Calibration Of Dem Models For Granular Materials Using Bulk Physical Tests
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Examining the Use of Idealized Granular Material in Validated DEM Simulations
Author | : Anjana Thoroppady Kittu |
Publisher | : |
Total Pages | : 280 |
Release | : 2018 |
Genre | : Discrete element method |
ISBN | : |
Discrete element method (DEM) modeling, is becoming widely used for understanding the micro-mechanical behavior of granular materials at the particle level. This dissertation presents important considerations regarding the experimental boundary conditions and idealized granular materials used in DEM validations. A common issue in DEM validation studies for direct shear and direct simple shear is selecting top and bottom cap boundary conditions that allow for shear transmission while also being efficiently modeled in the DEM simulations. While the traditional grid boundary types used in the laboratory can be replicated in the numerical models, researchers have also used fixed-particle boundaries, sawtooth boundaries, and high friction boundaries with no projections. To examine any effects from these boundaries at the macro-scale, direct shear tests on physical specimens of dense and loose sand, and dense and loose steel ball bearings were conducted. The influence of friction on the boundary was further examined at the particle scale using two simple DEM simulations replicating the physical steel ball bearing specimens with a high and a low friction coefficient on the top and bottom boundaries. The DEM stress-displacement responses are compared to the laboratory results for tests using the boundary plates with no projections and then the particle-scale results of the validated simulations are analyzed. In addition to boundary effects, the idealized materials used in validation studies were also examined. Commonly used steel ball bearings or glass ballotini restrict the direct comparison of DEM simulations to spherical particles, thus limiting understanding of real materials with more complex shapes. This study shows that additive manufacturing (AM) can be used to create analogue soils with a variety of shapes which can be used for DEM validations. The AM particles were characterized to ensure their suitability for laboratory testing and to determine the material properties to input into future DEM models. The second part of the dissertation describes the determination of material properties and surface characteristics of two AM materials. Because a Hertzian contact law is typically used in DEM models, a comparison of the materials' response under uniaxial compression and the theoretical response for Hertzian behavior was carried out.
Developing a Virtual Test Environment for Granular Materials Using Dem
Author | : Liang Cui |
Publisher | : LAP Lambert Academic Publishing |
Total Pages | : 392 |
Release | : 2010-10 |
Genre | : |
ISBN | : 9783843362351 |
Discrete element methods (DEM) are promising numerical methods for analysing the complexities of granular material response as they can consider the particle scale interactions in these materials. In this book a virtual test environment was developed for granular materials using DEM. Two fundamental geotechnical laboratory tests, the direct shear test and the triaxial test, were implemented in this virtual test environment. This test environment was validated by comparing simulation results with physical experiment results. Further DEM simulations were then performed to analyse the sensitivity of the macro-scale specimen response to some selected parameters (e.g. particle friction, size distribution). Using the results of the DEM simulations, comprehensive analyses of the particle scale parameters were performed to explore the relationship between the observed macro-scale specimen response and the particle scale interactions, including the internal stresses, the contact forces, the fabric, and the particle displacements.
Simulations in Bulk Solids Handling
Author | : Don McGlinchey |
Publisher | : John Wiley & Sons |
Total Pages | : 277 |
Release | : 2023-01-20 |
Genre | : Technology & Engineering |
ISBN | : 352783592X |
Simulations in Bulk Solids Handling Valuable resource for engineers and professionals dealing with bulk granular or powdered materials across industries using Discrete Element Methods (DEM) In many traditional university engineering programmes, no matter whether undergraduate or postgraduate, the behavior of granular materials is not covered in depth or at all. This omission leaves recent engineering graduates with little formal education in the major industrial area of bulk solids handling. This book teaches young professionals and engineers to find appropriate solutions for handling granular and powdered materials. It also provides valuable information for experienced engineers to gain an understanding and appreciation of the most significant simulation methods–DEM chief amongst them. For any student or professional involved with bulk solids handling, this book is a key resource to understand the most efficient and effective stimulation methods that are available today. Its comprehensive overview of the topic allows for upcoming professionals to ensure they have adequate knowledge in the field and for experienced professionals to improve their skills and processes.
Proceedings of the 7th International Conference on Discrete Element Methods
Author | : Xikui Li |
Publisher | : Springer |
Total Pages | : 1414 |
Release | : 2016-12-01 |
Genre | : Science |
ISBN | : 9811019266 |
This book presents the latest advances in Discrete Element Methods (DEM) and technology. It is the proceeding of 7th International Conference on DEM which was held at Dalian University of Technology on August 1 - 4, 2016. The subject of this book are the DEM and related computational techniques such as DDA, FEM/DEM, molecular dynamics, SPH, Meshless methods, etc., which are the main computational methods for modeling discontinua. In comparison to continua which have been already studied for a long time, the research of discontinua is relatively new, but increases dramatically in recent years and has already become an important field. This book will benefit researchers and scientists from the academic fields of physics, engineering and applied mathematics, as well as from industry and national laboratories who are interested in the DEM.
