A combined finite discrete element simulation was performed to simulate the failure behaviour of the structure. A combined finitediscrete element analysis of dry stone. View enhanced pdf access article on wiley online library html view download pdf for offline viewing. The implementation of the combined finitediscrete element method 3234 utilized in this study is known as hoss hybrid optimization software suite has been specifically designed to bridge the gaps in fem and dem methods by directly. Fdem inherits the advantages of fem in describing elastic deformations and the capabilities of dem in.
The combined finitediscrete element method fdem in which multiple finite element bodies interact as distinct bodies is used to model a twodimensional fretting contact with and without coatings. Fdem is an innovative numerical technique, which has been intensively used in the past several decades in various engineering simulations. Modeling simultaneous multiple fracturing using the. The combined finite elementdiscrete element method fdem is a hybrid computational method developed by that exploits the advantages of the finite element method fem e. On the use of combined finitediscrete element method for impacted concrete structures. The numerical modelling of masonry structures especially in the nonlinear range represents an. 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. Gbm in fdem honours grain petrological properties and explicitly models grain boundaries. The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and or dynamic behaviour of systems. The particlescale formulation and twostage contact detection algorithm which has been. Understanding the discrete element method download ebook.
This aim of this paper is to present the application of the combined finitediscrete element method fdem in structural mechanics. A thesis submitted to the university of birmingham. The femdem was developed mainly for the simulation of fracturing problems considering deformable blocks that may split and separate during the analysis. A smooth contact algorithm for the combined finite. Combined finitediscrete element method modeling of. Combined finitediscrete element method is intended for the dynamic analysis of a large number of mutually interacting discrete elements, where. Although the combined finitediscrete element method fdem has proven itself in dealing with problems of complex shapes, fracture and fragmentation, there is a stark reality of cpu requirements when dealing with industrial scale problems. The two basic types of mechanical models are the classical models of continuum mechanics and the models of discrete elements. Simulation of crack induced nonlinear elasticity using the combined. 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.
This chapter presents a general overview of the combined finitediscrete element method femdem which is considered as a stateoftheart technique for the. 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. One of the approaches which combines the advantages of the finite and discrete element method is a combined finitediscrete element method femdem presented by munjiza. Deformability of discrete elements the combined finite. 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 finitediscrete element method pdf free. The new method is termed the combined finitediscrete element method.
Study on the effect of particle morphology on single. Alternative hardware architectures computational aspects of combined finite. Validation of a threedimensional finitediscrete element method using experimental results of the split hopkinson pressure bar test. Blast simulation in underground mines using the combined. The mixed mode iii fracture of concrete is investigated by using a fourpoint combined discrete and finite elements method. A numerical simulation was performed by klerck based on a combined finitediscrete element technique, as depicted in figure 1. The combined finitediscrete element method is a recently developed numerical method aimed at modelling failing, fracturing andor fragmenting solids.
This paper discusses the issues involved in the development of combined finitediscrete element methods. Discrete element method time integration 6 velocity verlet has the following attractive properties. The method combines aspects of both finite elements and discrete elements. Finitediscrete element models for assessment and repair. The combined finitediscrete element fdem has become a wellaccepted numerical technique to simulate the fracturing process of rocks under different loading conditions. Thanks to the relatively inexpensive high performance hardware rapidly becoming available, it is possible to consider combined. The finite element representation of the solid region is combined with progressive fracturing, which leads to the. From its inception, the combined finite discrete element method has used a distributed potential contact force algorithm to resolve interaction between finite elements. Investigation on the impact damage of glass using the. Combined finitediscrete element method for simulation of. The combined scaled boundary finitediscrete element. Structural applications of the combined finitediscrete element method.
Pdf nonlinear analysis of engineering structures by. The combined finitediscrete element method download. The combined finitediscrete element method by antonio a. Modeling mixed mode fracture of concrete by using the. 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. The incorporation of deformation kinematics into the discrete element formulation has also led naturally to a combined finite discrete element approach in which the problem is analysed by a combination of the two methods 5,14,16. However, it cannot model the fracturing process of rock driven by hydraulic pressure.
