Finite Element Modeling Of Discrete Crack Propagation
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Finite Element Modeling Of Discrete Crack Propagation
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Author : Ming Xie
language : en
Publisher:
Release Date : 1995
Finite Element Modeling Of Discrete Crack Propagation written by Ming Xie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Concrete categories.
Extended Finite Element Method
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Author : Amir R. Khoei
language : en
Publisher: John Wiley & Sons
Release Date : 2015-02-23
Extended Finite Element Method written by Amir R. Khoei and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-02-23 with Science categories.
Introduces the theory and applications of the extended finite element method (XFEM) in the linear and nonlinear problems of continua, structures and geomechanics Explores the concept of partition of unity, various enrichment functions, and fundamentals of XFEM formulation. Covers numerous applications of XFEM including fracture mechanics, large deformation, plasticity, multiphase flow, hydraulic fracturing and contact problems Accompanied by a website hosting source code and examples
Extended Finite Element Method For Crack Propagation
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Author : Sylvie Pommier
language : en
Publisher: John Wiley & Sons
Release Date : 2013-03-04
Extended Finite Element Method For Crack Propagation written by Sylvie Pommier and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-04 with Technology & Engineering categories.
Novel techniques for modeling 3D cracks and their evolution in solids are presented. Cracks are modeled in terms of signed distance functions (level sets). Stress, strain and displacement field are determined using the extended finite elements method (X-FEM). Non-linear constitutive behavior for the crack tip region are developed within this framework to account for non-linear effect in crack propagation. Applications for static or dynamics case are provided.
Extended Finite Element Method
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Author : Soheil Mohammadi
language : en
Publisher: John Wiley & Sons
Release Date : 2008-04-30
Extended Finite Element Method written by Soheil Mohammadi and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-30 with Technology & Engineering categories.
This important textbook provides an introduction to the concepts of the newly developed extended finite element method (XFEM) for fracture analysis of structures, as well as for other related engineering applications. One of the main advantages of the method is that it avoids any need for remeshing or geometric crack modelling in numerical simulation, while generating discontinuous fields along a crack and around its tip. The second major advantage of the method is that by a small increase in number of degrees of freedom, far more accurate solutions can be obtained. The method has recently been extended to nonlinear materials and other disciplines such as modelling contact and interface, simulation of inclusions and holes, moving and changing phase problems, and even to multiscale analyses. The book is self contained, with summaries of both classical and modern computational techniques. The main chapters include a comprehensive range of numerical examples describing various features of XFEM.
Fracture Mechanics Of Concrete Structural Application And Numerical Calculation
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Author : George C. Sih
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Fracture Mechanics Of Concrete Structural Application And Numerical Calculation written by George C. Sih and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Concrete has traditionally been known as a material used widely in the construction of roads, bridges and buildings. Since cost effectiveness has always been one of the more important aspects of design, concrete, when reinforced and/or prestressed, is finding more use in other areas of application such as floating marine structures, storage tanks, nuclear vessel containments and a host of other structures. Because of the demand for concrete to operate under different loading and environmen tal conditions, increasing attention has been paid to study concrete specimens and structure behavior. A subject of major concern is how the localized segregation of the constituents in concrete would affect its global behavior. The degree of nonhomogeneity due to material property and damage. by yielding and/or cracking depends on the size scale and loading rate under consideration. Segregation or clustering of aggregates at the macroscopic level will affect specimen behavior to a larger degree than it would to a large structure such as a dam. Hence, a knowledge of concrete behavior over a wide range of scale is desired. The parameters governing micro-and macro-cracking and the techniques for evaluating and observing the damage in concrete need to be better understood. This volume is intended to be an attempt in this direction. The application of Linear Elastic Fracture Mechanics to concrete is discussed in several of the chapters.
Discrete Modeling Of Crack Propagation
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Author : Paul Andrew Wawrzynek
language : en
Publisher:
Release Date : 1991
Discrete Modeling Of Crack Propagation written by Paul Andrew Wawrzynek and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Fracture mechanics categories.
