Multiscale Analysis of Void Coalescence in Ductile Metals

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (622 download)

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Book Synopsis Multiscale Analysis of Void Coalescence in Ductile Metals by : Matthew Kenneth Jones

Download or read book Multiscale Analysis of Void Coalescence in Ductile Metals written by Matthew Kenneth Jones and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A mulitscale approach is used to model the coalescence of voids. At the microscale, cylindrical and spherical voids in nickel and the magnesium alloy AM60 are simulated through finite element analyses. The nickel cylindrical void simulations are compared to a set of experiments to validate this micromechanical finite element approach used to study void coalescence. At the macroscale, the coalescence portion of a microstructure-property material model is modified to reflect the behavior of three-dimensional spherical voids using results from the micromechanical simulations. An analysis of an automotive component illustrates the influence of void coalescence at the structural scale.

Multiscale Analysis of Void Coalescence in Ductile Metals

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (654 download)

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Book Synopsis Multiscale Analysis of Void Coalescence in Ductile Metals by :

Download or read book Multiscale Analysis of Void Coalescence in Ductile Metals written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A mulitscale approach is used to model the coalescence of voids. At the microscale, cylindrical and spherical voids in nickel and the magnesium alloy AM60 are simulated through finite element analyses. The nickel cylindrical void simulations are compared to a set of experiments to validate this micromechanical finite element approach used to study void coalescence. At the macroscale, the coalescence portion of a microstructure-property material model is modified to reflect the behavior of three-dimensional spherical voids using results from the micromechanical simulations. An analysis of an automotive component illustrates the influence of void coalescence at the structural scale.

Void Coalescence Processes Quantified Through Atomistic and Multiscale Simulation

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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Void Coalescence Processes Quantified Through Atomistic and Multiscale Simulation by :

Download or read book Void Coalescence Processes Quantified Through Atomistic and Multiscale Simulation written by and published by . This book was released on 2007 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation of ductile fracture at the atomic scale reveals many aspects of the fracture process including specific mechanisms associated with void nucleation and growth as a precursor to fracture and the plastic deformation of the material surrounding the voids and cracks. Recently we have studied void coalescence in ductile metals using large-scale atomistic and continuum simulations. Here we review that work and present some related investigations. The atomistic simulations involve three-dimensional strain-controlled multi-million atom molecular dynamics simulations of copper. The correlated growth of two voids during the coalescence process leading to fracture is investigated, both in terms of its onset and the ensuing dynamical interactions. Void interactions are quantified through the rate of reduction of the distance between the voids, through the correlated directional growth of the voids, and through correlated shape evolution of the voids. The critical inter-void ligament distance marking the onset of coalescence is shown to be approximately one void radius based on the quantification measurements used, independent of the initial separation distance between the voids and the strain-rate of the expansion of the system. No pronounced shear flow is found in the coalescence process. We also discuss a technique for optimizing the calculation of fine-scale information on the fly for use in a coarse-scale simulation, and discuss the specific case of a fine-scale model that calculates void growth explicitly feeding into a coarse-scale mechanics model to study damage localization.

Void Coalescence Processes Quantified Through Atomistic and Multiscale Simulation

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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (316 download)

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Book Synopsis Void Coalescence Processes Quantified Through Atomistic and Multiscale Simulation by : R. E. Rudd

Download or read book Void Coalescence Processes Quantified Through Atomistic and Multiscale Simulation written by R. E. Rudd and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Simulation of ductile fracture at the atomic scale reveals many aspects of the fracture process including specific mechanisms associated with void nucleation and growth as a precursor to fracture and the plastic deformation of the material surrounding the voids and cracks. Recently we have studied void coalescence in ductile metals using large-scale atomistic and continuum simulations. Here we review that work and present some related investigations. The atomistic simulations involve three-dimensional strain-controlled multi-million atom molecular dynamics simulations of copper. The correlated growth of two voids during the coalescence process leading to fracture is investigated, both in terms of its onset and the ensuing dynamical interactions. Void interactions are quantified through the rate of reduction of the distance between the voids, through the correlated directional growth of the voids, and through correlated shape evolution of the voids. The critical inter-void ligament distance marking the onset of coalescence is shown to be approximately one void radius based on the quantification measurements used, independent of the initial separation distance between the voids and the strain-rate of the expansion of the system. No pronounced shear flow is found in the coalescence process.

