Fractal breakage of porous carbonate sand particles: Microstructures and mechanisms

Li, H.Y.; Chai, H.W.; Xiao, Xianghui; Huang, J.Y.; Luo, Sheng‐Nian

doi:10.1016/j.powtec.2020.01.007

Cited by 50 publications

(7 citation statements)

References 60 publications

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“…Li analyzed the evolution of 3 D characterizations of particle breakage of coral sand. 26 Combined with the conclusions of Parab, 36 it can be inferred that the two main breakage patterns of coral sand have distinct differences, which are shown in Figure 11. The momentary collapse of a large number of particles during impact may cause short-term instability at the interface.…”

Section: Resultsmentioning

confidence: 66%

“…Lv also extensively studied the dynamic mechanical properties of coral sand compared with quartz sand in which the compressive behavior of dry and moist coral sand and breakage energy absorption of various particle sizes were investigated using the split Hopkinson pressure bar (SHPB) setup. 9,24,25 In addition, three-dimensional characterizations of particle breakage in porous coral sand were presented by Li, 26 and the results indicated that particles with a lower sphericity are more prone to break.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic mechanical behavior of different coral sand subjected to impact loading

Dong

Ren²,

Ruan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The mechanical performance of coral sand exhibits significant variation due to the different physical properties of coral sand sampled from individual coral reefs. In this paper, a split Hopkinson pressure bar (SHPB) apparatus is used to conduct impact tests on two types of coral sand to investigate mechanical behavior. Using this approach, compressive stress-strain curves of the one-dimensional strain state are obtained, with strain rates ranging from 460 s−1 to 980 s−1. The results show that the internal porosity of particles is the main influence factor on strain rate dependency of coral sand subjected to impact loading. Various crushing patterns of the two coral sands will result in different strength performance and friction effects, directly creating variations in the dynamic mechanical properties of moist coral sand. Crushing patterns also have a significant influence on yielding stress and the bulk modulus of the pseudo-elastic response but have little effect on the bulk modulus after yielding. In this paper, the varying dynamic mechanical properties are analyzed on typical brittle coral sand by investigating the dominant crushing pattern of the two sand varieties. The conclusions obtained also provide insight into the strain rate dependency of quartz sand.

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Section: Resultsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical behavior of different coral sand subjected to impact loading

Dong

Ren²,

Ruan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…The discrete element method (DEM) has been extensively used in railway engineering and also pavement engineering [14][15][16]. In order to analyze the evolution of fractal PSD using the fragment replacement method (FRM), the particle is represented by a group of smaller ones without bonding as implemented in [16][17][18][19][20][21]. McDowell et al [16] adopted octahedral shear stress as the fracture criterion and replaced broken spheres with smaller ones with overlap in their successful investigation of the evolution of fractal PSD for silica sand.…”

Section: Introductionmentioning

confidence: 99%

“…De Bono et al [20] conducted one-dimensional normal compression test simulation with different fracture criteria, and pointed out that both octahedral shear stress and the largest normal contact stress can lead to the correct normal compression lines and fractal PSDs. Li et al [21] quantified the evolution of microstructures of carbonate sands under mechanical loading and found that the fractal dimension of crack networks increased with external loading due to crack branching via cleavage.…”

Section: Introductionmentioning

confidence: 99%

“…Although the FRMs used in the above studies can accurately simulate particle breakage based on DEM, most of the parent breakable particles involved were spherical and so could hardly simulate the interlocking between particles [16][17][18][19][20][21]. However, particle shape plays a key role in the fractal behavior of ballast with irregular shapes [22,23].…”

Section: Introductionmentioning

confidence: 99%

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Discrete Element Modelling of Fractal Behavior of Particle Size Distribution and Breakage of Ballast under Monotonic Loading

et al. 2022

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Breakage of particles has a great influence on the particle size distribution (PSD) and the associated mechanical behavior of ballast under train loads. A discrete element method (DEM) simulation of triaxial testing under monotonic loading was carried out using FRM (fragment replacement method) breakable particles as ballast and a flexible shell model as membrane. The coupled model was validated by comparing the load-deformation responses with those measured in previous experiments and was then used to analyze the contact orientations and the distribution of particle breakage from a micromechanical perspective. The simulation results show that higher confining pressure and larger axial strain may increase the grain breakage (Bg) and the fractal dimension (D) of ballast. It was observed that most breakage was first-generation breakage, and that the proportions of the second- to fifth-generation breakage decreased successively. Moreover, as the axial strain or confining pressure increased, the percentage of small particle fragments increased in correspondence with the PSD curves that remained concave upwards, as the fractal dimension D of PSD increased. In addition, the evolution of D exhibited a linear correlation with grain breakage Bg. Contrarily, a quadratic curve relation between D and volumetric strain was exhibited under different axial strain stages. Therefore, D has the potential to be a key indicator to evaluate the degree of ballast crushing and PSD degradation, which may contribute to better decision making concerning track bed maintenance.

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Three-dimensional mesoscale modelling of the compressive behaviors of coral sand

Zhang

Fang

et al. 2022

Granular Matter

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Fractal breakage of porous carbonate sand particles: Microstructures and mechanisms

Cited by 50 publications

References 60 publications

Dynamic mechanical behavior of different coral sand subjected to impact loading

Dynamic mechanical behavior of different coral sand subjected to impact loading

Discrete Element Modelling of Fractal Behavior of Particle Size Distribution and Breakage of Ballast under Monotonic Loading

Three-dimensional mesoscale modelling of the compressive behaviors of coral sand

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