Impact breakage of spherical, cuboidal and cylindrical agglomerates

Liu, L.; Kafui, K.D.; Thornton, Colin

doi:10.1016/j.powtec.2010.01.007

Cited by 93 publications

(51 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In contrast, the fragmentation of particles under controlled conditions is used in comminution processes such as the milling of vegetal products or grinding of mineral materials. The evolution of particle size distribution and energy dissipation in such processes depend on many factors such as particle properties (shape, crushability), initial size distribution, loading history, and mobility of the grains during the crushing process [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulations by the molecular dynamics (MD) method or discrete element method (DEM) have been increasingly employed in order to get a better understanding of the particle-scale mechanisms of the comminution process [1,9,[27][28][29][30][31]. Such methods combine the general framework of the DEM, based on rigid-body dynamics and frictional contact interactions, with a particle fracture model.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bonded-cell model for particle fracture

et al. 2015

View full text Add to dashboard Cite

Particle degradation and fracture play an important role in natural granular flows and in many applications of granular materials. We analyze the fracture properties of two-dimensional disklike particles modeled as aggregates of rigid cells bonded along their sides by a cohesive Mohr-Coulomb law and simulated by the contact dynamics method. We show that the compressive strength scales with tensile strength between cells but depends also on the friction coefficient and a parameter describing cell shape distribution. The statistical scatter of compressive strength is well described by the Weibull distribution function with a shape parameter varying from 6 to 10 depending on cell shape distribution. We show that this distribution may be understood in terms of percolating critical intercellular contacts. We propose a random-walk model of critical contacts that leads to particle size dependence of the compressive strength in good agreement with our simulation data.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bonded-cell model for particle fracture

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Previous studies on similar pellets pointed out that localised cracks are formed but that fragmentation generally does not occur [12][13][14]. Other studies have focussed on employing the Discrete Element Method (DEM) to better understand agglomerate breakage [15][16][17]. The modelled agglomerates are composed of spherical particles bound together, whereas the pellets of this investigation have a mesh like microstructure, as mentioned above.…”

Section: Introductionmentioning

confidence: 92%

Effect of spherical-agglomerate strength on the distribution of force during uniaxial compression

2011

View full text Add to dashboard Cite

PostprintThis is the accepted version of a paper published in Powder Technology. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Mahmoodi, F., Alderborn, G., Frenning, G. (2011) Effect of spherical-agglomerate strength on the distribution of force during uniaxial compression. We employ the carbon paper technique with the aim of investigating the effect of spherical-agglomerate (pellet) strength on force distributions, through confined compression of approximately 1 mm sized pellets formed from microcrystalline cellulose and polyethylene glycol. The carbon paper technique relies on the transference of imprints from compressed pellets onto white photo quality paper, which are digitised and processed via image processing software. The investigated pellets can both deform plastically and develop localised cracks in response to an applied stress, while remaining largely intact during confined compression. Our results indicate that such crack formation -henceforth referred to as fracture -has a decisive influence on force distributions.Previous work on non-fracturing systems has found that the distribution of normalised forces tends to narrow with increasing particle deformation. No narrowing is observed after the point of fracture in this study and the width of the distributions -as quantified by the standard deviation of non-normalised forces -is found to increase with the difference between non-normalised mean force and fracture force. Additional corroborative results show that spatial force-force correlations typically exhibit a marked change once the fracture force is exceeded.

show abstract

“…These approaches used differing models and were applied to specific problem areas with varying degree of success [31,32]. To date, DEM simulations have been extensively applied to diverse problems in granular processes such as packing of particles [33,34], flow from a hopper [35,36], die filling [37], fragmentation of agglomerates [38], bulk compression [39][40][41], flow in a screw conveyor [42] and powder mixing [43,44].…”

Section: Introductionmentioning

confidence: 99%

Discrete Particle Method for Simulating Hypervelocity Impact Phenomena

Watson

Steinhauser

2016

Preprint

View full text Add to dashboard Cite

Abstract:In this paper, we introduce a computational model for the simulation of hypervelocity impact (HVI) phenomena which is based on the Discrete Element Method (DEM). Our paper constitutes the first application of DEM to the modeling and simulating of impact events for velocities beyond 5 kms −1 . We present here the results of a systematic numerical study on HVI of solids. For modeling the solids, we use discrete spherical particles that interact with each other via potentials. In our numerical investigations we are particularly interested in the dynamics of material fragmentation upon impact. We model a typical HVI experiment configuration where a sphere strikes a thin plate and investigate the properties of the resulting debris cloud. We provide a quantitative computational analysis of the resulting debris cloud caused by impact and a comprehensive parameter study by varying key parameters of our model. We compare our findings from the simulations with recent HVI experiments performed at our institute. Our findings are that the DEM method leads to very stable, energy-conserving simulations of HVI scenarios that map the experimental setup where a sphere strikes a thin plate at hypervelocity speed. Our chosen interaction model works particularly well in the velocity range where the local stresses caused by impact shock waves markedly exceed the ultimate material strength.

show abstract

Impact breakage of spherical, cuboidal and cylindrical agglomerates

Cited by 93 publications

References 23 publications

Bonded-cell model for particle fracture

Bonded-cell model for particle fracture

Effect of spherical-agglomerate strength on the distribution of force during uniaxial compression

Discrete Particle Method for Simulating Hypervelocity Impact Phenomena

Contact Info

Product

Resources

About