Three-Dimensional Molecular Dynamics Simulations of Void Coalescence During Dynamic Fracture of Ductile Metals

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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (873 download)

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Book Synopsis Three-Dimensional Molecular Dynamics Simulations of Void Coalescence During Dynamic Fracture of Ductile Metals by :

Download or read book Three-Dimensional Molecular Dynamics Simulations of Void Coalescence During Dynamic Fracture of Ductile Metals written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Void coalescence and interaction in dynamic fracture of ductile metals have been investigated using three-dimensional strain-controlled multi-million atom molecular dynamics simulations of copper. The correlated growth of two voids during the coalescence process leading to fracture is investigated, both in terms of its onset and the ensuing dynamical interactions. Void interactions are quantified through the rate of reduction of the distance between the voids, through the correlated directional growth of the voids, and through correlated shape evolution of the voids. The critical inter-void ligament distance marking the onset of coalescence is shown to be approximately one void radius based on the quantification measurements used, independent of the initial separation distance between the voids and the strain-rate of the expansion of the system. The interaction of the voids is not reflected in the volumetric asymptotic growth rate of the voids, as demonstrated here. Finally, the practice of using a single void and periodic boundary conditions to study coalescence is examined critically and shown to produce results markedly different than the coalescence of a pair of isolated voids.

Void Growth and Coalescence in Dynamic Fracture from the Atomistic Level

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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (727 download)

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Book Synopsis Void Growth and Coalescence in Dynamic Fracture from the Atomistic Level by :

Download or read book Void Growth and Coalescence in Dynamic Fracture from the Atomistic Level written by and published by . This book was released on 2010 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: An important example of multiscale material response is the fracture of ductile solids. In the process of ductile fracture, voids nucleate, grow and coalesce, and it is this linking process that creates the fracture. Ductile fracture has typically been modeled at the continuum level, in a variety of models that may or may not model voids explicitly. Previously we have studied the plasticity associated with void growth in fcc metals, focusing on copper. In the work discussed here we examine void growth in single crystal and polycrystalline body-centered cubic (bcc) metals (V, Nb, Ta, Mo and W) subjected to tension at a high rate and high triaxiality. Large-scale atomistic models provide detailed information on void nucleation and growth and the plasticity generated as voids coalesce, based solely on the constitutive properties inherent in the interatomic forces. The details of the plasticity may be used to inform dislocation dynamics and continuum plasticity models in order to develop models that scale beyond the nanoscale. We also discuss concurrent multiscale modeling of void growth using Coarse-Grained Molecular Dynamics.

A Microstructure Based Multiscale Computational Framework for Metal Forming

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ISBN 13 :
Total Pages : 318 pages
Book Rating : 4.:/5 (111 download)

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Book Synopsis A Microstructure Based Multiscale Computational Framework for Metal Forming by : Umair Bin Asim

Download or read book A Microstructure Based Multiscale Computational Framework for Metal Forming written by Umair Bin Asim and published by . This book was released on 2019 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aerospace industry is relying on the lightweight and high-strength metallic alloys for a very long time. The two types of alloys that take the precedence are the aluminium and titanium alloys. The aluminium and titanium alloys which are used in the airframe applications, are ductile in nature and they are characterized by their ability to undergo considerable plastic deformation before failure because of which they can be formed into required shapes. The failure of such materials are of a cone-and-cup type and the fracture surface is wavy because of the mechanisms of void nucleation, growth and coalescence, signifying ductile failure. A rigorous representative volume element (RVE) based void growth study of voids of known porosity, size, shape and orientation was carried out in single crystals and bicrystals of aluminium and titanium alloys at different stress triaxialities using fully validated crystal plasticity finite element method. It has been reported that the voids tend to nucleate on the phase boundaries in the titanium alloys. The RVE study of void growth in hexagonal close-packed single crystal ??-phase and on the interface of the bicrystal of ?? and ?? (body centred cubic) phases were carried out in case of titanium alloys. The effects of the Burger orientation relation and phase boundary inclination on void growth were also investigated in the bicrystals. It was found that all these parameters govern the void growth. The results obtained from the RVE study were quantified and a model is proposed to predict the void growth depending on the equivalent strain, stress triaxiality and PBI in case of bicrystals. A constitutive model is developed, implemented and validated in a commercially available finite element analysis software which extends current crystal plasticity theory to account for the effects of void growth and coalescence in single and bicrystals.

Integrated Computational Materials Engineering (ICME) for Metals

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Publisher : John Wiley & Sons
ISBN 13 : 1118342658
Total Pages : 474 pages
Book Rating : 4.1/5 (183 download)

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Book Synopsis Integrated Computational Materials Engineering (ICME) for Metals by : Mark F. Horstemeyer

