Numerical Investigation of the Cushion and Size Effects During Single-Particle Crushing via DEM

Kuang, Dumin; Long, Zhilin; Guo, Ruiqi; Yu, Piao-yi; Zhou, Xu-tong; Wang, Jie

doi:10.1007/s10338-020-00191-y

Cited by 15 publications

(6 citation statements)

References 28 publications

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“…Furthermore, the 𝑃 c of medium-sized (1.0-1.5 mm) particles were 1.3 and 1.1 times larger compared to particles within size range of 1.5-2.0 mm and 2.0-2.5 mm, respectively. This was because of larger particles commonly have higher coordination numbers compared to smaller particles (Kuang et al 2020). This induces that the larger particles have more contacts and lower deviatoric stress than smaller particles (Salami et al 2019).…”

Section: Absolute Particle Crushing Probabilitymentioning

confidence: 99%

Undrained SHPB experiments on calcareous sand with different saturation degrees

Su,

Wang,

et al. 2024

Preprint

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Extensive research has been conducted on the impact behavior of unsaturated sand at high strain rates. However, achieving the undrained boundary condition remains a persistent challenge, leading to an inconsistent understanding of the dynamic responses of sand with varying saturation degrees. In this study, a novel sleeve designed to conduct Split Hopkinson Pressure Bar (SHPB) tests under undrained boundary conditions. Furthermore, drained SHPB tests were carried out by using the conventional steel sleeve as references. The absolute particle crushing distributions within various size ranges were investigated by utilization of dyed calcareous sand. Results revealed that, for the conventional drained sleeve, the locking-up phenomenon of full saturation sand was only observed at strain rate of 750 s− 1. However, locking-up occurs at all strain rates for undrained sleeve. The locking-up stiffness at strain rate of 750 s− 1 was 1.2 and 2.9 times larger compared to that at strain rate of 500 s− 1 and 250 s− 1, respectively. The locking-up stiffness increase with increasing strain rates under the fully undrained boundary conditions. Moreover, for the drained sleeve, negligible reductions on Br up to 10.8% were observed in measured Br if saturation degrees change from 0–100%. In contrast, for the undrained sleeve, the maximum reduction on Br was 47.6% and increases rapidly with increasing strain rates. The particle crushing was more sensitive to saturation degree at higher loading strain rates under undrained boundary conditions.

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Section: Absolute Particle Crushing Probabilitymentioning

confidence: 99%

Undrained SHPB experiments on calcareous sand with different saturation degrees

Su,

Wang,

et al. 2024

Preprint

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“…Further, the dark green particles in D-II maintained relatively good integrity. Tis can be explained by the fact that this particle was wrapped and supported by surrounding particles, which produced an efect similar to confning pressure-reducing the uneven distribution of internal stress in the large particle and limiting its rotation and movement, thereby exerting a bufering efect on particle breakage [15,31].…”

Section: Evolutionary Law For Modes Of Breakagementioning

confidence: 99%

“…A comparison between the experimental and simulated results revealed good agreement between the two, indicating the viability of DEM as an effective tool to predict breakage behaviours of granular materials. Kuang et al [15] studied the efects of size and coordination number (CN) on particle breakage. Tey found that the tensile strengths of particles decrease with an increase in size and increase with an increase in the CN.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study of Breakage in Coral Sand Particles under Dynamic Confined Compression

Wang

Zhang

Chen

et al. 2023

Shock and Vibration

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This paper reports a simulation-based dynamic confined compression analysis of coral sand under an impact load using the discrete element method (DEM). The evolution of particle breakage on the mesoscale was studied by investigating force chain distributions, crack development, and breakage modes. Crushable sand particles were simulated by replacing rigid particles with flexible basic unit aggregates. The Weibull parameters were incorporated within the mesoscopic parameters of particles, and random numbers were introduced. The obtained results for particle strengths were consistent with the experimental data. The numerical results demonstrated that the force chain was significantly strengthened along the loading axis during loading and weakened during unloading. The cracks were primarily generated along the strong force chain, and particle breakage caused the strong force chain to move towards relatively more complete fragments nearby. The crack was primarily oriented along the loading axis, and its anisotropy was observed to decrease with an increase in the load. Before yielding, particle breakage in the specimen was dominated by attrition at the edges and corners. After yielding, the crack extended into the particle perpendicular to the intergranular contact surface and was deflected by the simultaneous influence of pores. The fracture and shattering of particles occurred successively, and the consequent fall-off and slip filling of the fragments promoted the deformation development.

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“…Particle carrying capacity can be measured by the maximum loading force [40][41][42]. In this work, the average loading force F ca is selected to represent particle carrying capacity:…”

Section: Stress and Carrying Capacitymentioning

confidence: 99%

“…In order to simulate the size effect of particles, Lim et al [39] proposed a method, in which the original flaws can be produced by deleting 0% to 25% elementary balls randomly. Wang et al [40] and Kuang et al [41,42] reproduced the distribution of single-particle strength based on Lim's method and investigated the relationship between particle strength and coordination number, while in fact, the inner porosity of most granular materials is less than 5%, and the introduction of original flaws by removing elementary balls will result in a statistical deviation of both void ratio and equivalent fragment diameter in DEM simulations. Therefore, the rationality of deleting elementary balls deserves further discussing.…”

Section: Introductionmentioning

confidence: 99%

DEM Analysis of Single-Particle Crushing Considering the Inhomogeneity of Material Properties

Zhang

Huang

2021

Acta Mech. Solida Sin.

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Crushing characteristics of single particles are the basis of granular material simulation with discrete element method (DEM). To improve the universality and precision of crushable DEM model, inhomogeneous stiffness and strength properties are introduced into the bonded particle method, with which the Weibull distribution and size effect of particle strength can be reproduced without deleting elementary balls. The issues of particle strength and carrying capacity under complex contact conditions are investigated in this work by symmetric loading tests, asymmetric loading tests, and ball–ball loading tests. Results of numerical experiments indicate that particle carrying capacity is significantly influenced by coordination numbers, the symmetry of contact points, as well as the relative size of its neighbors. Contact conditions also show impact on single-particle crushing categories and the origin position of inner particle cracks. The existing stress indexes and assumptions of particle crushing criterion are proved to be inappropriate for general loading cases. Both the inherent inhomogeneity and contact conditions of particles should be taken into consideration in the simulation of granular materials.

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Numerical Investigation of the Cushion and Size Effects During Single-Particle Crushing via DEM

Cited by 15 publications

References 28 publications

Undrained SHPB experiments on calcareous sand with different saturation degrees

Undrained SHPB experiments on calcareous sand with different saturation degrees

Simulation Study of Breakage in Coral Sand Particles under Dynamic Confined Compression

DEM Analysis of Single-Particle Crushing Considering the Inhomogeneity of Material Properties

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