Three-dimensional bonded-particle discrete element modeling of mechanical behavior of transversely isotropic rock

Park, Bona; Min, Ki‐Bok; Thompson, Nicholas; Horsrud, Per

doi:10.1016/j.ijrmms.2018.07.018

Cited by 46 publications

(11 citation statements)

References 21 publications

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“…As we continue loading from 90% to 100% of the peak load, the number of broken bonds in the shear bands increases rapidly. Failure mode in uniaxial compression is influenced by end constrains [42,63] as well as sample microstructure [44,64]. The difference in failure mode between the experiments and the numerical simulation may indeed come from the boundary conditions: in the experiment, the rough surface of the sample is in contact with the rubber loading platen; in the simulation, a fixed lateral displacement was imposed at the interface between the sample an the loading platen, which is a stiffer end constraint.…”

Section: Ct Scanmentioning

confidence: 99%

DEM analysis on the role of aggregates on concrete strength

Wang

Gao

et al. 2020

Computers and Geotechnics

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Section: Ct Scanmentioning

confidence: 99%

DEM analysis on the role of aggregates on concrete strength

Wang

Gao

et al. 2020

Computers and Geotechnics

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“…The discrete element method proposed by Cundall [24] is very effective for analyzing the crack propagation process and explaining the types of cracks observed in the previous physical experiments. The parallel bond model based on the discrete element theory has been widely used in rock damage analysis for decades [25][26][27][28][29], and the numerical simulation results are generally in good agreement with the laboratory results. However, due to the lack of effective approaches, the current numerical model based on parallel bonding is not proficient in distinguishing the mechanical behaviors and types of cracked shear bands in the process of crack propagation and coalescence for several years.…”

Section: Introductionmentioning

confidence: 80%

Experimental and DEM Analysis on Secondary Crack Types of Rock-Like Material Containing Multiple Flaws Under Uniaxial Compression

Cai

et al. 2019

Applied Sciences

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To better understand the evolution of crack propagation in brittle rock mass, the particle velocity field evolution on both sides of secondary crack in rock-like materials (cement mortar specimens) with pre-existing parallel double flaws under uniaxial compression is analyzed based on the discrete element theory. By bringing in strain rate tensor, a new technique is proposed for quantifying the failure mechanism of cracks to distinguish the types and mechanical behaviors of secondary cracks between pre-existing parallel flaws. The research results show that the types and mechanical behaviors of secondary cracks are distinct at different axial loading stages and can be directly identified and captured through the presented approach. The relative motion trend between particles determines the types and mechanical behaviors of secondary cracks. Based on particles movement on both sides of secondary cracks between cracks, the velocity fields of particles can be divided into four types to further analyze the causes of different types of cracks. In different axial loading stages, the velocity field types of particles on both sides of cracks are continuously evolving. According to the particle velocity field analysis and the proposed novel way, the types of macroscopic cracks are not directly determined by the types of dominated micro-cracks. Under uniaxial compression, the particles between secondary cracks and pre-existing parallel flaws form a confined compressive member. Under the confinement of lateral particles, secondary cracks appear as shear cracks between pre-existing parallel flaws at the beginning stage of crack initiation.

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“…However, the established propellant mechanical model is rough and does not reflect the inner holes and stress concentration process of the gun propellant. The Hertz-Mindlin bonding contact model was proposed by Potyondy [11] in 2004, which was widely used in the material crushing simulation by the discrete element method [12][13][14] , including the crushing process of rock cone crusher and wheat milling process, and the test and simulation results were in good agreement. Rui [1][2]15] characterized the fracture of gun propellant by the initial dynamic vivacity ratio.…”

Section: Introductionmentioning

confidence: 96%

Study on impact damage mechanism of gun propellant based on bonding contact model

Zhang¹,

Zhang²,

Liu³

et al. 2023

J. Phys.: Conf. Ser.

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As the main launch energy of barrel weapon, the dynamic mechanical properties of gun propellant is very important to evaluate the launch safety. Through the transverse drop hammer impact damage test at room temperature and the initial dynamic vivacity ratio test of the propellant, the crack growth law and the fracture degree of the damaged propellant were obtained separately. Based on the Hertz-Mindlin bonding contact model, the discrete element mechanical model of the rosette 19-hole gun propellant was established, and the transverse drop hammer impact damage simulation was carried out. The damage mechanism of the bonding contact model and the fracture degree of the damaged propellant were acquired, which were also verified by tests. The results show that the bonding contact model can accurately describe the impact damage law of propellant. The research results of this paper can be used to predict the abnormal chamber pressure caused by fracture of propellant, provides a research means for mechanical property evaluation of 3D printing gun propellant, and lays a theoretical foundation for quantitative evaluation of launch safety.

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Three-dimensional bonded-particle discrete element modeling of mechanical behavior of transversely isotropic rock

Cited by 46 publications

References 21 publications

DEM analysis on the role of aggregates on concrete strength

DEM analysis on the role of aggregates on concrete strength

Experimental and DEM Analysis on Secondary Crack Types of Rock-Like Material Containing Multiple Flaws Under Uniaxial Compression

Study on impact damage mechanism of gun propellant based on bonding contact model

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