Characterization and discrete element simulation of grading and shape-dependent behavior of JSC-1A Martian regolith simulant

Lai, Zhengshou; Chen, Qiushi

doi:10.1007/s10035-017-0754-1

Cited by 27 publications

(7 citation statements)

References 49 publications

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“…Therefore, we can judge whether there are cracks in the measuring area according to the decrease of coordination numbers. Theoretically, the methodology is suitable for any case where the background medium shares the same or almost the same coordination numbers, even if DEs are in hexagonal, orthogonal, or polydisperse packings with a minimal size ratio that represents different material types, such as rocks (Liu and Fu, 2020b), concrete (Nitka and Tejchman, 2015), or even Martian regolith (Lai and Chen, 2017). In other words, the modeled matrix could be isotropic or anisotropic in 2D or 3D, as long as the measurement window placement is optimized.…”

Section: Measurement Window Generation and Coordination Number Estimationmentioning

confidence: 99%

On the Determination of Coordination Numbers of Coupled DEM-DFN Model for Modeling Fractured Rocks

Liu

Han

2021

Front. Earth Sci.

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Natural fractured rocks usually contain background granular media and multi-scale fractures. The coordination number is a crucial factor to characterize the connection of microstructural elements. The determination of coordination numbers for modeling fractured rocks is essential to interpret the distribution of cracks related to micromechanical properties. We have built a consistent workflow of discrete element models (DEMs) coupled with discrete fracture networks (DFNs). This DEM-DFN model could provide a simple formulation for high calculation efficiency to model a more realistic and detailed description of fracture system. A series of numerical experiments are set up, aiming to correlate window radius, particle size, and crack length, which will benefit the window selection for measuring coordination numbers based on the crack characteristics. The coordination number determined in the DEM-DFN modeling can be used to identify crack patterns in the spatial distribution.

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Section: Measurement Window Generation and Coordination Number Estimationmentioning

confidence: 99%

On the Determination of Coordination Numbers of Coupled DEM-DFN Model for Modeling Fractured Rocks

Liu

Han

2021

Front. Earth Sci.

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“…DEM has been used to examine the macroscopic behaviour of regolith resulting from individual particle interactions in the microscopic scale. The fundamental physics of regolith, such as shape-dependent behaviour [ 25 ] and shear band formation [ 26 ], as well as practical aspects including regolith excavations [ 27 ], sampling processes [ 28 , 29 ] and wheel–regolith interactions [ 30 , 31 , 32 ], have also been explored. Additionally, DEM has been used for regolith drilling studies, including creating a heat transfer model [ 33 ], analysing penetration resistance [ 34 ] and for the design of lunar coring bits [ 35 ].…”

Section: Methodsmentioning

confidence: 99%

Development of the Third Generation of the Dual-Reciprocating Drill

et al. 2020

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The dual-reciprocating drill (DRD) is a low-mass alternative to traditional drilling techniques biologically inspired by the wood wasp ovipositor, which is used to drill into wood in order to lay its eggs. The DRD reciprocates two halves lined with backwards-facing teeth, enabling it to generate traction forces that reduce the required overhead penetration force. While previous research has focused on experimental testing of the drill’s operational and design parameters, numerical simulation techniques are being developed to allow the rapid testing of multiple designs, complementing and informing experimental testing campaigns. The latest DRD design iteration integrated a novel internal actuation mechanism and demonstrated the benefits of adding controlled lateral movements. This paper presents an exploration of how bit morphology affects drilling performance and a preliminary study of discrete element method (DEM) simulations for modelling DRD interactions in regolith. These have shown how regolith grain size and microscopic behaviour significantly affects the performance of different drill designs, and demonstrated how customisable drills can exploit the properties of various substrates. Two system prototypes are also being developed for the DRD’s third generation, each utilising novel actuation and sampling mechanisms. A final drill design will then be deployed from a planetary rover and perform the first DRD drilling and sampling operation.

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“…Particle shape representation and reconstruction are becoming increasingly important for numerical investigations of particle morphology and its effects on micro-macro mechanical behavior [1,[30][31][32]. Clumps, clusters and polyhedrons have typically been used in discrete element modeling to represent a realistic shape, along with developed overlapping or skeletonization algorithms (e.g.…”

Section: Particle Shape Reconstructionmentioning

confidence: 99%

Internal rolling method for particle shape evaluation and reconstruction

2020

PLoS ONE

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A concise and robust method for 2D particle shape evaluation and reconstruction is proposed using the concept of the internal rolling of covering discs within the outline of a particle. By downscaling the covering disc size for capturing multiscale features, the calculation of the Euclidean distance can effectively yield three indices for sphericity, roundness and roughness. The geometric-based evaluations of particle morphology are dimensionless and precisely distinguishable between shapes after calibration and validation against constructed particles and natural sands. A sphericity-roundness diagram is provided to visualize the particle shape characterization, and a probabilistic density surface in the sphericity-roundness diagram is then proposed to statistically represent the distributions of the particle shapes. The concept of internal rolling is also utilized for particle shape reconstruction using a limited number of balls to replicate the indices of sphericity, roundness and roundness characteristic curve. The probabilistic density surface is duplicated for statistical particle shape reconstruction, which provides an effective approach for numerical investigations of the relationships between particle shapes and mechanical behavior. The effect of image quality on 2D shape evaluation is also examined by using a minimum area per particle, and the proposed method is intuitively extendable to 3D measurements using rolling covering spheres.

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Characterization and discrete element simulation of grading and shape-dependent behavior of JSC-1A Martian regolith simulant

Cited by 27 publications

References 49 publications

On the Determination of Coordination Numbers of Coupled DEM-DFN Model for Modeling Fractured Rocks

On the Determination of Coordination Numbers of Coupled DEM-DFN Model for Modeling Fractured Rocks

Development of the Third Generation of the Dual-Reciprocating Drill

Internal rolling method for particle shape evaluation and reconstruction

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