Complementary hydromechanical coupled finitediscrete. The combined finitediscrete element method books pics. Thanks to the relatively inexpensive high performance hardware rapidly becoming available, it is possible to consider combined. The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and or dynamic. The combined finitediscrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage. The proposed model 25 considers the effects of the behaviour of dry stone masonry structures strengthened with steel clamps and bolts 3 as well as masonry infill 4 and reinforced concrete elements 68 in confined masonry structures due to dynamic action. The prediction of blastinduced ground vibration and rock fragmentation at the mcgill utility replacement tunnel was investigated using two techniques. 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. Finitediscrete element models for assessment and repair of. Introduction to the combined finite discrete element method. We compute the effective uniaxial tensile strength of an ice sheet for several different specimen sizes.
Y2d is a robust twodimensional femdem research code developed by munjiza in 2004. Space decomposition based parallelization solutions for. A combined finitediscrete element method is proposed for the prediction of reinforced concrete structure response under severe dynamic loads as impacts due to natural or anthropic hazards. 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. Pdf combined finitediscrete element method for simulation. Recent developments in the combined finitediscrete element. Shot peening simulation using discrete and finite element.
The purpose of this paper is to propose a novel combined finite discrete element method fdem, based on the cohesive zone model czm, for simulating rock failure problems. A framework for grand scale parallelization of the combined. The phasefield method considerably reduces the implementation complexity for fracture problems as it removes the need for numerical tracking of discontinuities in the displacement field that are characteristic of discrete crack methods. 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. The combined finite discrete element method is a relatively new. A statistical analysis of ten scaleddistance empirical formulae was performed by. The applied methodology is a combination of three technologies, i.
Viennafem is built on top of the following libraries. Introduction to the combined finitediscrete element method. Rearrange individual pages or entire files in the desired order. The development of a novel approach for simulating granular material behaviour using the combined finite discrete element method vcfemdem provides new insights into strain localization in granular materials. On the use of combined finitediscrete element method for.
Applications of finitediscrete element modeling to rock. Understanding this complex behaviour has been the focus of a significant amount of research. In a finitediscrete element analysis the main issues which require consideration, for both dynamic and quasistatic. Each method has its own advantages and limitations. Numerical modelling of a discontinuous medium has gained much popularity in recent decades.
The combined finitediscrete element method femdem has been used to simulate processes of brittle fracturing and associated seismicity. Fdem combines finite element based analysis of continua with discrete element based. The combined finitediscrete element method applied to the study of rock fracturing behavior in 3d. The numerical modelling of masonry structures especially in the nonlinear range. In both of these methods, rubble is modelled as a discontinuum. The combined finite discrete element method femdem is ideally suited to the simulation of both the multibody pellet dynamic packing and quasistatic interactions as well as the stress eld of each individual pellet, its deformations and fragmentation. This work introduces the finite particle method fpm 2 to solve this problem. The combined finitediscrete element method femdem is ideally suited to the simulation of both the multibody pellet dynamic packing and quasistatic interactions as well as the stress eld of each individual pellet, its deformations and fragmentation.
The combined finite discrete element method femdem has been used to simulate processes of brittle fracturing and associated seismicity. Pdf discontinua modeling techniques, such as discrete element method dem, discontinuum deformation analysis dda, combined. With the newly extended femdem algorithm, two topics involving rock mechanics and geophysics are investigated. Prediction of blastinduced ground vibration and rock.
The method combines aspects of both finite elements and discrete elements. We have made the combined finitediscrete element method femdem the core of our solids technology. In this work, the combined finitediscrete element method fdem was first employed. 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 fdem proposed by munjiza is an innovative numerical technique to capture progressive damage and failure processes in rock. Structural applications of the combined finitediscrete. Fdem couples dem and fem by generating a finite element mesh separately for each particle discrete element located within the computational domain. Here, we introduce a twodimensional implementation of the combined finite discrete element method fdem, which merges the finite element. The new method is termed the combined finitediscrete element method. The methods were developed during this work for the research on ice mechanics. The numerical modelling of masonry structures especially in the nonlinear range represents an. A bridging subdomain is used, the hamiltonian is chosen as a linear combination of discrete and continuum hamiltonians.
