The importance of modelling ballast particle shape in the discrete element method

Lü, Mengkai; McDowell, G. R.

doi:10.1007/s10035-006-0021-3

Cited by 279 publications

(155 citation statements)

References 11 publications

Supporting

Mentioning

153

Contrasting

Unclassified

Order By: Relevance

“…However, in other research fields, PFC has also been utilized to simulate 3D blocks with irregular geometry. Lu et al proposed a modeling method in which overlapping balls were used to form clumps using a simple procedure that controls the sphericity, angularity and surface texture of the clump to model the real ballast particles (Lu and McDowell 2007). Using a high-resolution scanner, You et al (2008) captured the 2D microstructure of the asphalt concrete mixture, and a 3D model at a depth of 32 mm was generated by using four 2D models, each of which was duplicated 12 times, approximately 8 mm deep.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the failure process of soil–rock mixtures through computed tomography and PFC3D models

Sun

Xing

et al. 2018

Int J Coal Sci Technol

View full text Add to dashboard Cite

Soil-rock mixture (SRM) is a unique type of geomaterial characterized by a heterogeneous composition and a complicated structure. It is intractable for the continuum-based soil and rock mechanics theories to accurately characterize and predict the SRM's mechanical properties. This study reports a novel numerical method incorporating microfocus computed tomography and PFC3D codes to probe the deformation and failure processes of SRM. The three-dimensional (3D) PFC models that represent the SRM's complex structures were built. By simulating the entire failure process in PFC3D, the SRM's strength, elastic modulus and crack growth were obtained. The influence of rock ratios on the SRM's strength, deformation and failure processes, as well as its internal mesoscale mechanism, were analyzed. By comparing simulation results with experimental data, it was verified that the 3D PFC models were in good agreement with SRM's real structure and the SRM's compression process, deformation and failure patterns; its intrinsic mesomechanism can be effectively analyzed based on such 3D PFC models.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the failure process of soil–rock mixtures through computed tomography and PFC3D models

Sun

Xing

et al. 2018

Int J Coal Sci Technol

View full text Add to dashboard Cite

show abstract

“…It is also possible to use the actual values of the coefficient of friction between the particles and the machine elements, obtained from the measurements. The importance of particle shape in DEM modeling has been highlighted in works of many authors (McDowell et al, 2011;Lu & McDowell, 2006). The big disadvantage is the significant increase in computation time.…”

Section: Simulation Model Setup 221 Materials Modelingmentioning

confidence: 99%

Modeling and Simulation of Coal Loading by Cutting Drum in Flat Seams

Gospodarczyk

2016

Archives of Mining Sciences

View full text Add to dashboard Cite

This paper presents a methodology for modeling work of a coal shearer work in low longwall coal seams where the wall height does not exceed 1.5 m. In such conditions, an important issue is the process of loading the ore from shearer cutting drum on an armored face conveyor and selection of appropriate kinematic parameters to avoid choking. Discrete element method was used to model coal seam. This method allows for efficient simulation of physical systems composed of many separate components. Methods and algorithms based on existing theoretical models were developed to imitate coal cutting process. Main focus of analysis was put on coal stream movement for different variants of the shearer construction and kinematic parameters.Keywords: discrete element method, longwall mining, shearer, armored face conveyor W artykule przedstawiono metodykę modelowania pracy kombajnu ścianowego w niskich pokładach węglowych, w których wysokość ściany nie przekracza 1,5 m. W takich warunkach, istotnym problemem jest proces ładowania urobku na współpracujący z kombajnem przenośnik zgrzebłowy i dobór parametrów kinematycznych tak, aby nie doszło do zadławienia się organu. Ma to szczególne znaczenie w wyrobiskach niskich gdzie tak zwana furta ładowania jest wymiarowo/gabarytowo ograniczona. Do zamodelowania calizny wykorzystana została metoda elementów dyskretnych, pozwalająca na efektywne odzwierciedlenie układów fizycznych składających się z wielu odrębnych elementów. Opracowano metody i algorytmy pozwalające na imitację urabiania w oparciu o istniejące modele teoretyczne a główny nacisk położono na analizę ruchu strugi odspojonego urobku dla różnych wariantów pracy kombajnu i parametrów kinematycznych.Słowa kluczowe: metoda elementów dyskretnych, system ścianowy, kombajn, przenośnik zgrzebłowy

show abstract

“…The influence of grain morphology, including size and shape on the overall response of granular materials has been previously investigated by means of experimental and numerical methods (e.g. Oda & Iwashita, 1999;Lu & McDowell, 2007;Vlahinić et al, 2014;Nguyen, et al, 2015). There are, however, very few studies on the effect of single grain morphology and contact topology on contact interaction (Cavarretta et al, 2010;Wang & Coop, 2016).…”

Section: Introductionmentioning

confidence: 99%

Single-Grain Virtualization for Contact Behavior Analysis on Sand

Nadimi

Fonseca

2017

J. Geotech. Geoenviron. Eng.

View full text Add to dashboard Cite

This is the accepted version of the paper.This version of the publication may differ from the final published version. outline of the grain is required. The volumetric object is obtained by reconstructing the planar projections of the grain acquired at different angles of rotation using a standard camera. Depending on the lenses system, the resolution of the images can be as good as of a few microns. A numerical representation of the real grain can be obtained by meshing the 3D image. The influence of grain morphology on contact behaviour of a quartz sand is investigated here as an application for this novel technique. Numerical simulations using a finite-element model were carried out to reproduce the experimental data from normal compression single grain tests. The results show the contribution of the initial grain rearrangement on the normal force:displacement response and its strong dependency on the shape of the grain. This study demonstrates that particle shape is a critical parameter for calibration of contact behaviour of sand. Permanent repository link

show abstract

The importance of modelling ballast particle shape in the discrete element method

Cited by 279 publications

References 11 publications

Numerical analysis of the failure process of soil–rock mixtures through computed tomography and PFC3D models

Numerical analysis of the failure process of soil–rock mixtures through computed tomography and PFC3D models

Modeling and Simulation of Coal Loading by Cutting Drum in Flat Seams

Single-Grain Virtualization for Contact Behavior Analysis on Sand

Contact Info

Product

Resources

About