Click download or read online button to get understanding the discrete element method book now. The combined finite discrete element method fdem can well model the transition from continuous to discontinuous behavior in rock mass. Introduction the discrete element method dem is the most attractive computational pt method used by researchers and engineers to successfully design, analyse and optimise bulk materials handling systems and equipment for. Only terms differing one order in t at maximum are combined. The combined finitediscrete element method pdf free. Following the work by munjiza and owen, the combined finitediscrete element method has been further developed to various irregular and deformable particles in many applications including pharmaceutical tableting, packaging and flow simulations, and impact analysis.
In order to overcome this defect, an improved fdem is developed in this work. The new method is termed the combined finitediscrete element method. Combined finitediscrete element method for simulation of hydraulic fracturing article pdf available in rock mechanics and rock engineering 494 september 2015 with 982 reads. The combined finite discrete element method can be an advantageous tool for modelling of masonry structures. Partial differential equations and the finite element method p. The combined finitediscrete element method fdem can well model the transition from continuous to discontinuous behavior in rock mass. The combined finitediscrete element method by antonio a. Numerical modeling of cracking of tunnel lining by combined. A comprehensive treatment of the combined finite elementdiscrete element method is contained in the book the combined finitediscrete element method by munjiza. The development of a novel approach for simulating granular material behaviour using the combined finitediscrete element method vcfemdem provides new insights into strain localization in granular materials. This chapter presents a general overview of the combined finitediscrete element method femdem which is considered as a stateoftheart technique for the. Combined finitediscrete element method for simulation of hydraulic fracturing article pdf available in rock mechanics and rock engineering 494 september 2015 with 975 reads. Pdf discontinua modeling techniques, such as discrete element method dem, discontinuum.
Summary a model for fracture and fragmentation of multilayered thin shells has been developed and implemented into the combined finitediscrete element code. Simulation of crack induced nonlinear elasticity using the combined. In this approach, all the particles are modelled within the framework of the dem. The mode i and mode ii failure models used are the rankine and tresca failure. The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and or dynamic behaviour of systems involving a large number of solid. A framework for grand scale parallelization of the combined finite discrete element method in 2d z lei, e rougier, ee knight, a munjiza computational particle mechanics 1 3, 307319, 2014. Modeling mixed mode fracture of concrete by using the. The combined finitediscrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage and failure processes in rock. The combined scaled boundary finitediscrete element method.
Zhang fang 1, 2, wang shupeng 2, zhang guofeng 2, 1, hu shaokai 2, feng jili 1, 2. Computational modeling of masonry structures using the. Introduction to the combined finitediscrete element method. This paper describes the application of the combined finitediscrete element method fdem for the simulation of two different rock slides observed at the alpetto mine in cesana brianza italy. Femdem modelling of hard body impact on the laminated glass. Fast finite element method implementation in native matlab. On the use of combined finitediscrete element method for impacted concrete structures. This paper aims to present a new numerical model for geometric nonlinear analysis of thinshell structures based on a combined finitediscrete element method fdem. The method combines aspects of both finite elements and discrete elements. This chapter presents a general overview of the combined finite discrete element method femdem which is considered as a stateof the art technique for the. Numerical simulation of hydraulic fracturing and associated microseismicity using. Following the work by munjiza and owen, the combined finite discrete element method has been further developed to various irregular and deformable particles in many applications including pharmaceutical tableting, packaging and flow simulations, and impact analysis.
The purpose of this paper is to present ygeo, a new numerical code for geomechanical applications based on the combined finitediscrete element method fdem. Pdf combined finitediscrete element method for simulation. Then, we develop a new combined finitediscrete element method numerical code. Abstract the efficiency of the discrete element method for studying the fracture of heterogeneous media has been demonstrated, but it is limited by the number of elements. Finite element method fem collection contains seventyfive selected books on finite element method. Furthermore, there is initially interspace between particles regardless of the particle arrangement. A study of brittle powder compaction using a combined. Mar 01, 2004 read the combined finitediscrete element method for structural failure and collapse, engineering fracture mechanics on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Read a combined finitediscrete element simulation of shot peening processes part i. The combined finitediscrete element method bridges the gap between finite and discrete element methods. Process modelling and simulation with finite element methods william b. Daudeville 3s laboratory, ujfinpgcnrs, grenoble, france abstract. The combined finitediscrete element method pdf free download.
