On the local contact behaviour in regular lattices of composite powders

Skrinjar, Olle; Larsson, Per-Lennart

doi:10.1016/j.jmatprotec.2006.11.099

Cited by 12 publications

(5 citation statements)

References 21 publications

(48 reference statements)

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“…In other words there is interaction between neighboring contacts. Skrinjar and Larrson (2007) performed 3D finite element simulations of the compaction of the body centered cubic array (BCC) and reported that the normal force deviates from the force developed at a contact formed between two spheres at moderate contact deformations. The deviation from the response of two particles in contact was attributed to the formation of additional contacts in the BCC configuration at the later stages of compaction.…”

Section: Introductionmentioning

confidence: 99%

On the force–displacement law of contacts between spheres pressed to high relative densities

Tsigginos

Strong

Zavaliangos

2015

International Journal of Solids and Structures

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a b s t r a c tA finite element study of the interparticle force-displacement laws on contacts of spheres at conditions corresponding to compacts pressed to high relative densities is presented here. Under these conditions, the response of a contact can be affected by the presence of neighboring contacts. Finite element simulations of axisymmetric models of equispaced and equally loaded contacts show that the forcedisplacement law is not unique and depends on the number of neighboring contacts. The force at a given interparticle deformation is minimum for Z = 2 but at higher coordination numbers becomes larger after a critical deformation due to the interaction of the stress fields of neighboring contacts. This difference is magnified when the local porosity closes. Furthermore, numerical simulations of periodic arrays of spheres were conducted to assess the effect of loading path and the formation of new contacts on the response of existing contacts. In both cases, it was found that, the contact response depends on the overall triaxiality of the deformation of the particle. A new deformation fabric tensor is proposed based on the deformation and direction of all contacts on a particle. The first and second invariants of this tensor are used to characterize the triaxiality of the deformation on a particle. These results form the basis for more appropriate force-displacement laws at contacts that can be implemented in discrete element simulations for high density problems.

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Section: Introductionmentioning

confidence: 99%

On the force–displacement law of contacts between spheres pressed to high relative densities

Tsigginos

Strong

Zavaliangos

2015

International Journal of Solids and Structures

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“…The FEM may be used for investigating local contact behaviours of powders during compaction when used in a combination with a micromechanical model [11]. The combined finite/discrete element (FE/DE) method gives a more thorough description of the particles during compression but is unfortunately also very time consuming.…”

Section: Introductionmentioning

confidence: 99%

An experimental evaluation of the accuracy to simulate granule bed compression using the discrete element method

Persson

Frenning

2012

Powder Technology

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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):Persson, A., Frenning, G. (2012) An experimental evaluation of the accuracy to simulate granule bed compression using the discrete element method. AbstractIn this work, granule compression is studied both experimentally and numerically with the overall objective of investigating the ability of the discrete element method (DEM) to accurately simulate confined granule bed compression. In the experiments, granules of microcrystalline cellulose (MCC) in the size range 200-710 µm were used as model material. Unconfined uniaxial compression of single granules was performed to determine granule properties such as the yield pressure and elastic modulus and compression profiles of the MCC granules were obtained from granule bed compression experiments. By utilizing the truncated Hertzian contact model for elastic-perfectly plastic materials, the rearrangement and plastic deformation stages of the force displacement curve were found to be in reasonable agreement with experiments. In an attempt to account for the final compression stage, elastic deformation of the compact, a simple modification of the contact model was proposed. This modification amounted to the introduction of a maximal plastic overlap, beyond which elastic deformation was the only deformation mode possible. Our results suggest that the proposed model provides an improved, although not perfect, 2 description of granule bed compression at high relative densities and hence may be used as a basis for future improvements.

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“…In a recent study Skrinjar et al [8] also derived approximate but accurate relations describing contact between dissimilar particles in a fairly general situation. The accuracy of these relations in a compaction situation have been investigated by large scale finite element simulations of compaction of particles forming regular lattices, for example, in the work of Mesarovic and Fleck [9], Riera and Prado [10] and Skrinjar and Larsson [11], and found to be sufficient at initial and intermediate contact.…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Particle Size Distribution in Cold Powder Compaction

Olsson

Larsson

2012

Journal of Applied Mechanics

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The effect of particle size distribution in powder compaction has been studied using the discrete element method. Both isostatic compaction and closed die compaction are studied together during the entire loading process. Particle rotation and frictional effects are accounted for in the analysis. The particles are, constitutively described by rigid plasticity, assumed to be spherical with the size of the radii that follows a truncated normal distribution. The results show that size distribution effects are small on global compaction properties like compaction pressure if the size distribution is small. Furthermore, the size distribution had no influence at all on the macroscopic behavior at unloading. To verify the model, comparisons were made on two different sets of experiment found in the literature where the particles were of varying sizes. Good agreement was found both on fundamental properties like the average number of contacts per particle and on more important properties from a practical point of view, like the compaction pressure

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On the local contact behaviour in regular lattices of composite powders

Cited by 12 publications

References 21 publications

On the force–displacement law of contacts between spheres pressed to high relative densities

On the force–displacement law of contacts between spheres pressed to high relative densities

An experimental evaluation of the accuracy to simulate granule bed compression using the discrete element method

On the Effect of Particle Size Distribution in Cold Powder Compaction

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