The pharmaceutical powder and tableting process is simulated using a combined finitediscrete element method and contact dynamics for irregularshaped particles. 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. The combined finitediscrete element method for structural. 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. Simulation of fracture coalescence in granite via the. Pdf some aspects of combined finitediscrete element. Munjiza the combined finitediscrete element method antonio a. The problem with existing algorithms is that the potential field introduces artificial numerical nonsmoothness in the contact force. Grain based modelling of rocks using the combined finite. Only terms differing one order in t at maximum are combined. Furthermore, there is initially interspace between particles regardless of the particle arrangement. Their combined citations are counted only for the first. Discrete element method time integration 5 velocity verlet integration the standard implementation scheme of this algorithm is. An experimental test was performed to assess the performance of the masonry bridge until the collapse of the structure, figure 1.
Simulation of crack induced nonlinear elasticity using the. The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and or dynamic. A coupling between the discrete element and the finite element methods is. Pdf combined finitediscrete element method for simulation of. Fortunately, a recently developed numerical method the combined finitediscrete element method fdem 3033, which merges finite elementbased analysis of continua with discrete elementbased transient dynamics, contact detection and contact interaction solutions of discontinua, provides a natural solution for such simulation. Cracking patterns similar to the test observations were predicted according to figure. Ct scanning of sand particles and an sh reconstruction of their 3d surface meshes, this study developed a combined finitediscrete element method for modeling the single particle breakage behaviors by incorporating real 3d particle morphologies of natural sands. Fretting wear modeling of coated and uncoated surfaces. Masonry is a heterogeneous structural material consisting of bricks joined by mortar layers. However, the study on threedimensional 3d fdem simulation of rock failure process is highly limited in comparison with that on twodimensional 2d fdem simulations, which is due to the high computational cost of. Unlimited viewing of the articlechapter pdf and any associated supplements and figures.
A typical combined finitediscrete element simulation comprises large number thousands or even millions of particles. Simulation of crack induced nonlinear elasticity using the combined finitediscrete element method. These simulations utilize an inhouse implementation of the combined finitediscrete element method fdem known. Thus, the study of hydraulic fracturing is of particular importance for petroleum industry. Modeling of stickslip behavior in sheared granular fault. Combined finitediscrete element method for simulation of hydraulic fracturing article pdf available in rock mechanics and rock engineering 494 september 2015 with 982 reads. Introduction to the combined finite discrete element method. In this paper, simulations are performed to model fracture coalescence processes in granite specimens with preexisting flaws. The combined finitediscrete element method semantic scholar.
This paper describes the implementation and advantages of grain based modelling gbm in the combined finitediscrete element method fdem to study the mechanical behaviour of crystalline rocks. The combined finitediscrete element method fdem can well model the transition from continuous to discontinuous behavior in rock mass. Introduction to the combined finitediscrete element method. In a finitediscrete element analysis the main issues which require consideration, for both dynamic and quasistatic. Gpgpuparallelized 3d combined finitediscrete element. A new approach for modeling fretting wear in a hertzian line contact is presented. 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. Numerical demonstration of finite rotation elasticity in the combined finite. The combined finitediscrete element method books pics. In this approach, all the particles are modelled within the framework of the dem.
Solid domains are discretized into finite elements in the usual way dictated by the finite element method. The pharmaceutical powder and tableting process is simulated using a combined finite. Hydraulic fracturing is widely used in the exploitation of unconventional gas such as shale gas. The potential fracture zone is simulated by the discrete elements des and the other zone by the finite elements fes. Pdf some aspects of combined finitediscrete element method. A combined finitediscrete element method for simulating pharmaceutical powder tableting.
Structural applications of the combined finitediscrete. 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. The rock mass is represented as a collection of elastic bulk elements glued by cohesive elements with zero thickness. 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. The ones marked may be different from the article in the profile. 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. 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. The combined finitediscrete element method fdem proposed by munjiza is an innovative numerical technique to capture progressive damage. A two span masonry bridge and the finite element model 14.
1267 419 1668 176 155 998 274 624 845 739 23 430 7 1670 732 177 977 1566 1079 300 1462 1055 333 1025 627 991 330 387 1321 1344 1628 848 606 1363 38 179 798 31 1499 1031 694 1107 1365 1486