A discrete element analysis for general failure behavior of basalt

Rabiei, Moeed; Samea, Parham; Shadi, Amin; Ghoreishi‐Madiseh, Seyed Ali

doi:10.1016/j.ijrmms.2023.105394

Cited by 8 publications

(2 citation statements)

References 38 publications

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“…The measurements were conducted with a step size of 0.01 • , covering a 2θ range of 10 to 70 • at 0.5 s per step. Results showed that this rock contained considerable proportions of Plagioclase (45.11%), Diopside (17.66%), Olivine (12.15%), Hypersthene (10.33%), and small amounts of Orthoclase (7.39%), Ilmenite (4.52%), Magnetite (1.86%), and Apatite (1.02%) (see also [33,34]). The block was cored and transferred to a laboratory-scale jaw crusher (Sturtevant 2 × 6 Style "F") feeder.…”

Section: Materials Propertiesmentioning

confidence: 97%

Energy Efficiency of Microwave-Induced Heating of Crushed Rocks/Ores

et al. 2023

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The interaction between electromagnetic waves and heat transfer phenomena due to microwave treatment is of utmost importance for an energy-efficient microwave-integrated grinding circuit. In this study, the effect of microwave irradiations on the heat absorptions of crushed particles is carried out by developing a numerical model. Crushed particles are simulated as diced-shaped geometries with different sitting arrangements but similar size distributions. The energy efficiency of the microwave treatment process is studied by introducing temperature-dependent dielectric properties and accounting for the convective heat loss from the particle boundaries to the surrounding environment. The simulations are quantitatively validated with the experimental results for heat over microwave efficiency. Heat absorption of larger particles is found to be significantly higher, and the arrangement of particles exerts a negligible effect on overall energy absorption. It is also found that ores with a larger average diameter can yield higher energy efficiencies, and the maximum absorption can be achieved by placing the particles at certain distances from the waveguide of the microwave.

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Section: Materials Propertiesmentioning

confidence: 97%

Energy Efficiency of Microwave-Induced Heating of Crushed Rocks/Ores

et al. 2023

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“…With the continuous advancement in computational capabilities, the discrete element method (DEM) has become increasingly crucial for elucidating the interaction mechanisms among pebble aggregates [18][19][20][21]. The essence of DEM lies in decomposing macroscopic subjects into numerous discrete particle units [22][23][24] and then leveraging Newton's laws to analyse their interrelations at a microscopic level [25,26]. This analytical approach enables accurate predictions of the dynamic and kinematic behaviour of the investigated entity under varied stress and strain conditions.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Varied Particle Sizes on the Load-Bearing Properties of Arrester Bed Aggregates

Liu,

Bai

2024

Materials

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This study employs the discrete element method to investigate the influence of particle size on the load-bearing characteristics of aggregates, with a specific emphasis on the aggregates used in escape ramp arrester beds. This study utilises the log edge detection algorithm to introduce an innovative approach for modelling irregularly shaped pebbles, integrating their physical properties into a comprehensive discrete element model to enhance the accuracy and applicability of simulations involving such pebbles. Meticulous validation and parameter calibration (friction coefficient: 0.37, maximum RMSE: 3.43) confirm the accuracy of the simulations and facilitate an in-depth examination of the mechanical interactions between aggregate particles at macroscopic and microscopic scales. The findings reveal a significant relationship between the particle size and load-bearing capacity of aggregates. Smaller pebbles, which are more flexible under pressure, can be packed more densely, thereby improving the distribution of vertical forces and increasing the concentration of local stress. This enhancement substantially increases the overall load-bearing capacity of aggregates. These discoveries hold significant implications for engineering practices, particularly in the optimisation of safety for truck escape ramps and in identifying the ideal sizes of pebbles with irregular shapes.

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