A phasefield model for brittle fracture is implemented in the commercial finite element software abaqus by means of uel subroutine. Space decomposition based parallelization solutions for the. Damage characterization during laboratory strength testing. Multiscale analysis using a coupled discretefinite. The combined finitediscrete element method femdem is a stateoftheart numerical modelling technique pioneered in the mid1990s. Simulating the behavior of laminated glass under impact. Therefore, in combined finitediscrete element simulations the number of. The proposed model 2,3 considers the effects of the behaviour of masonry structures due to dynamic action, crack initiation and. However, it cannot model the fracturing process of rock driven by hydraulic pressure. In the first topic, a velocityweakening law is implemented to investigate the. Multiscale analysis using a coupled discretefinite element model. Viennamath provides the symbolic math kernel, viennagrid with viennadata allows for a. A combined finitediscrete element analysis of dry stone masonry structures, engineering structures, 52, 89100 20.
The combined finitediscrete element method fdem, pioneered by munjiza 2004, has become a tool of. Application of finite discrete element method in dynamic analysis of. Numerical methods that will handle numerous interactions of particles will be useful to solve this problem. Pdf combined finitediscrete element method for simulation of. Sep 22, 2015 the combined finite discrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage and failure processes in rock. This book also provides support to postgraduate students, computer programmers, scientists and researchers who wish to increase their knowledge of the finite. A graphical user interface and preprocessor for the. Munjiza the combined finitediscrete element method antonio a. The purpose of this paper is to propose a novel combined finitediscrete element method fdem, based on the cohesive zone model czm, for simulating rock failure problems. Pdf modeling simultaneous multiple fracturing using the. The combined finite discrete element method applied to the study of rock fracturing behavior in 3d. The combined finite discrete element method is an excellent reference for mechanical and civil engineers working with and involved in developing finite discrete element programmes. The incorporation of deformation kinematics into the discrete element formulation has also led naturally to a combined finitediscrete element approach in which the problem is analysed by a combination of the two methods 5,14,16. Solid domains are discretized into finite elements in the usual way dictated by the finite element method.
The mechanical behaviour of anisotropic rocks in the laboratory has been recently studied with the combined fdem method by cai et al. The simulations use a numerical tool called the voronoi cell finite element method vcfem, which the present work extends to allow accurate analysis of the flow of fluid through a porous medium, deformation of a granular material under load and coupled analysis of these phenomena. Munjiza 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. Vgw launch workshop virtual geoscience workbench department of earth science and engineering, ic. Munjiza the combined finite discrete element method antonio a. Simulating the behavior of laminated glass under impact using. In this work, the application of the numerical model for dynamic analysis of masonry structures based on a finite discrete element method 1 is presented.
As such, it has become a tool of choice for problems involving fracturing, fragmenting and. Pdf recent developments in the combined finitediscrete. Combined finitediscrete element method modeling of rock. The combined scaled boundary finitediscrete element. 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. The combined finitediscrete element method by antonio a. We have made the combined finite discrete element method femdem the core of our solids technology. The combined finite discrete element method bridges the gap between finite and discrete element methods. 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 development and testing of this numerical tool for use in. The pure continuum fem models rely on a combined coupled damage and tensile constitutive model e. Multiscale analysis using a coupled discretefinite element model 3 j i t i 2 where u i is the element centroid displacement in a fixed inertial coordinate frame x, i the angular velocity, m i the element mass, j i the moment of inertia, f i the resultant force, and t ithe resultant moment about the central axes. 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.
