Micromechanical Simulation and Analysis of One-Dimensional Vibratory Sphere Packing

An, Xizhong; Yang, Runyu; Dong, Kejun; Zou, Ruiping; Yu, Aibing

doi:10.1103/physrevlett.95.205502

Cited by 119 publications

(51 citation statements)

References 33 publications

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“…However, once the frequency is around 40 Hz, the number of particles with ordered structures increases sharply. Regarding to the previous study, ordered structure is not observed in a 1D vertically vibrated bed and ȡ is always not above 0.64 10 , which seems contradictory to the findings here. One difference between two studies is that the bottom is a mesh in this study, instead of flat plane in the previous study.…”

Section: Structure Of Final Statecontrasting

confidence: 56%

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Formation of ordered structure and its effect on particle percolation in a vibrated bed

Esfandiary

Dong

2013

AIP Conference Proceedings

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Abstract. Particle percolation in a vibrated bed is investigated by means of discrete element method (DEM). It is found that under some vibrational conditions, percolation becomes unsteady with the percolation velocity fluctuating in a wide range. This happens when dimensionless vibrational velocity, V b (A.(2ʌf)/ඥ݃‫,)ܦ‬ is in a certain range, where A is the vibrational amplitude, f is the vibrational frequency, g is the gravitational acceleration and D is the diameter of large particles. The unsteady particle percolation in this range has been analysed on a particle scale, which reveals that V b (in the certain range) can favour the crystallization in the vibrated bed, which significantly decreases the particle percolation velocity. Such crystallizations occasionally happen, leading to the unsteady percolation behaviour.

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Section: Structure Of Final Statecontrasting

confidence: 56%

“…Any further increase in ȡ requires external energy to overcome the interparticle locking or jamming. One dimensional (1D) vibration can increase ȡ to 0.64 10 . Usually, packing of ȡ=0.64 is regarded as the maximally random jammed state (MRJ), which suggests that if ȡ is above 0.64, ordered structures will be formed in the packing 11 .…”

Section: Introductionmentioning

confidence: 99%

Formation of ordered structure and its effect on particle percolation in a vibrated bed

Esfandiary

Dong

2013

AIP Conference Proceedings

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“…Since then, there has been continual interest in the subject. Recent investigations (of which we list only a few) on density relaxation have involved computational approaches, theoretical models and physical experiments [1][2][3]9,10,16,18,24,25,29,30,34]. We remark that the study of waves in continuously vibrated granular systems has also been a topic of interest, as in [32] or the experiments of Eshuis et al [11] who developed a phase diagram delineating five physical regimes in a layer.…”

Section: Introductionmentioning

confidence: 95%

Evolution of solids fraction surfaces in tapping: simulation and dynamical systems analysis

et al. 2012

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We report our findings on the evolution of solids fraction in a tapped system of inelastic, frictional spheres as a function of the applied acceleration obtained via discrete element simulations. Animations of the simulation data reveal the propagation of a wave initiated from the base that causes local rearrangements of the particles ultimately leading to the development of a dense microstructure. We also describe the analysis of dynamical models capable of predicting the simulated behavior, and advanced visualization techniques for revealing the dynamics. Mathematics Subject Classification 35C07 · 35Q51 · 37N15Electronic supplementary material The online version of this article (

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“…Here, we use DEM to generate initial packing structure before compaction and use MPFEM for compaction. DEM [23][24][25][26] and MPFEM [18,27] simulation methods in corresponding processes have been successfully utilized in our previous work, therefore, the details of these methods will not be illustrated here. Readers who are interested please refer to our recently published papers.…”

Section: Simulation Methodsmentioning

confidence: 99%

Double-action Die Compaction of Fe-Al Composite Powder- A Study by MPFEM Simulation

Li¹,

An²

2017

Proceedings of the 3rd Annual International Conference on Advanced Material Engineering (AME 2017)

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Abstract.To identify the densification process and corresponding mechanism, double-action die compaction of Fe-Al composite powder (with 20 wt.% Al) was modeled by multi-particle finite element method (MPFEM) from particulate scale in 2D. The initial packing structure generated by discrete element method (DEM) was input into FEM model where the mesh division of each particle was discretized. During compaction, macro and micro properties of the compacts were characterized and compared with those from single-action die compaction. The results show that with the same initial packing structure, double-action compaction can create dense compact with more uniform stress and relative density distributions at relatively low pressure. Densification mechanism analyses indicate that double-action compaction can more effectively improve the particle rearrangement to realize the dense packing structure compared with single action compaction when the pressure is low, in the former case large voids or pores have almost been eliminated, which is the precondition for the formation of high quality compact. With the increase of the pressure, further rearrangement and elastic and plastic deformation of Fe and Al particles can be observed; in this stage, the densification is mainly due to the plastic deformation of Al particles to fill their adjacent interstices. At high pressure, the compact shows bulk behavior, and some isolated enclosed pores are remained in the final compact. MPFEM simulation demonstrates that the final compact obtained in double-action compaction shows lower stresses/contact forces, and the stress distribution and particle deformation are more uniform. IntroductionIn recent years, Fe-Al intermetallic compounds are attractive due to their unique properties such as low cost, low density, ease of fabrication, good high temperature mechanical property, excellent resistance to oxidation and corrosion, high electrical resistivity, as well as dual characteristics of both structural and functional materials etc [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. These properties have led to the identification of many potential uses, including high temperature structural materials, sintered porous gas-metal filters, heating elements, furnace fixtures, heat-exchanger piping, automobile and other industrial valve components, catalytic converter substrates, and components for molten salt applications [3][4][5]9,19,20]. Therefore, in the past decades much effort was paid in the production of Fe-Al intermetallics, where the commonly used methods are melting/casting, mechanical alloying, combustion synthesis with thermo-mechanical treatment, and powder metallurgy (PM) etc [9,14,21], among which PM processing has increasingly attracted researchers' eyes due to its unique advantages in structure and size control, property improvement, and net shape or near net shape forming [14]. However, most studies in previous work using PM method for the preparation of Fe-Al intermetallics were mainly carried out in physical ex...

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Micromechanical Simulation and Analysis of One-Dimensional Vibratory Sphere Packing

Cited by 119 publications

References 33 publications

Formation of ordered structure and its effect on particle percolation in a vibrated bed

Formation of ordered structure and its effect on particle percolation in a vibrated bed

Evolution of solids fraction surfaces in tapping: simulation and dynamical systems analysis

Double-action Die Compaction of Fe-Al Composite Powder- A Study by MPFEM Simulation

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