Download or read book Crystallographic Texture Evolution and Elastic Anisotropy written by Thomas Böhlke and published by . This book was released on 2001 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Prediction of Crystallographic Texture Evolution and Anisotropic Stress strain Response During Large Plastic Deformation in Alpha titanium Alloys written by Xianping Wu and published by . This book was released on 2006 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new Taylor-type polycrystalline model has been developed to simulate the evolution of crystallographic texture and the anisotropic stress-strain response during large plastic deformation in [alpha]-titanium alloys at room temperature. Crystallographic slip, deformation twinning, and slip inside twinned regions were all considered as contributing mechanisms for the plastic strain in the model. This was accomplished by treating the dominant twin systems in a given crystal as independent grains once the total twin volume fraction in that crystal reached a predetermined saturation value. The newly formed grains were allowed to independently undergo further slip and the concomitant lattice rotation, but further twinning was prohibited. New descriptions have been established for slip and twin hardening and the complex coupling between them. Good predictions were obtained for the overall anisotropic stress-strain response and texture evolution in several different monotonic deformation paths on annealed, initially textured samples of two different chemical compositions of [alpha]-titanium alloys. The polycrystalline plasticity model presented here is built on the Taylor assumption of uniform deformation gradient in all of the constituent grains. The effects of this gross simplification have been evaluated by comparing the predicted stress and strain distributions between Taylor model and the more sophisticated finite element models that relax the assumption of the uniform strain. The anisotropy of the plastic behavior was observed to strongly influence the deviation of the Taylor model predictions from the finite element model predictions when comparing the stress and strain distributions in deformed polycrystalline [alpha]-titanium with initially random texture.The slip parameters established using the crystal plasticity model developed here were utilized in a novel spectral framework, called Microstructure Sensitive Design (MSD), for constructing elastic-plastic property closures in hexagonal polycrystals. The main focus was on the influence of the crystallographic texture (in the hcp polycrystals) on the components of the macroscale anisotropic elastic stiffness, macroscale anisotropic tensile yield, and the macroscale R-ratios (ratio of the transverse strains in tensile deformation mode) exhibited by the material.
Download or read book Texture and Anisotropy written by U. F. Kocks and published by Cambridge University Press. This book was released on 2000-08-15 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: A successful book covering an important area of materials science, now available in paperback.
Download or read book Plasticity and Textures written by W. Gambin and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: The classical, phenomenological theory of plastically anisotropic materials has passed a long way: from the work of von Mises presented in 1928, and the HilI formulation given in 1948, to the latest papers on large elastic-plastic deformations of anisotropic metal sheets. A characteristic feature of this approach is a linear flow rule and a quadratic yield criterion. Mathematical simplicity of the theory is a reason of its numerous applications to the analysis of engineering structures during the onset of plastic deformations. However, such an approach is not sufficient for description of the metal forming processes, when a metal element undergoes very large plastic strains. If we take an initially isotropic piece of metal, it becomes plastically anisotropic during the forming process, and the induced anisotropy progressively increases. This fact strongly determines directions of plastic flow, and it leads to an unexpected strain localization in sheet elements. To explain the above, it is necessary to take into account a polycrystalline structure of the metal, plastic slips on slip systems of grains, crystallographic lattice rotations, and at last, a formation of textures and their evolution during the whole deformation process. In short, it is necessary to introduce the plasticity of crystals and polycrystals. The polycrystal analysis shows that, when the advanced plastic strains take place, some privileged crystallographic directions, called a crystallographic texture, occur in the material. The texture formation and evolution are a primary reason for the induced plastic anisotropy in pure metals.
Download or read book Texture and Anisotropy of Polycrystals III written by Helmut Klein and published by Trans Tech Publications Ltd. This book was released on 2010-02-03 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The great majority of solid-state materials natural as well as man-made ones have a polycrystalline structure. They consist of crystallites having various sizes, shapes and crystallographic orientations. Because of the anisotropy of crystal properties, the material as a whole may also be anisotropic if the orientation distribution of the crystallites is not random. Furthermore, because of the differently oriented anisotropies of neighbouring crystals, the material is also micro-inhomogeneous. Macroscopic anisotropy and micro-inhomogeneity are thus fundamental properties of all polycrystalline materials. Therefore, the study of preferred crystal orientations, or crystallographic texture, is of major interest in research and industrial applications. Analysis of the crystal texture is now a well-established tool for quality control and failure analysis in industry, as well as in academic research, because of the ready availability of commercial equipment and refined computer programs.
Download or read book Crystal Plasticity Finite Element Methods written by Franz Roters and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book IUTAM Symposium on Computational Mechanics of Solid Materials at Large Strains written by Christian Miehe and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 487 pages. Available in PDF, EPUB and Kindle. Book excerpt: The steady increase in computational power induces an equally steady increase in the complexity of the engineering models and associated computer codes. This particularly affects the modeling of the mechanical response of materials. Material behavior is nowadays modeled in the strongly nonlinear range by tak ing into account finite strains, complex hysteresis effects, fracture phenomena and multiscale features. Progress in this field is of fundamental importance for many engineering disciplines, especially those concerned with material testing, safety, reliability and serviceability analyses of engineering structures. In recent years many important achievements have been made in the field of the theoretical formulation, the mathematical analysis and the numerical im plementation of deformation processes in solids. Computational methods and simulation techniques today play a central role in advancing the understanding of complex material behavior. Research in the field of "ComputationalMechan ics of Materials" is concerned with the development of mathematical models and numerical solution techniques for the simulation of material response. It is a very broad interdisciplinary field of science with inputs from traditional fields such as Applied Mechanics, Applied Mathematics, Materials Science, Solid State Physics and Information Technology. The intention of the IUTAM Symposium "Computational Mechanics of Solid Materials at Large Strains", held at the University of Stuttgart, Germany, from August 20-24, 200I, was to give a state of the art and a survey about recent developments in this field and to create perspectives for future research trends.
Download or read book Texture and Anisotropy of Polycrystals written by Flavio Deflorian and published by Trans Tech Publications Ltd. This book was released on 1998-02-16 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). Preferred crystal orientations and their statistical distribution the polycrystalline 'texture' are of major scientific interest and are of great importance in a wide range of industrial applications. The aim of this book is to monitor the rapid progress made in this field during the last few years. Texture analysis has expanded beyond its traditional domain of cubic metals and alloys to encompass virtually all crystalline, and even partially crystalline, materials - including natural as well as man-made ones such as geological samples, minerals, ceramics, polymers, composites, low-symmetry materials, thin films and layers. The main objectives are to obtain a better understanding and control of the properties of anisotropic materials (as related to bulk, grain or grain boundary structures), recrystallization and grain growth, deformation textures, and correlations between internal stress, composition and texture.
Download or read book Texture and Anisotropy of Polycrystals II written by Claude Esling and published by Trans Tech Publications Ltd. This book was released on 2005-07-15 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). Natural, as well as man-made, materials are often assumed to behave uniformly, exhibiting equal strength in all directions, because most of them have a polycrystalline structure. The anisotropy of the individual crystals, however, is smoothed out only in the presence of a large number of grains having a random distribution of orientations. In reality, there usually remains an anisotropy due to the existence of preferred orientations. Its magnitude depends upon the statistical distribution of grain orientations the "crystallographic texture" or, more simply, the texture. This governs the extremes, of the physical property of interest, which a single crystal of the material under consideration can exhibit in directional tests. Local variations in texture, as well as the arrangements and types of grain/phase boundaries, may give rise to inhomogeneous material properties. The texture also carries with it information on the history of a materials processing, use and misuse. A knowledge of the texture is a prerequisite for all quantitative techniques of materials characterization, and is based upon the interpretation of diffraction-peak intensities. It is also necessary to model the relationships between microstructural features and physical or mechanical properties. Therefore, the texture is of great value for quality control in a wide range of industrial applications, and in basic materials research.
Download or read book Homogenization and materials design of mechanical properties of textured materials based on zeroth first and second order bounds of linear behavior written by Lobos Fernández, Mauricio and published by KIT Scientific Publishing. This book was released on 2018-07-09 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Additive Manufacturing of Metals written by John O. Milewski and published by Springer. This book was released on 2017-06-28 with total page 351 pages. Available in PDF, EPUB and Kindle. Book excerpt: This engaging volume presents the exciting new technology of additive manufacturing (AM) of metal objects for a broad audience of academic and industry researchers, manufacturing professionals, undergraduate and graduate students, hobbyists, and artists. Innovative applications ranging from rocket nozzles to custom jewelry to medical implants illustrate a new world of freedom in design and fabrication, creating objects otherwise not possible by conventional means. The author describes the various methods and advanced metals used to create high value components, enabling readers to choose which process is best for them. Of particular interest is how harnessing the power of lasers, electron beams, and electric arcs, as directed by advanced computer models, robots, and 3D printing systems, can create otherwise unattainable objects. A timeline depicting the evolution of metalworking, accelerated by the computer and information age, ties AM metal technology to the rapid evolution of global technology trends. Charts, diagrams, and illustrations complement the text to describe the diverse set of technologies brought together in the AM processing of metal. Extensive listing of terms, definitions, and acronyms provides the reader with a quick reference guide to the language of AM metal processing. The book directs the reader to a wealth of internet sites providing further reading and resources, such as vendors and service providers, to jump start those interested in taking the first steps to establishing AM metal capability on whatever scale. The appendix provides hands-on example exercises for those ready to engage in experiential self-directed learning.
Download or read book Modeling of Creep for Structural Analysis written by Konstantin Naumenko and published by Springer Science & Business Media. This book was released on 2007-04-06 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book develops methods to simulate and analyze the time-dependent changes of stress and strain states in engineering structures up to the critical stage of creep rupture. The objective of this book is to review some of the classical and recently proposed approaches to the modeling of creep for structural analysis applications. It also aims to extend the collection of available solutions of creep problems by new, more sophisticated examples.
Download or read book Micromechanical Modeling and Simulation of Forming Processes written by Glavas, Vedran and published by KIT Scientific Publishing. This book was released on 2016-12-21 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: The deep drawing of an aluminum alloy used in the packaging industry for the beverage can manufacturing process is investigated. In this work, the effective constitutive behavior is based on a crystal plasticity model in combination with a non-linear Hashin-Shtrikman type homogenization scheme in which a reference stiffness controls the stress and strain fluctuations. The simulation results are compared to experiments in terms of deep drawing earing profiles, texture evolution, and localization.
Download or read book Microstructure and Texture in Steels written by Arunansu Haldar and published by Springer Science & Business Media. This book was released on 2009-09-03 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructure and Texture in Steels and Other Materials comprises a collection of articles pertaining to experimental and theoretical aspects of the evolution of crystallographic texture and microstructure during processing of steels and some other materials. Among the topics covered is the processing-microstructure-texture-property relationship in various kinds of steels, including the latest grade. Special emphasis has been given to introduce recent advances in the characterization of texture and microstructure, as well as modeling. The papers included are written by well-known experts from academia and industrial R and D, which will provide the reader with state-of-the-art, in-depth knowledge of the subject. With these attributes, Microstructure and Texture in Steels and Other Materials is expected to serve the cause of creating awareness of current developments in microstructural science and materials engineering among academic and R and D personnel working in the field.
Download or read book Applications of Texture Analysis written by A. D. Rollett and published by John Wiley & Sons. This book was released on 2008-12-05 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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: Thin Films Texture at Non-Ambient Conditions Novel Texture Measurement Techniques Including 3D Complex Oxides Interface Textures Recrystallization Texture Biomaterials Texture Effects on Damage Accumulation Digital Microstructures View information on Materials Processing and Texture: Ceramic Transactions, Volume 200.
Download or read book Microstructure generation and micromechanical modeling of sheet molding compound composites written by Görthofer, Johannes and published by KIT Scientific Publishing. This book was released on 2022-09-13 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wir präsentieren einen Algorithmus zur schnellen Erzeugung von SMC Mikrostrukturen hoher Güte, durch Verwendung einer exakten Schließung und eines quasi-zufälligen Samplings. Darüber hinaus stellen wir ein modulares Framework zur Modellierung anisotroper Schädigung vor. Unser Konzept der Extraktionstensoren und Schädigungsfunktionen ermöglicht die Beschreibung komplexer Vorgänge. Darüber hinaus schlagen wir einen ganzheitlichen Multiskalenansatz zur Bestimmung anisotroper Versagenskriterien vor. - We introduce an algorithm that allows for a fast generation of SMC composite microstructures. An exact closure approximation and a quasi-random orientation sampling ensure high fidelity. Furthermore, we present a modular framework for anisotropic damage evolution. Our concept of extraction tensors and damage-hardening functions enables the description of complex damage-degradation. In addition, we propose a holistic multiscale approach for constructing anisotropic failure criteria.
Download or read book Adaptive tolerant and efficient composite structures written by Martin Wiedemann and published by Springer Science & Business Media. This book was released on 2012-08-01 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite structures are most efficient in performance and production cost when combined with smart materials making them adaptable to changing operational conditions. The specific production processes of composites offer the possibility to integrate more functions thus making the structure more valuable. Active functions can be realized by smart materials, e.g. morphing, active vibration control, active structure acoustic control or structure health monitoring. The foundation is a sound understanding of materials, design methods, design principles, production technologies and adaptronics. Along the complete process chain this disciplines together deliver advanced lightweight solutions for applications ranging from mechanical engineering to vehicles, airframe and finally space structures. This book provides the scientific foundations as well as inspiring new ideas for engineers working in the field of composite lightweight structures.
