DEM study of the mechanical strength of iron ore compacts

He, Yanzhang; Wang, Z.; Evans, Tim; Yu, Aibing; Yang, Runyu

doi:10.1016/j.minpro.2015.05.005

Cited by 30 publications

(11 citation statements)

References 48 publications

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“…The geometries relating to the matrix and upper punch were removed when the upper punch ended its upward movement, as mentioned above. This action was also conducted in other works [18,19].…”

Section: Dem Simulationsmentioning

confidence: 95%

“…Therefore, simulations using DEM have been used to analyze a great variety of processes, including the processes involving the sintering technique. The DEM simulations have been used to simulate the mill process [10,11], powder mixing [12,13], or powder packing [14][15][16][17][18][19][20][21][22][23][24]. Moreover, some approaches have been developed over the last years to simulate the behavior of the particles during the heat treatment in the sintering process [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the bonded-particle model was calibrated and the results of the simulations were compared with the results of experiments that other authors had carried out previously using different types of rocks. Other authors combined the effect of a bonded-particle model with other contact models to simulate the behavior of spherical [18,19] and nonspherical [20,21] particles under confined and unconfined compression. In all the cases, they used the combination of an elasto-plastic model with other contact model that introduces capillary forces to simulate the powder compaction.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling for Simulation of Compaction of Refractory Materials for Secondary Steelmaking

et al. 2020

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The purpose of this work is to simulate the powder compaction of refractory materials, using the discrete element method (DEM). The capability of two cohesive contact models, implemented in different DEM packages, to simulate the compaction of a mixture of two refractory materials (dead burnt magnesia (MgO) and calcined alumina (Al2O3)) was analyzed, and the simulation results were compared with experimental data. The maximum force applied by the punch and the porosity and final shape quality of the compact were examined. As a starting point, the influence of Young’s modulus (E), the cohesion energy density (CED), and the diameter of the Al2O3 particles (D) on the results was analyzed. This analysis allowed to distinguish that E and CED were the most influential factors. Therefore, a more extensive examination of these two factors was performed afterward, using a fixed value of D. The analysis of the combined effect of these factors made it possible to calibrate the DEM models, and consequently, after this calibration, the compacts had an adequate final shape quality and the maximum force applied in the simulations matched with the experimental one. However, the porosity of the simulated compacts was higher than that of the real ones. To reduce the porosity of the compacts, lower values of D were also modeled. Consequently, the relative deviation of the porosity was reduced from 40–50% to 20%, using a value of D equal to 0.15 mm.

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Section: Dem Simulationsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Modeling for Simulation of Compaction of Refractory Materials for Secondary Steelmaking

et al. 2020

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“…Table 1 lists the equations used for the calculation of these forces. The details can be found elsewhere (He et al, 2018a;He et al, 2015;He et al, 2018b).…”

Section: Model Developmentmentioning

confidence: 99%

Flow behaviour of an agitated tubular reactor using a novel dynamic mesh based CFD model

Bayly

Hassanpour

et al. 2020

Chemical Engineering Science

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Agitated tubular reactor (ATR) is an intensified, continuous, reactor design in which radial mixing is decoupled from axial flow. This study proposed a new CFD approach to study fluid dynamics and mixing mechanisms in the ATR. It combines a soft-sphere collision model with a dynamic meshing approach on ANSYS Fluent to tackle structure-structure and fluid-structure interactions (FSI) simultaneously. Its ability to handle FSI is validated on sedimentation of a large sphere in a quiescent fluid. A periodic motion of the agitator was predicted, which is mainly driven by contact with the external oscillating tube. The fluid motion is complex, with vortex structures forming behind the agitator at its highest point and the highest fluid velocities seen as fluid is squeezed under the agitator. Performance of Reynolds stress models were evaluated and pressure-strain term shows little effect on agitator's motion. The energy was found to be mainly consumed by viscous dissipation.

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“…For E b ≥ E, the DEM models provide typical brittle behaviour, characterised by a rapid decrease of the force-displacement response [27]. As the E b /E ratio decreases, the breakage mode evolves from brittle to semi-brittle, with a round force-displacement response [30][31][32].…”

Section: Materials With Intermediate Compacted Structures and An Intementioning

confidence: 99%

Discrete Element Method Modelling of the Diametral Compression of Starch Agglomerates

et al. 2020

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Starch agglomerates are widely applied in the pharmaceutical, agricultural, and food industries. The formation of potato starch tablets and their diametral compression were simulated numerically and verified in a laboratory experiment to analyse the microscopic mechanisms of the compaction and the origins of their breakage strength. Discrete element method (DEM) simulations were performed using EDEM software. Samples comprised of 120,000 spherical particles with radii normally distributed in the range of 5–36 μm were compacted in a cylindrical die with a diameter of 2.5 cm. The linear elastic–plastic constitutive contact model with a parallel bonded-particle model (BPM) was used to model the diametral compression. DEM simulations indicated that the BPM, together with the linear elastic–plastic contact model, could describe the brittle, semi-brittle, or ductile breakage mode, depending on the ratio of the strength to Young’s modulus of the bond and the bond-to-contact elasticity ratio. Experiments confirmed the findings of the DEM simulations and indicated that potato starch (PS) agglomerates can behave as a brittle, semi-brittle, or ductile material, depending on the applied binder. The PS agglomerates without any additives behaved as a semi-brittle material. The addition of 5% of ground sugar resulted in the brittle breakage mode. The addition of 5% gluten resulted in the ductile breakage mode.

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DEM study of the mechanical strength of iron ore compacts

Cited by 30 publications

References 48 publications

Numerical Modeling for Simulation of Compaction of Refractory Materials for Secondary Steelmaking

Numerical Modeling for Simulation of Compaction of Refractory Materials for Secondary Steelmaking

Flow behaviour of an agitated tubular reactor using a novel dynamic mesh based CFD model

Discrete Element Method Modelling of the Diametral Compression of Starch Agglomerates

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