Aug 21, 2009 · Design/methodology/approach Existing algorithms are compared against a quaternion‐based reparameterization of both the central difference algorithm and the approach of Munjiza et al. for finite/discrete element modeling (FEM/DEM)
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The discrete element method (DEM) is a numerical method that models the mesoscopic mechanical behaviour of granular materials. Many studies have made promising advances in the analysis of mechanical properties of nonbonded particle systems [1, 2].
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[]DELAMINATION ANALYSIS OF COMPOSITES USING A FINITE ELEMENT BASED DISCRETE DAMAGE ZONE MODEL Xia Liu, Ravindra Duddu, Haim Waisman Columbia University 610 Seeley W. Mudd Building, 500 West 120th Street New York, NY 10027 ABSTRACT We perform delamination analysis in laminated composites in 2D and 3D using the discrete
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This paper presents a novel virtual commissioning approach based on the Discrete Element Method. To save costs and reduce time at the commissioning phase, this technique offers a suitable tool to model complex behaviour of bulk material handling. This proposed approach of virtual commissioning is used for validating existing software code and solve an optimisation
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Discrete-element, individual-based and agent-based modelling techniques represent the interactions of individuals or entities with one another and their environments by sets of computational rules. These methods are now being used in geophysics,
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An imaging based Discrete Element Modeling (DEM) methodology is introduced to investigate effects of multiscale aggregate morphological properties on performances of granular assemblies, such as unbound aggregate layers used in railroad ballast and highway and airport pavement base courses.
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[]lattice-based, approaches have been developed in the framework of DEM applied to simulate solids. Particle-shaped approach presents a rather straightforward exten-sion of the original Discrete Element Method. In this pa-per, a solid is replaced by a composition of discrete parti-cles. Cohesive forces and various link and detachment
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One of the simplest settings for discrete logarithms is the group (Z p) ×. This is the group of multiplication modulo the prime p. Its elements are congruence classes modulo p, and the group product of two elements may be obtained by ordinary integer multiplication of the elements followed by
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A new discrete Kirchhoff‐Mindlin element based on Mindlin‐Reissner plate theory and assumed shear strain fields—part I An extended DKT element for thick‐plate bending analysis. Irwan Katili. Department of Civil Engineering, Universitas Indonesia, Kampus U.I. Depok 16424, Indonesia.
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[]3. Optimal Speed Model for SAG Mill Based on Discrete Element Method DEM has been used by many scholars to study the grinding mechanism and grinding performance of ball mills and SAG mills under di erent conditions. In this section, a simulation was carried out
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Inversion vector With the element-based definition () is the number of inversions whose smaller (right) component is . is the number of elements in greater than before .
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Development of a 3D hybrid finite-discrete element simulator based on GPGPU-parallelized computation for modelling rock fracturing under quasi-static and dynamic loading conditions. Rock Mechanics and Rock Engineering .
Get Price[]The discrete element method (DEM) and finite element method (FEM) are two different numerical methods based on two different approaches to material modelling. The finite element method is a discretization method in continuum problems and the equations of the discrete element
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Optimal Speed Model for SAG Mill Based on Discrete Element Method. DEM has been used by many scholars to study the grinding mechanism and grinding performance of ball mills and SAG mills under different conditions. In this section, a simulation was carried out by using DEM software to investigate the variation of speed with number and size of
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[]2 Prediction/Verification of particle motion in one dimension with. the discrete element method. The discrete (or distinct) element method (DEM) is a family of numerical methods for predicting. the motion of a large number of particles like molecules or particles of soil (Jensen et al.
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Oct 19, 2011 · In this work, a set of Discrete Element Method (DEM) simulations are performed based on a computer experimental design for the qualitative and quantitative characterization of a periodic section of a powder blender.
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[]NURBS-based Discrete Element Method The two major components of the proposed NURBS-based DEM are the use of NURBS for representing particle geometries, and the contact algorithm for determining the signed gap or penetration between two non-convex NURBS surfaces. We discuss these two components in detail in this chapter.
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CiteSeerX Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda) ABSTRACT Discrete element modelling (DEM) is an approach for the analysis of granular material response that explicitly considers the interaction between individual particles. With increasing computational speeds, the use of particle-based DEM is becoming more widespread amongst geotechnical engineers in both
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This study uses the discrete element method (DEM) to simulate the dynamic mechanical behaviour of asphalt mastics. Asphalt mastics are defined as dispersions of aggregate fillers within a medium of asphalt binder. The fillers refer to the fraction of mineral aggregate passing the 200-mesh sieve, (i.e. smaller than 75 μm). Mastic measurements obtained using the dynamic shear rheometer were
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Discrete Element Method (DEM), a well-known computational method for simulating large deformation and cracking issues, is utilised as a numerical platform to
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iDEM An impulse‐based discrete element method for fast granular dynamics Seung Jae Lee Department of Civil and Environmental Engineering, Florida International University, Miami, 33174 FL, USA
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[]The Continuum-based Distinct Element Method (CDEM) is an approach to simulate the progressive failure of geological mass, which is mainly used in landslide stability. evaluation, coal and gas outburst analysis, as well as mining and tunnel designing.
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The results of the research based on the discrete element method are analyzed by the regression method. The regression equation of the evaluation indexes is calculated by SPSS software, and the three-dimensional contour map is drawn by MATLAB.
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[]The Discrete Element Method has been first announced by Cundall & Strack [8] in 1979. It is based on mod-eling a granular medium from discrete particles without any fixed neighboring relation, thus the particles are free to move and contact each other in 6 DoF. Each particle's motion is then calculated out of the occurring contact forces.
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Sep 04, 2017 · How do you pad zeros to a discrete element-based Learn more about zero padding, signal processing Simulink
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[]Thus, the basic equation for finite element analysis is = 0 ∂ ∂. p F. where F is the energy functional and p is the unknow n grid point potential (In mechanics, the potential is displacement.) to be calculated.
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Discrete event simulation modeling should be used when the system under analysis can naturally be described as a sequence of operations at a medium level of abstraction. Discrete event simulation software is widely used in the manufacturing, logistics, and healthcare fields.
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LIGGGHTS is an Open Source Discrete Element Method Particle Simulation Software. LIGGGHTS stands for LAMMPS improved for general granular and granular heat transfer simulations. LAMMPS is a classical molecular dynamics simulator. It is widely used in the field of Molecular Dynamics. Thanks to physical and algorithmic analogies, LAMMPS is a very good platform for DEM simulations.
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A computer-vision based discrete element modeling approach characterized by using 3D polyhedron elements to represent realistic ballast particles, is introduced in this paper. Comparison between DEM simulations and laboratory direct shear tests demonstrates the reliability of this methodology.
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Discrete-element, individual-based and agent-based models Tools for interdisciplinary enquiry in geography?
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[]transverse displacements and the section rotations, or the element can be viewed as based on a 'discrete Mindlin/Reissner theory'. ELEMENT CHARACTERISTICS Based on our studies, we find the following important element properties (assuming 'full' numerical integration over r and s) 1. The element is able to represent the three rigid modes.
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The algorithm, which is based on the node-to-surface method used in finite element method, treats each spherical discrete element as a slave node and the surfaces of the finite element domain as the master surfaces. The contact force on the contact interface is processed by using a penalty function method.
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