The method is sometimes called molecular dynamics md, even when the particles are not molecules. Finite element method freeware for free downloads at winsite. Finite element method fem collection free ebooks download. Direct numerical simulation of sediment entrainment in. Modeling simultaneous multiple fracturing using the. Fdem inherits the advantages of fem in describing elastic deformations and the capabilities of dem in. Blast simulation in underground mines using the combined finitediscrete element method riyu weia, sheng zhanga,b, warna karunasenac, nagaratnam sivakugand, hongwu zhangb aadvanced computational modelling centre, university of queensland, st lucia, qld 4072, australia bdepartment of engineering mechanics, dalian university of technology, dalian. The finite element method is a computational technique for obtaining approximate solutions to the partial differential equations that arise in scientific and engineering applications. The combined finitediscrete element method ante munjiza.
Numerical modeling of cracking of tunnel lining by combined finite discrete element method. Blast simulation in underground mines using the combined. Mar 05, 2018 this paper aims to present a new numerical model for geometric nonlinear analysis of thinshell structures based on a combined finitediscrete element method fdem. Numerical modeling of cracking of tunnel lining by combined finitediscrete element method.
The purpose of this thesis is to simulate the macroscopic behaviour of an assembly of brittle particles, using the combined finite discrete element method. The purpose of this paper is to propose a novel combined finitediscrete element method fdem, based on the cohesive zone model, for simulating rockslide problems at the laboratory scale. An octave lua scripting language project dedicated to modeling electric motors inside the finite element method magnetics femm 2d simulation program. We have made the combined finitediscrete element method femdem the. The combined finite discrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage and failure processes in rock. Combined finitediscrete element method modeling of. The combined finitediscrete element method antonio a. The mixed mode iii fracture of concrete is investigated by using a fourpoint combined discrete and finite elements method. Several modifications of the well established finite element method have been performed to increase its robustness, always bearing in mind the permanent demands for calculation speed and the final quality of results. Computational modeling of masonry structures using the discrete element method explores the latest digital solutions for the analysis and modeling of brick, stone, concrete, granite, limestone, and glass block structures. A numerical investigation of mesh sensitivity for a new three. Focusing on critical research on mathematical and computational methods for masonry analysis, this publication is a pivotal. The combined finitediscrete element method fdem, which belongs to the discipline of computational mechanics of discontinua, is a newly developed numerical method aims at investigating failure, fracture and fragmentation in solids. Pdf recent developments in the combined finitediscrete.
The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and or dynamic. Unlike the finite element method, the discrete element method dem is the approach best suited for the analysis of discrete elements. Simulation of crack induced nonlinear elasticity using the combined finitediscrete element method. In order to investigate how laminated glass fractures under hard body impact and the subsequent fragmentation, the combined finite discrete element method femdem was employed in this paper. On the use of combined finitediscrete element method for. Modeling simultaneous multiple fracturing using the combined. Aug 01, 2000 read a combined finitediscrete element simulation of shot peening processes part i.
Fracture and fragmentation of thin shells using the combined finitediscrete element method. Introduction to the combined finite discrete element method. A coupling between the discrete element and the finite element methods is. The numerical modelling of masonry structures especially in the nonlinear range represents an. State key laboratory for geomechanics and deep underground engineering, beijing 83, china. Finitediscrete element models for assessment and repair of. Understanding the discrete element method download ebook. This series of talks will cover the latest research developments and new methods in multibody and frac ture simulations with finite element methods fem and. The combined finite discrete element method is a recently developed numerical method aiming at. A combined finitediscrete element algorithm for delamination.
Masonry is a heterogeneous structural material consisting of bricks joined by mortar layers. Pdf some aspects of combined finitediscrete element. Combined finitediscrete element method for simulation of. The ones marked may be different from the article in the profile. The combined finite discrete element method a natural extension of both discrete and finite element methods allows researchers to model problems involving the deformability of either one solid body, a large number of bodies, or a solid body which fragments e. The combined finitediscrete element method ante munjiza 10. The combined finite element discrete element method fdem is a hybrid computational method developed by that exploits the advantages of the finite element method fem e.