Modeling Of Cyclic Crack Propagation In Concrete Using The Scaled Boundary Finite Element Method
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Author : Omar Alrayes
language : en
Publisher:
Release Date : 2023
Modeling Of Cyclic Crack Propagation In Concrete Using The Scaled Boundary Finite Element Method written by Omar Alrayes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Many concrete structures, such as bridges and wind turbine towers, fail mostly due to fatigue following cyclic loading where the cracks are initiated and propagate under cyclic loading. Therefore, a detailed analysis of the fatigue behaviour and the associated crack propagation is required for the economical and reliable design of concrete structures. Damage due to fatigue can be divided into different categories dependent on the loading conditions as well as other environmental conditions. These types of fatigue are high cyclic fatigue loading with more than 1000 load cycles. The type of low cyclic fatigue has less than 1000 cycles. The very low cyclic loading for a specific number of cycles (i.e. 10 cycles). The application of the vehicles load vibration is classified under high cyclic fatigue caused by small elastic strains under high number of load cycles. The earthquake loading is classified under the low cycle fatigue type. Also, the corrosion fatigue failure in reinforcement concrete structure occurs under moisture cyclic loading. Different combinations of the above fatigue types can occur. The deterioration process is related to the type of load frequency which results in loss of material stiffness. This work's focus is developing a new approach that predicts crack growth and damage accumulation within the cohesive response of very low cyclic crack propagation in concrete members. The advanced studies on cyclic crack propagation for concrete are primarily empirical, where a large number of data samples from experiments are used for fitting the numerical simulation. Many approaches as Paris law used to predict fatigue life and crack growth rate. However, it has been shown that such phenomenological law loses much of its prediction ability for numerical implementation since the crack grow very slowly and cyclic damage zone is not detected for large part of concrete life. In the numerical approximation framework in literature, the Cohesive Zone Model (CZM) has been implemented to simulate the material damage and crack propagation under monotonic loading. Concerning cyclic loading scenarios, however, the prediction of crack propagation is still limited mainly by the analysis method mentioned. For concrete material, the damage models whose localization is governed numerically by finite element simulation, are aimed to simulate the propagation of fracture in cohesive process zone under monotonic loading. However, these types of models are used to determine the damage only along the loading/unloading paths. Several modelling approaches in finite element (FEM) for crack propagation under cyclic and fatigue loading are well documented in the literature. The CZM has been implemented in classical fracture mechanics to reduce the mesh quality required for crack simulation. Many models in the literature are dedicated to simulating the quasi-brittle behaviour, including a set of constitutive equations for monotonic, fatigue and hysterical material response. Furthermore, several calculation schemes are also done to predict tensile, flexural monotonic, and fatigue material behaviour. However, a damage accumulation process for concrete energy dissipation under random cycles is required. One of the most important implementations of the SBFEM approach is to model crack nucleation, and propagation under general loading conditions. The cohesive fracture and stress field can be determined using interface elements with zero-thickness, which were inserted directly into the SBFEM for only monotonic loading. Furthermore, the cohesive traction forces close to the crack tip are accurately computed as it is defined analytically. This enables to predict the crack path and to obtain the correct load-deflection response for different load scenarios. In the present work, a novel crack cyclic damage model has been developed within the SBFEM framework. The model considers the cumulative crack opening/sliding measure to dominate the damage mechanism at the subcritical loading levels. The aim of this approach is to establish a link between cyclic damage rate and the efficiency of the SBFEM in modelling crack propagation. Comparing the thermodynamic softening law of the constitutive model for fracture, several aspects have been provided, which incorporate the loading-unloading path, the damage evolution during the load cycle, and the crack traction displacement behaviour. This model is developed to simulate the discrete crack propagation in SBFEM for both single and mixed crack modes. It introduces a model for efficient simulation of cyclic behaviour. In the process of this work, a general derivation of the SBFEM method is given to simulate the crack propagation of the studied domain. The constitutive law is inserted into the SBFEM framework as interface element at crack tip. The nonlinear consistent interface model is solved using displacement control algorithm to obtain the load displacement for both monotonic and cyclic loading scenarios. The cyclic damage accumulation during loading and unloading is formulated within the constitutive concrete model. Two common problems of the three-point bending of a single-edge-notched concrete beam have been studied to validate the developed method. Also, two mixed-mode crack propagation examples are modelled for monotonic and cyclic loading, with results discussed and compared with available data in publications. The simulation results showed good agreement compared to experimental test measurements from the literature. The study provides a numerical procedure of fatigue crack growth in concrete which can help to identify the primary governing mechanism of fatigue crack propagation in concrete. The numerical investigations focused on the effect of the loading sequence on the fatigue material life. The developed method is validated using experimental results of several examples subjected to different loading conditions. The method also applies to offshore foundations, dams and slabs of airport taxiway calculations. This work can be used as a tool for fatigue material assessment within a non-linear finite element framework. The complexity of the calculation makes the application of the method quite expensive. However, further improvement in computer science will overcome this disadvantage.
Contact And Fracture Mechanics
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Author : Pranav H. Darji
language : en
Publisher: BoD – Books on Demand
Release Date : 2018-05-30
Contact And Fracture Mechanics written by Pranav H. Darji and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-30 with Science categories.
This book contains two sections: Chapters 1-7 deal with contact mechanics, and Chapters 8-13 deal with fracture mechanics. The different contributions of this book will cover the various advanced topics of research. It provides some needed background with respect to contact mechanics, fracture mechanics and the use of finite element methods in both. All the covered chapters of this book are of a theoretical and applied nature, suitable for the researchers of engineering, physics, applied mathematics and mechanics with an interest in computer simulation of contact and fracture problems.
Interactive Finite Element Analysis Of Fracture Processes
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Author : Paul Andrew Wawrzynek
language : en
Publisher:
Release Date : 1987
Interactive Finite Element Analysis Of Fracture Processes written by Paul Andrew Wawrzynek and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Finite element method categories.
The Combined Finite Discrete Element Method
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Author : Antonio A. Munjiza
language : en
Publisher: John Wiley & Sons
Release Date : 2004-04-21
The Combined Finite Discrete Element Method written by Antonio A. Munjiza and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-04-21 with Technology & Engineering categories.
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. Such problems include fragmentation using explosives (e.g rock blasting), impacts, demolition (collapsing buildings), blast loads, digging and loading processes, and powder technology. 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.g. in rock blasting applications a more or less intact rock mass is transformed into a pile of solid rock fragments of different sizes, which interact with each other). The topic is gaining in importance, and is at the forefront of some of the current efforts in computational modeling of the failure of solids. * Accompanying source codes plus input and output files available on the Internet * Important applications such as mining engineering, rock blasting and petroleum engineering * Includes practical examples of applications areas Essential reading for postgraduates, researchers and software engineers working in mechanical engineering.