Numerical simulation of the impact-breakage behavior of non-spherical agglomerates

Zheng, Kaiyu; Du, Chenglie; Li, Jianping; Qiu, Bingjing; Fu, Lin Zhi; Dong, Jiawei

doi:10.1016/j.powtec.2015.08.041

Cited by 46 publications

(26 citation statements)

References 25 publications

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“…e particle shape affects the loading modes and breakage process, resulting in the change of breakage characteristics and energy characteristics [9,10]. e impact breakage characteristics of nonspherical coal were studied by Zheng et al [11] using discrete element method (DEM) simulation with the parallel-bond model of primary particles.…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

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Particle shape and size are main factors influencing particle breakage. Single-particle breakage tests were conducted on irregular magnetite ore using modified drop weight impact equipment to analyze the effect of shape and size on specific breakage energy. A method to measure the effective breakage energy is presented. Ore particles with different sphericities and different sizes were broken into several fragments with differing impact energies in the tests. Experimental studies indicate that the shape of particles significantly influences the impact loading mode and breakage progress; the specific breakage energy has an obvious relationship with the sphericity and the initial size. The specific breakage energy decreases with larger initial loading area. The particle needs less specific breakage energy if the shape or placement state is more conducive to tensile fracture. There is an increase in specific breakage energy corresponding to an increase in particle sphericity with fixed initial size range. With the increase in the initial size of the particle, the specific breakage energy decreases with fixed sphericity range, which presents a power function with the exponent −0.5. The comprehensive relationship between specific breakage energy, particle sphericity, and initial size was established, showing that the input power of the crushing machinery and the optimization of crushing technology should be performed with consideration of the influence of particle shape and initial size to reduce specific energy consumption and improve energy efficiency.

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Section: Introductionmentioning

confidence: 99%

“…e samples were washed and air-dried; the mass of the dry samples was 55-1082 g (Figure 1). [10,11,13,14]. e formula of sphericity is given by…”

Section: Introductionmentioning

confidence: 99%

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Gan

Gao

Zhang

et al. 2019

Shock and Vibration

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“…The brittle and semi-brittle breakage processes can be approximated well using the BPM. Three regions of the proportion of the elastic modulus of bond E b to the elastic modulus of particle E can be distinguished: E b = E [25][26][27], E b > E [28], and E b < E [3,29]. For E b ≥ E, the DEM models provide typical brittle behaviour, characterised by a rapid decrease of the force-displacement response [27].…”

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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“…erefore, it is critical to select appropriate mesoparameters for the numerical model that aims to represent the accurate macroscale mechanical behavior of HCR. e calibration approach is used to determine these appropriate mesoparameters, and the detailed calibration procedure [37,38] has been demonstrated in Figure 14, which is described in detail as follows: (3) Conduct uniaxial compression simulations on the 3D DE model of HCRs to determine the mesomechanical parameters. (4) e calculated simulation and experimental parameters were compared, which aims to calibrate the mesoparameters of HCRs.…”

Section: D Image-based De Model Generationmentioning

confidence: 99%

3D XCT Mesostructure Characterization and Image‐Based Discrete Element (DE) Modelling of Failure Patterns in Coal Gangue Particles (CGPs)

Zheng

Qiu

et al. 2019

Complexity

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The paper presents an application of milli- and micro-XCT to mesostructure characterization of CGPs and failure patterns analysis using dynamic impact simulations. In this study, XCT scanning experiments are firstly conducted on CGPs, followed by a series of image analyses with qualitative results. Then, the 3D mesomorphological parameters and internal composition of individual particles are quantitatively characterized. Finally, dynamic impact loading in y-axis direction is modelled to investigate the 3D mesostructure and different impact velocity effects on failure patterns of individual particles. The studies show that the mesomorphological parameters present different distribution characteristics in individual CGPs. The approximate location of gangue phase is the key parameter that should be taken into account to study failure patterns as well as fracture mechanism of the heterogeneous rock materials. The XCT image-based numerical model proved to be an effective tool that gives insights into the mesodeformation mechanisms of heterogeneous coal rock (HCR) undergoing dynamic impact failure behavior.

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Numerical simulation of the impact-breakage behavior of non-spherical agglomerates

Cited by 46 publications

References 25 publications

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Effects of the Shape and Size of Irregular Particles on Specific Breakage Energy under Drop Weight Impact

Discrete Element Method Modelling of the Diametral Compression of Starch Agglomerates

3D XCT Mesostructure Characterization and Image‐Based Discrete Element (DE) Modelling of Failure Patterns in Coal Gangue Particles (CGPs)

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