformation pattern and some interesting particle arrangement patterns. This study focuses on the evolution of the fraction of rattling particles in deviator deformation until the critical state. Numerical simulations using the discrete element method reveal the presence of rattling particles (with zero or only one contact with neighbouring particles) even in a very dense packing system. The results show that the initial fraction of rattling particles depends on sample density and particle

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45

Thiede, Tobias, Tatiana Mishurova, Sergei Evsevleev, Itziar Serrano-Munoz, Christian Gollwitzer, and Giovanni Bruno. "3D Shape Analysis of Powder for Laser Beam Melting by Synchrotron X-ray CT." Quantum Beam Science 3, no. 1 (2019): 3. http://dx.doi.org/10.3390/qubs3010003.

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Abstract (sommario):

The quality of components made by laser beam melting (LBM) additive manufacturing is naturally influenced by the quality of the powder bed. A packing density <1 and porosity inside the powder particles lead to intrinsic voids in the powder bed. Since the packing density is determined by the particle size and shape distribution, the determination of these properties is of significant interest to assess the printing process. In this work, the size and shape distribution, the amount of the particle’s intrinsic porosity, as well as the packing density of micrometric powder used for LBM, have be

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46

Duriagina, Z. A., I. A. Lemishka, V. V. Kulyk, and H. A. Hrydova. "Determination of properties of non-spherical VT20 alloy powders for modelling packing density." Metaloznavstvo ta obrobka metalìv 96, no. 4 (2020): 56–63. http://dx.doi.org/10.15407/mom2020.04.056.

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Abstract (sommario):

The study of unfavorable titanium alloy powders of VT20 grades was carried out and the methods of computer analysis were applied to determine the parameters of their optimal packaging. Metallographic studies were performed on a scanning electron microscope EVO-40XVP, and elemental analysis was performed using an energy dispersion spectrometer OXFORD INCA Energy 350. Determination of particle size distribution of powders was performed using image analysis software ImageJ. The surface morphology of non-spherical particles of VT20 alloy powder was studied for three different fractions: 100 ... 16

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47

Specht, Eckard. "A precise algorithm to detect voids in polydisperse circle packings." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2182 (2015): 20150421. http://dx.doi.org/10.1098/rspa.2015.0421.

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Abstract (sommario):

Computer simulations are the primary tool for studying polydisperse particle packings quanti- tatively. For the problem of packing N unequal circles in a larger container circle, nothing is known a priori about the optimal packing (i.e. the packing with the highest packing fraction). Simulations usually start from a random initial configuration with the aim to finish with a dense final packing. Unfortunately, smaller circles often get stuck in trapped positions and prevent the rest of the packing from growing larger. Hence, the knowledge of the structure of unoccupied areas or holes inside a p

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48

Assarsson, A., I. Nasir, M. Lundqvist, and C. Cabaleiro-Lago. "Kinetic and thermodynamic study of the interactions between human carbonic anhydrase variants and polystyrene nanoparticles of different size." RSC Advances 6, no. 42 (2016): 35868–74. http://dx.doi.org/10.1039/c6ra06175c.

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49

Liu, Xiang, and Rui Jie Yu. "Blast Furnace Slag Foundation Packing Grading and Compaction Characteristics Analysis." Applied Mechanics and Materials 368-370 (August 2013): 855–59. http://dx.doi.org/10.4028/www.scientific.net/amm.368-370.855.

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Abstract (sommario):

Through the packing particles analysis test and heavy compaction test at different depths of new system of Baotou steel finished product of the test section , analysis of the grain size distribution of slag and fly ash mixture and the content of coarse and fine particles on compaction effect are conducted , the results show that the filler embankment foundation is mainly for uniform gradation and continuous filler, when the coarse particle of the filler is 83% ～ 84% content, the compaction effect is best. Using multiple linear regression, the grain size distribution characteristics of the fill

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50

Cersonsky, Rose K., Greg van Anders, Paul M. Dodd, and Sharon C. Glotzer. "Relevance of packing to colloidal self-assembly." Proceedings of the National Academy of Sciences 115, no. 7 (2018): 1439–44. http://dx.doi.org/10.1073/pnas.1720139115.

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Abstract (sommario):

Since the 1920s, packing arguments have been used to rationalize crystal structures in systems ranging from atomic mixtures to colloidal crystals. Packing arguments have recently been applied to complex nanoparticle structures, where they often, but not always, work. We examine when, if ever, packing is a causal mechanism in hard particle approximations of colloidal crystals. We investigate three crystal structures composed of their ideal packing shapes. We show that, contrary to expectations, the ordering mechanism cannot be packing, even when the thermodynamically self-assembled structure is

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