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Author: Hari Kishore Duvvuru Publisher: ISBN: Category : Crystals Languages : en Pages : 200
Book Description
The mechanical properties of engineering materials are directly controlled by the underlying microstructure, which in turn is governed by the processing methods. The complete description of microstructure is extremely complex and is also not required for many microstructure-properties relationships of interest. The relevant details of the microstructure that influence strongly the elastic-plastic properties of the material include the lattice orientation distribution (texture), the grain size and shape distribution, and the arrangement and distribution of dislocation networks on the various slip systems in the constituent crystals. Of these, the crystallographic texture is perhaps the most important aspect of microstructure that has a strong influence on the elastic and the initial yield properties of most polycrystalline materials used in the manufacture of engineering components. It should also be noted that crystallographic texture is likely to have the dominant effect on the inherent anisotropy exhibited by these materials.The objective of this thesis is to provide a mathematical framework for the development of material databases; capturing the relevant details of the microstructure, while paying attention to inherent anisotropy of properties associated with them. Here crystallographic texture is the only microstructural parameter that is considered. This work is motivated by a new design paradigm called microstructure sensitive design (MSD) which employs statistical description of microstructure and its core feature is the efficient spectral representations of microstructure-property-processing linkages. Using the MSD framework as the basis, novel computational methodologies were developed in this work to build material spectral databases in single phase cubic polycrystalline materials. These databases were critically evaluated in three different cases: 1) To predict the effective macroscale elastic properties in perfectly disordered copper polycrystals 2) Evolution of the microstructure and the concomitant anisotropic stress-strain response during deformation processes in FCC polycrystals and (3) in developing a processing recipe to obtain a targeted texture using selected processing techniques.
Author: Hari Kishore Duvvuru Publisher: ISBN: Category : Crystals Languages : en Pages : 200
Book Description
The mechanical properties of engineering materials are directly controlled by the underlying microstructure, which in turn is governed by the processing methods. The complete description of microstructure is extremely complex and is also not required for many microstructure-properties relationships of interest. The relevant details of the microstructure that influence strongly the elastic-plastic properties of the material include the lattice orientation distribution (texture), the grain size and shape distribution, and the arrangement and distribution of dislocation networks on the various slip systems in the constituent crystals. Of these, the crystallographic texture is perhaps the most important aspect of microstructure that has a strong influence on the elastic and the initial yield properties of most polycrystalline materials used in the manufacture of engineering components. It should also be noted that crystallographic texture is likely to have the dominant effect on the inherent anisotropy exhibited by these materials.The objective of this thesis is to provide a mathematical framework for the development of material databases; capturing the relevant details of the microstructure, while paying attention to inherent anisotropy of properties associated with them. Here crystallographic texture is the only microstructural parameter that is considered. This work is motivated by a new design paradigm called microstructure sensitive design (MSD) which employs statistical description of microstructure and its core feature is the efficient spectral representations of microstructure-property-processing linkages. Using the MSD framework as the basis, novel computational methodologies were developed in this work to build material spectral databases in single phase cubic polycrystalline materials. These databases were critically evaluated in three different cases: 1) To predict the effective macroscale elastic properties in perfectly disordered copper polycrystals 2) Evolution of the microstructure and the concomitant anisotropic stress-strain response during deformation processes in FCC polycrystals and (3) in developing a processing recipe to obtain a targeted texture using selected processing techniques.
Author: Dorel Banabic Publisher: Springer ISBN: 3319440705 Category : Technology & Engineering Languages : en Pages : 416
Book Description
This book gives a unified presentation of the research performed in the field of multiscale modelling in sheet metal forming over the course of more than thirty years by the members of six teams from internationally acclaimed universities. The first chapter is devoted to the presentation of some recent phenomenological yield criteria (BBC 2005 and BBC 2008) developed at the CERTETA center from the Technical University of Cluj-Napoca. An overview on the crystallographic texture and plastic anisotropy is presented in Chapter 2. Chapter 3 is dedicated to multiscale modelling of plastic anisotropy. The authors describe a new hierarchical multi-scale framework that allows taking into account the evolution of plastic anisotropy during sheet forming processes. Chapter 4 is focused on modelling the evolution of voids in porous metals with applications to forming limit curves and ductile fracture. The chapter details the steps needed for the development of dissipation functions and Gurson-type models for non-quadratic anisotropic plasticity criteria like BBC 2005 and those based on linear transformations. Chapter 5 describes advanced models for the prediction of forming limit curves developed by the authors. Chapter 6 is devoted to anisotropic damage in elasto-plastic materials with structural defects. Finally, Chapter 7 deals with modelling of the Portevin-Le Chatelier (PLC) effect. This volume contains contributions from leading researchers from the Technical University of Cluj-Napoca, Romania, the Catholic University of Leuven, Belgium, Clausthal University of Technology, Germany, Amirkabir University of Technology, Iran, the University of Bucharest, Romania, and the Institute of Mathematics of the Romanian Academy, Romania. It will prove useful to postgraduate students, researchers and engineers who are interested in the mechanical modeling and numerical simulation of sheet metal forming processes.
