Size Ratio Effects on Particle Contact Evolution at Uniaxial Powder Compaction

Skrinjar, Olle; Larsson, Per-Lennart

doi:10.1080/02726351.2011.587096

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…In that regards, numerical modelling based on the discrete element method (DEM) is a cost effective way as it allows the discrete nature of particles to be accounted for. The DEM studies on powder compaction have been carried out to characterize mechanical properties of single particle [7,8], inhomogeneity induced by particle-wall friction [9], the evolution of internal structure [10], the effects of particle shape and particle size [11,12]. Recently, DEM has been extended to simulate compaction of powders with relative density higher than 0.85 [13].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Die and Unconfined Compactions of Wet Particles

Evans

et al. 2015

Procedia Engineering

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A numerical method, based on the Discrete Element Method (DEM), is developed to simulate the closed-die compaction and unconfined compaction of wet granular materials. Elastic perfectly plastic are assumed for particles, local contacts are characterized by non-linear elastic and linear plastic deformation. The capillary force is explicitly considered. Solid bonds are introduced between contacting particles to account for the strength gain after closed-die compaction. The numerical model is described in detail. We also illustrate how the compact properties such as compressive strength and failure pattern are influenced by the bond strength and compaction pressure, which determine the mechanical and geometrical integrity of compact. The numerical results demonstrate a qualitative agreement with corresponding results from previous theoretical, experimental studies for the trend of stress-strain response and failure patterns under unconfined compaction. This study proves that solid bond model must be taken into account when modelling granular compaction process using DEM method.

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Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Die and Unconfined Compactions of Wet Particles

Evans

et al. 2015

Procedia Engineering

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“…For this purpose, the discrete element method (DEM) offers an efficient way to obtain micromechanical insight into its behaviour as it treats particles individually and explicitly considers the particle characteristics, material properties and the inter-particle forces. DEM has been adopted to investigate particle compaction, such as the effect of mechanical properties of particles [2,3], particle-wall friction induced inhomogeneity [4], evolution of compact structure [5] and the effects of moisture, particle shape and particle size [6][7][8]. Recently we conducted a DEM study of the compressive strength of iron ore compacts using a bonded particle model [16].…”

Section: Introductionmentioning

confidence: 99%

Discrete Modelling of Compaction of Non-spherical Particles

Evans

et al. 2017

EPJ Web Conf.

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Compaction behaviour and mechanical response of a compact show strong dependence on particle shape. In this study, a numerical model based on the discrete element method (DEM) was developed to study the compaction behaviour of spheroidal particles. In the model, particle shape was approximated by gluing multiple spheres together. A bonded particle model was adopted to describe interparticle bonding force. The DEM model was first validated by comparing the properties of packing of spheroids (packing density, coordination number) with literature data and then applied to both die compaction and unconfined compression. In die compaction, the effect of aspect ratio on the densification was mainly due to the difference in the initial packing. In unconfined compression, the increase in compressive strength with increasing aspect ratio was attributed to the increase in the number of interparticle bonding. The findings facilitate a better understanding of the relation of particle shape to the compaction behaviour and compact strength. 2 Model description and simulation conditions 2.1 DEM model

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“…For example, it has been combined with explicit dynamics to study the isostatic compression of powders [20], the dynamic compaction characteristics of granular ceramics [21], the packing densification of particles under compression [22] and the effect of particle size distribution on the uniaxial compressive behaviour of particles [23]. In addition to this, DEM simulations have also been used to study the influence of particle shape and inter-particle friction on the mechanical response of particles under uniaxial compression [24] as well as the particle contact evolution in the uniaxial compression of dissimilar powders [25].…”

Section: Introductionmentioning

confidence: 99%

A discrete element model to predict the pressure-density relationship of blocky and angular ceramic particles under uniaxial compression

2015

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In this study, we present a numerical model based on the discrete element method (DEM) that incorporates contact friction and rolling resistance to simulate the uniaxial, isostatic compaction of hard, blocky and angular ceramic powders. The model has been formulated using the open-source software, YADE. In this numerical model, packing followed by the compaction of up to 25,000 powder particles has been simulated and the HertzMindlin contact model has been used to simulate the rolling resistance and contact friction between the particles. The numerical model is discussed in detail and the pressure-density relationships developed by this model are compared with experimental data derived during the course of this study as well as data from two previous studies. Overall, the proposed simplistic DEM model is shown to produce good agreement with test results under considered loading conditions.

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Size Ratio Effects on Particle Contact Evolution at Uniaxial Powder Compaction

Cited by 10 publications

References 38 publications

Numerical Modelling of Die and Unconfined Compactions of Wet Particles

Numerical Modelling of Die and Unconfined Compactions of Wet Particles

Discrete Modelling of Compaction of Non-spherical Particles

A discrete element model to predict the pressure-density relationship of blocky and angular ceramic particles under uniaxial compression

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