Geomechanics from Micro to Macro
Author | : Kenichi Soga |
Publisher | : CRC Press |
Total Pages | : 1668 |
Release | : 2014-08-26 |
Genre | : Technology & Engineering |
ISBN | : 1315737329 |
Geomechanics from Micro to Macro contains 268 papers presented at the International Symposium on Geomechanics from Micro and Macro (IS-Cambridge, UK, 1-3 September 2014). The symposium created a forum for the dissemination of new advances in the micro-macro relations of geomaterial behaviour and its modelling. The papers on experimental investigati
Calibration and Validation of Granular Continuum Models from Particle Data
Author | : Stefan Luding |
Publisher | : Elsevier |
Total Pages | : 150 |
Release | : 2017-11-01 |
Genre | : Technology & Engineering |
ISBN | : 0081012071 |
Calibration and Validation of Granular Continuum Models from Particle Data: Bridging the Micro-Macro Gap reviews recent advances in the field and describes how to obtain continuum fields from particle level data. After a review of several methods, it focuses on one method, coarse-graining, and demonstrates the power of this method via various examples of granular continuum models, e.g., for shallow and segregating flows. Presents the coarse-graining method to overcome accurate result challenges by applying a local smoothing kernel with a well-defined smoothing length that automatically generates fields satisfying the continuum equations Presents a very flexible solution that can be extended to complex situations, such as two-phase flows and situations with complex external boundaries Shows readers how to apply such methods to calibrate and validate some of the most common granular flow models
Discrete-element Modeling of Granular Materials
Author | : Farhang Radjaï |
Publisher | : Wiley-ISTE |
Total Pages | : 0 |
Release | : 2011-05-03 |
Genre | : Mathematics |
ISBN | : 9781848212602 |
This book brings together in a single volume various methods and skills for particle-scale or discrete-element numerical simulation of granular media. It covers a broad range of topics from basic concepts and methods towards more advanced aspects and technical details applicable to the current research on granular materials. Discrete-element simulations of granular materials are based on four basic models (molecular dynamics, contact dynamics, quasi-static and event driven) dealing with frictional contact interactions and integration schemes for the equations of dynamics. These models are presented in the first chapters of the book, followed by various methods for sample preparation and monitoring of boundary conditions, as well as dimensionless control parameters. Granular materials encountered in real life involve a variety of compositions (particle shapes and size distributions) and interactions (cohesive, hydrodynamic, thermal) that have been extensively covered by several chapters. The book ends with two applications in the field of geo-materials.
Particulate Discrete Element Modelling
Author | : Catherine O'Sullivan |
Publisher | : CRC Press |
Total Pages | : 574 |
Release | : 2011-04-06 |
Genre | : Technology & Engineering |
ISBN | : 1482266490 |
The first single work on DEM providing the information to get started with this powerful numerical modelling approach. Provides the basic details of the numerical method and the approaches used to interpret the results of DEM simulations. It will be of use to professionals, researchers and higher level students, with a theoretical overview of DEM as well as practical guidance.Selected Contents: 1.Introduction 2.Use of DEM in Geomechanics 3.Calculation of Contact Forces 4.Particle Motion 5.Particle Types 6.Boundary Conditions 7.Initial Geometry and Specimen Generation 8.Time Integration and Discrete Element Modelling 9.DEM Interpretation: A Continuum Perspective 10.Postprocessing: Graphical Interpretation of DEM Simulations 11.Basic Statisti
3D Discrete Element Workbench for Highly Dynamic Thermo-mechanical Analysis
Author | : Damien Andre |
Publisher | : John Wiley & Sons |
Total Pages | : 212 |
Release | : 2015-10-26 |
Genre | : Technology & Engineering |
ISBN | : 1848217722 |
Complex behavior models (plasticity, cracks, visco elascticity) face some theoretical difficulties for the determination of the behavior law at the continuous scale. When homogenization fails to give the right behavior law, a solution is to simulate the material at a meso scale in order to simulate directly a set of discrete properties that are responsible of the macroscopic behavior. The discrete element model has been developed for granular material. The proposed set shows how this method is capable to solve the problem of complex behavior that are linked to discrete meso scale effects. The first book solves the local problem, the second one presents a coupling approach to link the structural effects to the local ones, this third book presents the software workbench that includes all the theoretical developments.