Author: A. D. Rollett Publisher: John Wiley & Sons ISBN: 0470444185 Category : Technology & Engineering Languages : en Pages : 850
Book Description
This volume contains papers presented at The 15th International Conference on the Texture of Materials from June 1-5th, 2008 in Pittsburgh, PA. Chapters include: Friction Stir Welding and Processing Texture and Anisotropy in Steels Effects of Magnetic Fields Hexagonal Metals Texture in Materials Design View information on Applications of Texture Analysis: Ceramic Transactions, Volume 201.
Author: Franz Roters Publisher: John Wiley & Sons ISBN: 3527642099 Category : Technology & Engineering Languages : en Pages : 188
Book Description
Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.
Author: Ning Ma Publisher: ISBN: Category : Crystal growth Languages : en Pages :
Book Description
Abstract: To accurately predict microstructure evolution and, hence, to synthesis metal and ceramic alloys with desirable properties involves many fundamental as well as practical issues. In the present study, novel theoretical and phase field approaches have been developed to address some of these issues including solute drag and segregation transition at grain boundaries and dislocations, grain growth in systems of anisotropic boundary properties, and precipitate microstructure development in polycrystalline materials. The segregation model has allowed for the prediction of a first-order segregation transition, which could be related to the sharp transition of solute concentration of grain boundary as a function of temperature. The incorporating of interfacial energy and mobility as functions of misorientation and inclination in the phase field model has allowed for the study of concurrent grain growth and texture evolution. The simulation results were analyzed using the concept of local grain boundary energy density, which simplified significantly the development of governing equations for texture controlled grain growth in Ti-6Al-4V. Quantitative phase field modeling techniques have been developed by incorporating thermodynamic and diffusivity databases. The models have been validated against DICTRA simulations in simple 1D problems and applied to simulate realistic microstructural evolutions in Ti-6Al-4V, including grain boundary a and globular a growth and sideplate development under both isothermal aging and continuous cooling conditions. The simulation predictions agree well with experimental observations.
Author: Dierk Raabe Publisher: John Wiley & Sons ISBN: 3527604219 Category : Technology & Engineering Languages : en Pages : 885
Book Description
This book fills a gap by presenting our current knowledge and understanding of continuum-based concepts behind computational methods used for microstructure and process simulation of engineering materials above the atomic scale. The volume provides an excellent overview on the different methods, comparing the different methods in terms of their respective particular weaknesses and advantages. This trains readers to identify appropriate approaches to the new challenges that emerge every day in this exciting domain. Divided into three main parts, the first is a basic overview covering fundamental key methods in the field of continuum scale materials simulation. The second one then goes on to look at applications of these methods to the prediction of microstructures, dealing with explicit simulation examples, while the third part discusses example applications in the field of process simulation. By presenting a spectrum of different computational approaches to materials, the book aims to initiate the development of corresponding virtual laboratories in the industry in which these methods are exploited. As such, it addresses graduates and undergraduates, lecturers, materials scientists and engineers, physicists, biologists, chemists, mathematicians, and mechanical engineers.
Author: S. Bulent Biner Publisher: Springer ISBN: 3319411969 Category : Technology & Engineering Languages : en Pages : 411
Book Description
This textbook provides a fast-track pathway to numerical implementation of phase-field modeling—a relatively new paradigm that has become the method of choice for modeling and simulation of microstructure evolution in materials. It serves as a cookbook for the phase-field method by presenting a collection of codes that act as foundations and templates for developing other models with more complexity. Programming Phase-Field Modeling uses the Matlab/Octave programming package, simpler and more compact than other high-level programming languages, providing ease of use to the widest audience. Particular attention is devoted to the computational efficiency and clarity during development of the codes, which allows the reader to easily make the connection between the mathematical formulism and the numerical implementation of phase-field models. The background materials provided in each case study also provide a forum for undergraduate level modeling-simulations courses as part of their curriculum.
Author: Hari Kishore Duvvuru
Author: Hari Kishore Duvvuru
Author: Marko Knezevic
Author: 
Author: Dorel Banabic
Author: A. D. Rollett
Author: Franz Roters
Author: Ning Ma
Author: Norbert Huber
Author: Dierk Raabe
Author: S. Bulent Biner