Discontinuity method ddm the geomechanical and flow models 15,16,17, the combined femdem discrete element method 18 technique plus the more recent extended finite element method xfem 4,19. 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. Thus, finite element based analysis of continua is combined with discrete element based transient dynamics, cd and contact interaction solutions. Coupled seepage and deformation analysis using the vcfem incorporating body forces allows accurate analysis of earth dams. Finitediscrete element models for assessment and repair. The virtual geoscience workbench for discontinuous systems is a computer software environment for modelling. Within the context of rock mechanics, the combined finitediscrete element method fdem has been applied to many complex industrial problems such as block caving, deep mining techniques tunneling, pillar strength, etc.
Comparison of different polyhedral dem models based on the. The rock mass is represented as a collection of elastic bulk elements glued by. Housner, the behavior of inverted pendulum structures during earthquakes, bulletin of the seismological society of. International journal of rock mechanics and mining sciences, 70. Multiscale analysis using a coupled discretefinite element model 3 j i t i 2 where u i is the element centroid displacement in a fixed inertial coordinate frame x, i the angular velocity, m i the element mass, j i the moment of inertia, f i the resultant force, and t i the resultant moment about the central axes. This book also provides support to postgraduate students, computer programmers, scientists and researchers who wish to increase their knowledge of the finitediscrete element method.
Thus, the study of hydraulic fracturing is of particular importance for petroleum industry. Combined finitediscrete element method for simulation of. Source codes and examples of input and output files, made available on the internet to. These codes allow not only particle flows to be simulated for moving particles the dem part but they also allow detailed stress calculations to be undertaken on any complex particle shapes and complex structures such as packed beds by meshing the. Validation of a threedimensional finitediscrete element method using experimental results of the split hopkinson pressure bar test. The combined finitediscrete element method for structural. Application of finite discrete element method in dynamic. The various branches of the dem family are the distinct element method proposed by peter a. 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 combined finitediscrete element method download. Numerical studies of frictional sliding behavior and. The combined finite discrete element method femdem is a stateof the art numerical modelling technique pioneered in the mid1990s. The rock mass is represented as a collection of elastic bulk elements glued by cohesive elements with zero thickness.
New combined finitediscrete element numerical code. Modeling simultaneous multiple fracturing using the combined finitediscrete element method article pdf available in geofluids 201845. Numerical simulation of particle stress and fracture using. Hydraulic fracturing is widely used in the exploitation of unconventional gas such as shale gas. Masonry is a heterogeneous structural material consisting of bricks joined by mortar layers. The combined finitediscrete element method is an excellent reference for mechanical and civil engineers working with and involved in developing finitediscrete element programmes. Direct numerical simulation of particle saltation in. Within the context of rock mechanics, the combined finite discrete element method fdem has been applied to many complex industrial problems such as block caving, deep mining techniques tunneling, pillar strength, etc. The combined finitediscrete element method bridges the gap between finite and discrete element methods. The combined finitediscrete element method a natural extension of both discrete and finite element methods allows researchers to model problems involving the deformability of. Simulations of punch through experiments were performed using a three dimensional discrete element method and a two dimensional combined finite discrete element method. 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.
Rock failure process is a complex phenomenon that involves elastic and plastic deformation, microscopic cracking, macroscopic fracturing, and frictional slipping of fractures. The combined finitediscrete element method is a recently developed numerical method aimed at modelling failing, fracturing andor fragmenting solids. It features a symbolic math kernel, which manipulates the strong or weak form of the problem and automatically derives the discrete form. Discrete element method dem is a method used in particle simulation and it was originally developed by cundall and strack. The combined finite discrete element method can be an advantageous tool for modelling of masonry structures. 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. A framework for grand scale parallelization of the. Combined finitediscrete element method for simulation of hydraulic fracturing article pdf available in rock mechanics and rock engineering 494 september 2015 with 1,007 reads.
This chapter presents a general overview of the combined finitediscrete element method femdem which is considered as a stateoftheart technique for the. Simulation of crack induced nonlinear elasticity using the combined. The purpose of this paper is to present ygeo, a new numerical code for geomechanical applications based on the combined finitediscrete element method fdem. Combined finitediscrete element method modeling of rockslides. Owena combined finitediscrete element simulation of shot peening processes part i study of 2d interaction laws eng comput, 17 5 2000, pp.
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