Sensitivity Analysis of Macroscopic Mechanical Behavior to Microscopic Parameters Based on PFC Simulation

Li, Guodong; Bodahi, Fatemeh; He, Tuan; Luo, Feng; Duan, Shuo; Li, Meng

doi:10.1007/s10706-022-02118-5

Cited by 16 publications

(2 citation statements)

References 17 publications

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“…This paper combines orthogonal experiments with a trial-and-error method to calibrate the microscopic parameters of the linear parallel bond model for the macroscopic parameters of elastic modulus ( E ), Poisson's ratio ( v ), and uniaxial compressive strength false( σ c false) of the sintered ore sample. 36,37 The correctness of the microscale parameters is to be validated by comparing the Brazilian tensile strength false( σ t false) of the sintered ore obtained from experiments and simulations. The uncertain input microscopic parameters include effective modulus ( Emod ), bonding effective modulus ( Pb_emod ), normal-to-shear stiffness ratio ( kratio ), bond normal-to-shear stiffness ratio ( Pb_kratio ), tensile strength ( Pb_ten ), cohesion ( Pb_coh ), friction angle ( Pb_fa ), and friction coefficient of particles ( fric ).…”

Section: Experimental and Simulationmentioning

confidence: 99%

Crushing mechanism analysis of sintered ore and study of particle size distribution pattern after crushing

Tang,

Dai,

Zhou

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

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To improve the crushing effect and reduce the range of particle size distribution after crushing, the crushing mechanism and the particle size distribution pattern after crushing of sintered ore under different roller rotation speeds are analysed in this paper. Based on the discrete element method, the microscopic parameters of sintered ore are calibrated and validated by uniaxial compression and the Brazilian splitting test. The initiation, propagation, and penetration of cracks inside the sintered ore are described by innovatively introducing the concept of compaction core and combining the force chain evolution. It reveals that the extension and penetration of radial cracks generated under the action of the tooth tip, along with the continuous formation and crushing of compacted cores, are the essence of crushing. The generation of new cracks originates from the tensile failure between particles in the region where tensile force chains are concentrated. Increasing the rotation speed properly can improve the crushing effect of sintered ore but also excessive rotation speed (4, 5, and 6 rad s−1) will hinder the main crack propagation path of sintered ore and deteriorate the crack penetration effect, which may inhibit the crushing effect of sintered ore in turn. The research results may have important implications for understanding the crushing mechanism of the sintered ore and optimising the crushing process.

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Section: Experimental and Simulationmentioning

confidence: 99%

Crushing mechanism analysis of sintered ore and study of particle size distribution pattern after crushing

Tang,

Dai,

Zhou

et al. 2024

Ironmaking & Steelmaking: Processes, Products and Applicati

View full text Add to dashboard Cite

show abstract

“…Therefore, it is necessary to calibrate the more accurate meso parameters before the test. However, the meso parameters required for PFC2D are difficult to be obtained through the indoor test, mesoscopic parameters can be obtained by "trial and error method" based on the mechanical parameters from the indoor uniaxial test, such as pressure resistance, elastic modulus, Poisson's ratio and other macro mechanical parameters (Castro-Filgueira et al, 2017;Li et al, 2022). Finally, a numerical model consistent with the laboratory test in strength parameters and failure modes is constructed.…”

Section: Parameter Calibrationmentioning

confidence: 99%

Temperature damage regularity of granite based on micro-inhomogeneity

Chen²,

Chen³

et al. 2022

Front. Earth Sci.

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Enhanced geothermal system (EGS) is the primary means during Dry Hot Rock development. It is necessary to build an underground heat exchange area during its construction, and the temperature of underground rock will change significantly, thus, the mechanical properties of those rocks underground will be affected. In order to judge whether the mechanical properties under temperature are related to the crystal structure of granite, we firstly used the crystalline rock heterogeneity coefficient H to describe the crystal structure of granite. Then, the discrete element software was used to construct the GBM equivalent crystalline model and the thermal temperature field coupling model. Finally, the temperature effect test was carried out to explore the law of heterogeneity coefficient H and damage and fracture development. The results show that: 1) the variation of granite heterogeneity coefficient H and temperature will lead to the decline of mechanical properties of rock samples. 2) At the same temperature, the damage value D increases with the increase of the H value. This phenomenon is more apparent when the temperature is greater than 400°C. 3) The microcracks caused by temperature change are mainly tensile. The H value increases the number of microcracks in the crystal. 4) The damage phenomenon caused by temperature change will be affected by heterogeneity. When the temperature is high, the crystal will denature, and the stress concentration caused by heterogeneity is easier to be reflected.

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Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid–Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors

Wang,

Zhou,

Zhang

et al. 2023

Rock Mech Rock Eng

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Sensitivity Analysis of Macroscopic Mechanical Behavior to Microscopic Parameters Based on PFC Simulation

Cited by 16 publications

References 17 publications

Crushing mechanism analysis of sintered ore and study of particle size distribution pattern after crushing

Crushing mechanism analysis of sintered ore and study of particle size distribution pattern after crushing

Temperature damage regularity of granite based on micro-inhomogeneity

Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid–Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors

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