Discrete Element Modelling of Crushable Tube-Shaped Grains

Stasiak, M.; Combe, Gaël; Richefeu, Vincent; Villard, Pascal; Desrues, Jacques; Armand, Gilles; Zghondi, Jad

doi:10.1007/978-3-319-99474-1_35

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…This particular modelling choice requires 8 micromechanical inputs (two yield thresholds, four micro sti↵nesses, a friction coe cient and a shape of failure envelope). For a deeper explanation of the link and contact laws, the interested reader can turn to [10].…”

Section: Generation Of a Breakable Modelmentioning

confidence: 99%

“…In the field of discrete modelling there are many parameters of various character: (i) micro-mechanical inputs as introduced in Section 2, (ii) purely numerical parameters required by the algorithm, such as a time step or a frequency for rebuilding neighbourhood list, (iii) internal variables of the assembly (initial density, shell orientations, and so forth). A preliminary parameter choice has been made by bridging the shell-scale experiment and modelling [10]. No doubt our experimental endeavours to classify the variability of tensile strength, the angle of friction and a distribution shell orientation were substantial to the calibration process [11].…”

Section: Parameter Selectionmentioning

confidence: 99%

“…No doubt our experimental endeavours to classify the variability of tensile strength, the angle of friction and a distribution shell orientation were substantial to the calibration process [11]. Still, to complete a suitable parameter selection, it was necessary to probe the sensitivity of the model to many parameters at the sample-scale in an extensive modelling campaign [10,11]. Eventually, among many parameters, the compressive behaviour was found wholly subservient to two of them: the initial density and the tensile strength of shell ( f ?…”

Section: Parameter Selectionmentioning

confidence: 99%

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High compressibility caused by particle breakage: a DEM investigation

et al. 2021

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This paper summarises the numerical and experimental studies of brittle, hollow, cylindrical particles, called shells. It addresses the influence of shell properties both at the particle and assembly scales. Extreme compressibility has been recorded in the oedometer tests. Due to the large internal porosity of the shell, the breakage phenomena lead to highly compressive deformations with a significant stress dissipation. Using the Discrete Element Method (DEM), we have investigated in depth the micro-mechanical phenomena governing this macroscopic response. By quantifying the breakage and separating the double-porosity of the material, the foundations of a future constitutive model have been established throughout a simple prediction model applicable to the engineering practice.

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Section: Generation Of a Breakable Modelmentioning

confidence: 99%

Section: Parameter Selectionmentioning

confidence: 99%

Section: Parameter Selectionmentioning

confidence: 99%

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High compressibility caused by particle breakage: a DEM investigation

et al. 2021

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High compression of granular assemblies of brittle hollow tubular particles: investigation through a 3D discrete element model

et al. 2022

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High compression of granular assemblies of brittle hollow tubular particles

Stasiak¹,

Combe²,

Richefeu³

et al. 2021

Preprint

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This paper is devoted to the micro-mechanical origins of the high compressibility of brittle tubular particle assemblies. The material is extremely porous due to the presence of a large hole within the tube-shaped particle. The release of the inner void, protected by a fragile shell, gives the material a very strong ability to compress. The compressive response is investigated by means of the Discrete Element Method, DEM, using crushable-elements. To address the complexity of the model, a step-by-step break-down is developed.The paper comprises the comparison of the numerical results with both results obtained by the authors and existing experiments. With the insights provided by the DEM, we have sought to better understand the phenomena that originate at the grain scale, and that govern macroscopic behaviour. Grain breakage was proven to control the compressive behaviour, and thus, the importance of internal pores dominates the inter-particle voids. Then, a novel concept of compressibility analysis has been proposed using the separation of the double porosity and the quantification of the pore collapse through primary grain breakage. Finally, a general, geometrical development of a semi-analytical model has been proposed aiming the prediction of the evolution of double porosity vs axial strain.

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Discrete Element Modelling of Crushable Tube-Shaped Grains

Cited by 3 publications

References 15 publications

High compressibility caused by particle breakage: a DEM investigation

High compressibility caused by particle breakage: a DEM investigation

High compression of granular assemblies of brittle hollow tubular particles: investigation through a 3D discrete element model

High compression of granular assemblies of brittle hollow tubular particles

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