Download or read book Integrated Computational Materials Engineering (ICME) for Metals written by Mark F. Horstemeyer and published by John Wiley & Sons. This book was released on 2012-06-07 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: State-of-the-technology tools for designing, optimizing, and manufacturing new materials Integrated computational materials engineering (ICME) uses computational materials science tools within a holistic system in order to accelerate materials development, improve design optimization, and unify design and manufacturing. Increasingly, ICME is the preferred paradigm for design, development, and manufacturing of structural products. Written by one of the world's leading ICME experts, this text delivers a comprehensive, practical introduction to the field, guiding readers through multiscale materials processing modeling and simulation with easy-to-follow explanations and examples. Following an introductory chapter exploring the core concepts and the various disciplines that have contributed to the development of ICME, the text covers the following important topics with their associated length scale bridging methodologies: Macroscale continuum internal state variable plasticity and damage theory and multistage fatigue Mesoscale analysis: continuum theory methods with discrete features and methods Discrete dislocation dynamics simulations Atomistic modeling methods Electronics structures calculations Next, the author provides three chapters dedicated to detailed case studies, including "From Atoms to Autos: A Redesign of a Cadillac Control Arm," that show how the principles and methods of ICME work in practice. The final chapter examines the future of ICME, forecasting the development of new materials and engineering structures with the help of a cyberinfrastructure that has been recently established. Integrated Computational Materials Engineering (ICME) for Metals is recommended for both students and professionals in engineering and materials science, providing them with new state-of-the-technology tools for selecting, designing, optimizing, and manufacturing new materials. Instructors who adopt this text for coursework can take advantage of PowerPoint lecture notes, a questions and solutions manual, and tutorials to guide students through the models and codes discussed in the text.

Materials Science Reading Sampler

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Publisher : John Wiley & Sons
ISBN 13 : 111860590X
Total Pages : 340 pages
Book Rating : 4.1/5 (186 download)

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Book Synopsis Materials Science Reading Sampler by : Wiley

Download or read book Materials Science Reading Sampler written by Wiley and published by John Wiley & Sons. This book was released on 2013-02-15 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 2013 Materials Science eBook Sampler includes select material from seven Materials Science titles. Titles are from a number of Wiley imprints including Wiley, Wiley-VCH, Wiley-American Ceramic Society, Wiley-Scrivener and Wiley-The Minerals, Metals and Materials Society. The material that is included for each selection is the book’s full Table of Contents as well as a sample chapter. If you would like to read more from these books, you can purchase the full book or e-book at your favorite online retailer.

Multiscale Modelling in Sheet Metal Forming

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Publisher : Springer
ISBN 13 : 3319440705
Total Pages : 416 pages
Book Rating : 4.3/5 (194 download)

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Book Synopsis Multiscale Modelling in Sheet Metal Forming by : Dorel Banabic

Download or read book Multiscale Modelling in Sheet Metal Forming written by Dorel Banabic and published by Springer. This book was released on 2016-10-20 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Multiscale Analysis of Deformation and Failure of Materials

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Publisher : John Wiley & Sons
ISBN 13 : 111995648X
Total Pages : 510 pages
Book Rating : 4.1/5 (199 download)

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Book Synopsis Multiscale Analysis of Deformation and Failure of Materials by : Jinghong Fan

Download or read book Multiscale Analysis of Deformation and Failure of Materials written by Jinghong Fan and published by John Wiley & Sons. This book was released on 2011-06-28 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting cutting-edge research and development within multiscale modeling techniques and frameworks, Multiscale Analysis of Deformation and Failure of Materials systematically describes the background, principles and methods within this exciting new & interdisciplinary field. The author’s approach emphasizes the principles and methods of atomistic simulation and its transition to the nano and sub-micron scale of a continuum, which is technically important for nanotechnology and biotechnology. He also pays close attention to multiscale analysis across the micro/meso/macroscopy of a continuum, which has a broad scope of applications encompassing different disciplines and practices, and is an essential extension of mesomechanics. Of equal interest to engineers, scientists, academics and students, Multiscale Analysis of Deformation and Failure of Materials is a multidisciplinary text relevant to those working in the areas of materials science, solid and computational mechanics, bioengineering and biomaterials, and aerospace, automotive, civil, and environmental engineering. Provides a deep understanding of multiscale analysis and its implementation Shows in detail how multiscale models can be developed from practical problems and how to use the multiscale methods and software to carry out simulations Discusses two interlinked categories of multiscale analysis; analysis spanning from the atomistic to the micro-continuum scales, and analysis across the micro/meso/macro scale of continuum.