The composite action of distinct interacting bodies is simulated numerically by applying the combined discrete finite element method. Their combined citations are counted only for the first article. Thanks to the relatively inexpensive high performance hardware rapidly becoming available, it is possible to consider combined. A model for thin shells in the combined finitediscrete. Abaqus implementation of phase field a phasefield model for brittle fracture is implemented in the commercial finite element software ab. Discrete element method time integration 6 velocity verlet has the following attractive properties. In order to investigate how laminated glass fractures under hard body impact and the subsequent fragmentation, the combined finitediscrete element method femdem was employed in this paper. Coupled seepage and deformation analysis using the vcfem incorporating body forces allows accurate analysis of earth dams. Pdf combined finitediscrete element method for simulation of. This aim of this paper is to present the application of the combined finitediscrete element method fdem in structural mechanics. Fdem is an innovative numerical technique that combines the advantages of continuumbased modeling approaches and discrete element methods to overcome the inability of these methods to capture progressive damage and failure. Pmma representthelongitudinal impedanceofgraniteandpmma,respectively. We have made the combined finite discrete element method femdem the core of our solids technology. Numerical analysis of flyer plate experiments in granite via.
Numerical modeling of cracking of tunnel lining by. Each ply or a group of similar plies is modelled by one discrete element. In this study, a combined finitediscrete element algorithm is developed to solve delamination interaction between different layers of composites. Finite element modeling for stress analysis robert d. A framework for grand scale parallelization of the combined finite. The combined finitediscrete element method for structural. The applied methodology is a combination of the direct numerical simulation of turbulent flow, the combined finitediscrete element modeling of particle motion and collision, and the immersed boundary method for the fluidsolid interaction. This site is like a library, use search box in the widget to get ebook that you want. Sep 22, 2015 hydraulic fracturing is widely used in the exploitation of unconventional gas such as shale gas. Brittle behaviour is incorporated via the use of a mode i and mode ii brittle failure constitutive models. A combined finitediscrete element method is proposed for the prediction of reinforced. Numerical analysis of flyer plate experiments in granite. Mesh free methods moving beyond the finite element method g. The combined scaled boundary finitediscrete element.
Pdf hydraulic fracturing is widely used in the exploitation of unconventional. A comprehensive treatment of the combined finite element discrete element method is contained in the book the combined finite discrete element method by munjiza. The combined finitediscrete element method fdem merges the. Solid domains are discretized into finite elements in the usual way dictated by the finite element method. The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and or dynamic behaviour of systems involving a large number of solid deformable bodies. Structural applications of the combined finitediscrete. The virtual geoscience workbench for discontinuous systems is a computer software environment for modelling. The combined finitediscrete element method a natural extension of both discrete and finite element methods allows researchers to model problems involving the deformability of either one solid body, a large number of bodies, or a solid body which fragments e. The potential fracture zone is simulated by the discrete elements des and the other zone by the finite elements fes. The combined finitediscrete element method is a recently developed numerical method aimed at modelling failing, fracturing andor fragmenting solids. Rock slide simulation with the combined finitediscrete. Fdem combines the advantages of both the finite and the discrete elements and enables the simulation of initiation and. The combined finitediscrete element method semantic scholar.
The technique resulting from combining the sbfem and the dem is known as the scaled boundary finitediscrete element method sbfdem and is aimed at exploiting the advantages of both sbfem and dem with a particular focus on modelling particle breakage in granular materials. In the past, contact model in the combined finitediscrete element method fdem does not include the influence of the tangential contact interaction, and the deficient model associated with the contact force can seriously degrade the computing accuracy. On the use of combined finitediscrete element method for impacted concrete structures e. New combined finitediscrete element numerical code. Fdem is an innovative numerical technique, which has been intensively used in the past several decades in various engineering simulations. Traglast is a free finiteelementsolver also known as fem for finite element method for linear static 2d problem. Today the combined finitediscrete element method is gaining increasing importance in engineering programmes and is at the forefront of current efforts in computational modelling of the failure of solids. Rock slide simulation with the combined finitediscrete element method international journal of geomechanics vol 12, no 6. The combined finitediscrete element method applied to the. This method discretises a single discrete element in finite elements, giving a more accurate estimate of the contact forces and deformation of the elements.
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