Influence of grain shape and intergranular friction on material behavior in uniaxial compression: Experimental and DEM modeling

Wiącek, Joanna; Molenda, M.; Horabik, J.; Ooi, Jin Y.

doi:10.1016/j.powtec.2011.10.060

Cited by 88 publications

(41 citation statements)

References 26 publications

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“…Material properties include density, stiffness and surface roughness, while the geometric properties of particles include their size, size distribution and shape. Each of these parameters has been found to determine the structure and the mechanical response of granular materials to external shear and compressive loads [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Wiącek

Molenda

2018

Granular Matter

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The deformation of three-dimensional highly polydisperse packings of frictional spheres with continuous unimodal and discrete uniform particle size distributions (PSDs) under uniaxial compression was investigated, using the discrete element method. The stress transmission and elasticity parameters, i.e., the effective elastic modulus and the Poisson's ratio of the granular assemblies were examined; these parameters are important in many engineering disciplines. The influence of the shape of the PSD on the porosity and the transmission of pressures in samples was observed; however, the shape of the PSD did not affect the stiffness and the Poisson's ratio of polydisperse granular packings. The results revealed that, in some cases, knowledge of the grain size distribution is not a critical issue for modeling granular packings composed of non-uniformly sized spheres.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Wiącek

Molenda

2018

Granular Matter

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“…Wi cek et al [17] investigated the influence of grain shape and interparticle friction of peas and beans on the mechanical response of the assemblies in a uniaxial compression test. They showed that the mechanical response of the granules was highly affected by increasing the aspect ratio of the particles; the lateral-to-vertical pressure decreased as the particles aspect ratio was increased.…”

Section: Introductionmentioning

confidence: 99%

Effect of particle shape on flow in discrete element method simulation of a rotary batch seed coater

et al. 2016

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In the seed processing industry, rotary batch seed coaters are widely used for providing a protective coating layer (consisting of various ingredients including fertilisers and crop protection chemicals) on the seeds. Seed motion and mixing are important in ensuring uniform coating. In the batch seed coater, the base of a cylindrical vessel rotates, whilst the cylindrical wall is stationary and two baffles turn the bed over for mixing. In the present study, the Discrete Element Method (DEM) is used to simulate the effect of particle shape on motion and mixing in this device. Corn seed is used as a model material and the effect of its shape on motion is analysed by considering two approaches: (1) manipulation of rolling friction to account for shape as it is commonly used in the field; (2) approximation of the actual shape by a number of overlapping spheres of various sizes. The geometry of corn seeds is captured using X-Ray micro tomography and then the ASG2013 software (Cogency, South Africa) is used to generate and optimise the arrangement of the overlapping spheres. A comparison is made of the predicted tangential and radial velocity distributions of the particles from DEM and those measured experimentally. It is concluded that for rapid shearing systems with short collisional contacts a small number of clumped spheres suffices to provide a reasonable agreement with experimental results. Equally well, manipulating the rolling friction coefficient can provide results that match experiments but its most suitable value is unknown a priori, hence the approach is empirical rather than predictive. 2

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“…The behaviors of spheres and elongated particles have been extensively studied in numerical simulations. We have contributed to this area in our earlier work [8,9].…”

Section: Introductionmentioning

confidence: 99%

Pressure distribution in an assembly of wooden cylinders with various aspect ratios under uniaxial confined compression

et al. 2016

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Understanding how forces propagate in granular assemblages is important for equipment design and process control in many technologies. Yet, it remains poorly understood. In this study, a cuboidal assembly comprising cylinders of various lengths (aspect ratios AR ranging from 0.9 to 3.6) were subjected to uniaxial confined compression tests. Samples were vertically compressed until the top platen exerted a pressure of 50 kPa on the uppermost particles. This maximum pressure corresponds to the hydrostatic pressure of an approximately 15 m high column of chopped wood that may be encountered in real storage structures. The nonlinear loading curves were obtained depended on the aspect ratios of the cylinders. The modulus of elasticity, calculated from the linear elastic part of the stress-strain curve, monotonically decreased from 10.2 to 8.6 MPa as the aspect ratio increased from 1.2 to 3.6. The elastic modulus and volume fraction exhibited similar trends as functions of the aspect ratio. The horizontal-to-vertical pressure ratio was calculated as the horizontal pressure exerted on the wider walls to the vertical pressure exerted on the top lid during loading-unloading cycles. For ARs up to 3.6, the pressure ratio was approximately 0.31; for the longest cylinders (AR = 3.6), it decreased to approximately 0.27, probably because the assumption of the representative chamber volume was invalidated at this AR.

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Influence of grain shape and intergranular friction on material behavior in uniaxial compression: Experimental and DEM modeling

Cited by 88 publications

References 26 publications

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Numerical analysis of compression mechanics of highly polydisperse granular mixtures with different PSD-s

Effect of particle shape on flow in discrete element method simulation of a rotary batch seed coater

Pressure distribution in an assembly of wooden cylinders with various aspect ratios under uniaxial confined compression

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