Multiscale Deformation and Fracture in Materials and Structures

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Publisher : Springer Science & Business Media
ISBN 13 : 0306469529
Total Pages : 451 pages
Book Rating : 4.3/5 (64 download)

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Book Synopsis Multiscale Deformation and Fracture in Materials and Structures by : T-J. Chuang

Download or read book Multiscale Deformation and Fracture in Materials and Structures written by T-J. Chuang and published by Springer Science & Business Media. This book was released on 2006-04-11 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern Solid Mechanics considers phenomena at many levels, ranging from nano size at atomic scale through the continuum level at millimeter size to large structures at the tens of meter scale. The deformation and fracture behavior at these various scales are inextricably related to interdisciplinary methods derived from applied mathematics, physics, chemistry, and engineering mechanics. This book, in honor of James R. Rice, contains articles from his colleagues and former students that bring these sophisticated methods to bear on a wide range of problems. Articles discussing problems of deformation include topics of dislocation mechanics, second particle effects, plastic yield criterion on porous materials, hydrogen embrittlement, solid state sintering, nanophases at surfaces, adhesion and contact mechanics, diffuse instability in geomaterials, and percolation in metal deformation. In the fracture area, the topics include: elastic-plastic crack growth, dynamic fracture, stress intensity and J-integral analysis, stress-corrosion cracking, and fracture in single crystal, piezoelectric, composite and cementitious materials. The book will be a valuable resource for researchers in modern solid mechanics and can be used as reference or supplementary text in mechanical and civil engineering, applied mechanics, materials science, and engineering graduate courses on fracture mechanics, elasticity, plasticity, mechanics of materials or the application of solid mechanics to processing, and reliability of life predictions.

Void initiation, growth, and coalescence in ductile fracture of metals

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ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.X/5 (4 download)

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Book Synopsis Void initiation, growth, and coalescence in ductile fracture of metals by : Heinz G. F. Wilsdorf

Download or read book Void initiation, growth, and coalescence in ductile fracture of metals written by Heinz G. F. Wilsdorf and published by . This book was released on 1976 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Practical Aspects of Computational Chemistry

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Publisher : Springer Science & Business Media
ISBN 13 : 9048126878
Total Pages : 468 pages
Book Rating : 4.0/5 (481 download)

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Book Synopsis Practical Aspects of Computational Chemistry by : Jerzy Leszczynski

Download or read book Practical Aspects of Computational Chemistry written by Jerzy Leszczynski and published by Springer Science & Business Media. This book was released on 2009-10-03 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Practical Aspects of Computational Chemistry" presents contributions on a range of aspects of Computational Chemistry applied to a variety of research fields. The chapters focus on recent theoretical developments which have been used to investigate structures and properties of large systems with minimal computational resources. Studies include those in the gas phase, various solvents, various aspects of computational multiscale modeling, Monte Carlo simulations, chirality, the multiple minima problem for protein folding, the nature of binding in different species and dihydrogen bonds, carbon nanotubes and hydrogen storage, adsorption and decomposition of organophosphorus compounds, X-ray crystallography, proton transfer, structure-activity relationships, a description of the REACH programs of the European Union for chemical regulatory purposes, reactions of nucleic acid bases with endogenous and exogenous reactive oxygen species and different aspects of nucleic acid bases, base pairs and base tetrads.

Deformation Mode of Void-Growth and Coalescence in the Process of Ductile Fracture

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ISBN 13 :
Total Pages : 82 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Deformation Mode of Void-Growth and Coalescence in the Process of Ductile Fracture by : S. I. Oh

Download or read book Deformation Mode of Void-Growth and Coalescence in the Process of Ductile Fracture written by S. I. Oh and published by . This book was released on 1975 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation was to develop a fracture criterion applicable to the prediction of the occurrence of cracks in metal-working processes. A model for large void growth was proposed, and the deformation mode was calculated by the elastic-plastic finite-element method. The results of the calculation showed the formation of a shear band between large voids. The proposed fracture criterion is that the growth and coalescence of small voids along this shear band is the final process of fracturing. The fracture strain was estimated for a material by applying the McClintock analysis to small void coalescences. The proposed model offers an explanation for some important aspects of experimental observations of ductile fracture.

Multiscale Modeling of Complex Materials

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Publisher : Springer
ISBN 13 : 3709118123
Total Pages : 285 pages
Book Rating : 4.7/5 (91 download)

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Book Synopsis Multiscale Modeling of Complex Materials by : Tomasz Sadowski

Download or read book Multiscale Modeling of Complex Materials written by Tomasz Sadowski and published by Springer. This book was released on 2014-10-14 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers in this volume deal with materials science, theoretical mechanics and experimental and computational techniques at multiple scales, providing a sound base and a framework for many applications which are hitherto treated in a phenomenological sense. The basic principles are formulated of multiscale modeling strategies towards modern complex multiphase materials subjected to various types of mechanical, thermal loadings and environmental effects. The focus is on problems where mechanics is highly coupled with other concurrent physical phenomena. Attention is also focused on the historical origins of multiscale modeling and foundations of continuum mechanics currently adopted to model non-classical continua with substructure, for which internal length scales play a crucial role.

Journal of Engineering Materials and Technology

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ISBN 13 :
Total Pages : 544 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Journal of Engineering Materials and Technology by :

Download or read book Journal of Engineering Materials and Technology written by and published by . This book was released on 2007 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: