Download or read book Computer Simulation of Linear and Nonlinear Crack Propagation in Cementitious Materials written by Túlio Nogueir Bittencourt and published by . This book was released on 1993 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of computer graphics is stressed not only to control the crack propagation process, but also to allow fast and comprehensive interpretation of results.
Download or read book Modeling of Cyclic Crack Propagation in Concrete Using the Scaled Boundary Finite Element Method written by Omar Alrayes and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Fracture Mechanics written by Fazil Erdogan and published by ASTM International. This book was released on 1995 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Modelling of Concrete Structures written by Gunther Meschke and published by CRC Press. This book was released on 2006-03-16 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: This conference proceedings brings together the work of researchers and practising engineers concerned with computational modelling of complex concrete, reinforced concrete and prestressed concrete structures in engineering practice. The subjects considered include computational mechanics of concrete and other cementitious materials, including masonry. Advanced discretisation methods and microstructural aspects within multi-field and multi-scale settings are discussed, as well as modelling formulations and constitutive modelling frameworks and novel experimental programmes. The conference also considered the need for reliable, high-quality analysis and design of concrete structures in regard to safety-critical structures, with a view to adopting these in codes of practice or recommendations. The book is of special interest to researchers in computational mechanics, and industry experts in complex nonlinear simulations of concrete structures.
Download or read book Nonlinear Crack Models for Nonmetallic Materials written by Alberto Carpinteri and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume a survey of the most relevant nonlinear crack models is provided, with the purpose of analyzing the nonlinear mechanical effects occurring at the tip of macrocracks in quasi-brittle materials - such as concrete, rocks, ceramics, polymers, high-strength metallic alloys - and in brittle-matrix fibre-reinforced composites. Such local effects, as, for example, plastic deformation, yielding, strain-hardening, strain-softening, mechanical damage, matrix microcracking, aggregate debonding, fibre bridging, fibre slippage, crazing, and so on, are properly described through different simplified models, representing the peculiarities of the phenomena involved. The models are introduced and described separately and then compared in the last part of the book. This volume will be of interest to students, professionals and researchers in the field of nonlinear fracture mechanics.
Download or read book New Materials and Advanced Materials written by Zheng Yi Jiang and published by Trans Tech Publications Ltd. This book was released on 2010-10-27 with total page 1994 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). These 379 peer-reviewed papers, presented in a two-volume set, cover the latest advances in nanocrystalline materials, thin films and chemical vapor deposition, biocomposites, ceramics technology, MEMS, coatings, nanopowders, fuel cells, etc.; together with their practical application.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1994 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book English for Academic Purposes written by Giuliana Diani and published by Cambridge Scholars Publishing. This book was released on 2015-10-05 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis of academic genres and the use of corpus resources, methods and analytical tools are now central to a great deal of research into English for Academic Purposes (EAP). Both genre analysis and corpus investigations have revealed the patterning of academic texts, at the levels of lexicogrammar and discourse, and have led to richer understandings of the variations in such patterning between genres and between disciplines. The thirteen contributions included in this volume address issues in academic discourse studies from a range of perspectives: namely, corpus-based research into EAP at the lexicogrammatical and genre levels (Section 1); intercultural EAP research (Section 2); English as a Lingua Franca in academic communication (Section 3); and the relationships between corpus, genre and pedagogy in EAP, with an emphasis on implications and applications (Section 4). The collection is aimed primarily at teachers, students and researchers of EAP and applied corpus linguistics, but will also interest applied linguists in general. The emphasis of the contributions varies from studies with predominantly linguistic orientations to those focussing on practical applications.
Download or read book Introduction To Practical Peridynamics Computational Solid Mechanics Without Stress And Strain written by Walter Herbert Gerstle and published by World Scientific Publishing Company. This book was released on 2015-07-23 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: Parting with the classical continuum concepts of stress and strain in the computational simulation of solids, this book proposes a peridynamic model that applies the model directly to particle lattices. The model is directly solvable on a computer.Introduction to Practical Peridynamics is both a graduate-level textbook and a treatise. The text provides the necessary foundations to understand and apply the state-based peridynamic lattice model, as well as a guide for the practical use of the model — for solving realistic structural engineering problems (particularly in reinforced concrete structures) in elasticity, plasticity, damage, fracture, and large deformations.Contents in this book include introductory chapters presenting the historical background of the subject; classical elasticity; computational solid modeling; continuum mechanics; fracture mechanics; particle dynamics simulations on parallel computers; as well as example simulations (with model applications).
Download or read book Computational Modelling of Concrete Structures written by Günther Meschke and published by CRC Press. This book was released on 2018-01-31 with total page 1735 pages. Available in PDF, EPUB and Kindle. Book excerpt: The EURO-C conference series (Split 1984, Zell am See 1990, Innsbruck 1994, Badgastein 1998, St. Johann im Pongau 2003, Mayrhofen 2006, Schladming 2010, St. Anton am Arlberg 2014, and Bad Hofgastein 2018) brings together researchers and practising engineers concerned with theoretical, algorithmic and validation aspects associated with computational simulations of concrete and concrete structures. Computational Modelling of Concrete Structures reviews and discusses research advancements and the applicability and robustness of methods and models for reliable analysis of complex concrete, reinforced concrete and pre-stressed concrete structures in engineering practice. The contributions cover both computational mechanics and computational modelling aspects of the analysis and design of concrete and concrete structures: Multi-scale cement and concrete research: experiments and modelling Aging concrete: from very early ages to decades-long durability Advances in material modelling of plain concrete Analysis of reinforced concrete structures Steel-concrete interaction, fibre-reinforced concrete, and masonry Dynamic behaviour: from seismic retrofit to impact simulation Computational Modelling of Concrete Structures is of special interest to academics and researchers in computational concrete mechanics, as well as industry experts in complex nonlinear simulations of concrete structures.
Download or read book Fracture of Brittle Disordered Materials Concrete Rock and Ceramics written by G. Baker and published by CRC Press. This book was released on 2004-01-14 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book derives from the invited IUTAM Symposium in September 1993. The contributions discuss recent advances in fracture mechanics studies of concrete, rock, ceramics and other brittle disordered materials at micro and structural levels. It draws together research and new applications in continuum, damage and fracture mechanics approaches.
Download or read book Fiber Reinforced Cement Composites written by Fadhel Aouadi and published by . This book was released on 1992 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Modelling of Concrete Structures written by Nenad Bicanic and published by CRC Press. This book was released on 2010-02-24 with total page 1734 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1984 the EURO-C conference series (Split 1984, Zell am See 1990, Innsbruck 1994, Badgastein 1998, St Johann im Pongau 2003, Mayrhofen 2006, Schladming 2010) has provided a forum for academic discussion of the latest theoretical, algorithmic and modelling developments associated with computational simulations of concrete and concrete structure
Download or read book Crack Propagation in Linear and Nonlinear Visoelastic Material written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of this project is tile formulation and analysis of canonical boundary value problems modeling dynamic fracture in elastic and viscoelastic material. The selection of specific problems is guided by a number of goals. (1) One goal is to understand and model a number of surprising experimentally observed features of dynamic crack propagation in brittle polymers that are not predicted by classical linear elastic fracture mechanics. (2) Another goal is to solve dynamic fracture boundary value problems incorporating a crack tip cohesive zone whose constitutive law is derived from micromechanical models of the physical processes occurring at the tip of a growing crack in a brittle polymer. (3) A third goal is to develop combined analytical and numerical solution schemes for the above canonical dynamic fracture boundary value problems which can be used to benchmark and test direct numerical methods for solving such problems.
Download or read book Studies of Crack Propagation written by Sunil Nathur Gulrajani and published by . This book was released on 1994 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental computational Evaluation of the Accuracy of Fracture Toughness Tests on Concrete written by James Harvey Hanson and published by . This book was released on 2000 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computer Modelling of Concrete Structures written by Nenad Bićanić and published by . This book was released on 1994 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
