Crystal Plasticity Modeling Of Polycrystalline Ti 6242 And Study Of Local Phenomena

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Crystal Plasticity Modeling of Polycrystalline Ti-6242 and Study of Local Phenomena

Author : Dhyanjyoti Deka
Publisher :
ISBN 13 :
Total Pages : 232 pages
Book Rating : 4.:/5 (678 download)

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Book Synopsis Crystal Plasticity Modeling of Polycrystalline Ti-6242 and Study of Local Phenomena by : Dhyanjyoti Deka

Download or read book Crystal Plasticity Modeling of Polycrystalline Ti-6242 and Study of Local Phenomena written by Dhyanjyoti Deka and published by . This book was released on 2005 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This work develops an experimentally validated computational model based on crystal plasticity for the analysis of two-phase [alpha]/[beta]Ti-6242 polycrystalline alloys. A rate dependent elasto-crystal plasticity model is incorporated in this model to accommodate anisotropy in material behavior and tension-compression asymmetry inherent to this alloy. A combination of detailed micro-testing, orientation imaging microscopy, computational simulations and minimization process involving Genetic algorithms (GA) is implemented in this study for careful characterization and calibration of the material parameters. Size effects are also considered in this analysis. A homogenized equivalent model of the transformed [beta] colonies is developed for incorporation in the Ti-6242 Finite Element (FE) model. The polycrystalline Ti-6242 computational model is constructed to incorporate accurate phase volume fractions as well as orientation distributions that are statistically equivalent to those observed in the OIM scans. The effects of accurate orientation, misorientation and micro-texture distributions are investigated through simulations using this computational model. The model is used to simulate constant strain rate and creep tests in compression and tension and the results are validated with experiments. The effects of microstructure and creep induced load-shedding on the localization of microstructural stresses and strains are studied for potential crack initiation criteria. Further, the microstructure has been studied at the point of failure in Ti-6242 in tension creep and dwell tests. Critical grains with the highest basal normal stress, stress in the loading direction and equivalent plastic strain are identified in the tension creep test and their specific crystallographic orientations and misorientations are studied. The critical grains in the case of dwell fatigue loading are also identified and a criterion for primary crack nucleation in Ti-6242 is developed.

Grain Size Dependent Crystal Plasticity Finite Element Model for Deformation and Creep Studies in Polycrystalline Ti-6242

Author : Gayathri Venkataramani
Publisher :
ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Grain Size Dependent Crystal Plasticity Finite Element Model for Deformation and Creep Studies in Polycrystalline Ti-6242 by : Gayathri Venkataramani

Download or read book Grain Size Dependent Crystal Plasticity Finite Element Model for Deformation and Creep Studies in Polycrystalline Ti-6242 written by Gayathri Venkataramani and published by . This book was released on 2007 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This thesis is aimed at identifying the critical microstructural parameters that cause local stress concentration due to load shedding between microstructural regions of varying strengths, proposed as one of the fundamental reasons for crack initiation in Ti-6242. A rate dependent, anisotropic, elasto-crystal plasticity based finite element model developed for polyphase Ti-6242 that can account for various microstructural features is used in the present study. A size effect model that relates hardness with the grain size, colony size and lath size in the microstructure of polycrystalline Ti-6242 is developed using different characteristic lengths for different slip systems in the primary fL and transformed 13 regions based on the slip direction. The initial slip system deformation resistances in the crystal plasticity relations are expressed as Hall-Petch type relations based on models of dislocation pileup for various deformation modes. The size-effect parameters are determined from single crystal and colony experiments. The model is validated by comparing the results of simulation with those from constant strain rate and creep tests on polyphase-polycrystalline Ti-6242. The validated model is further used to obtain macroscopic flow stress dependence on grain size and lath size in Ti-6242 through constant strain rate simulations. It is also used to understand the effect of grain size and shape on load-shedding between hard and soft oriented grains and to identify critical microstructural and macrostructural variables responsible for localized stress concentration due to load shedding phenomenon. Various microstructural variables such as grain orientation, misorientation, grain size and Schmid factor and macroscopic variables like composition of phases is considered in a detailed parametric study and the critical combinations of these parameters that result in high stress due to load shedding is identified. Finally load shedding in a realistic microstructure model for polycrystalline Ti-6242 is discussed in which accurate phase volume fractions and orientation and size distributions that are statistically equivalent to those observed in OIM scans are incorporated. The 3D microstructure model accounts for grain shape complexity in load shedding phenomenon and helps in the identification of local hot spots in a realistic microstructure.

Crystal Plasticity Finite Element Methods

Author : Franz Roters
Publisher : John Wiley & Sons
ISBN 13 : 3527642099
Total Pages : 188 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Crystal Plasticity Finite Element Methods by : Franz Roters

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.

Proceedings of the 13th World Conference on Titanium

Author : Vasisht Venkatesh
Publisher : John Wiley & Sons
ISBN 13 : 1119296110
Total Pages : 4024 pages
Book Rating : 4.1/5 (192 download)

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Book Synopsis Proceedings of the 13th World Conference on Titanium by : Vasisht Venkatesh

Download or read book Proceedings of the 13th World Conference on Titanium written by Vasisht Venkatesh and published by John Wiley & Sons. This book was released on 2016-04-26 with total page 4024 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the Proceedings of the 13th World Conference on Titanium.

Texture Informed Crystal Plasticity Finite Element Modeling of Polycrystalline Material Deformation

Author : Zhe Leng
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (91 download)

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Book Synopsis Texture Informed Crystal Plasticity Finite Element Modeling of Polycrystalline Material Deformation by : Zhe Leng

Download or read book Texture Informed Crystal Plasticity Finite Element Modeling of Polycrystalline Material Deformation written by Zhe Leng and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The interaction between the dislocation and the grain boundaries is also incorporated in the model. For the near grain boundary regions, particular consideration and finite element formula is applied to account for the additional activation energy term as well as the geometric compatibility of the grain boundary during dislocation penetration events, both of the energy term and the geometric barrier depend on the grain boundary character. The formulations applied here provide a reasonable methodology to understand how the interactions between dislocation and grain boundary affect the overall mechanical behavior and the microstructure, and quantitative comparisons of predicted geometrically necessary dislocation distributions with the those determined experimentally indicates a reasonable agreement, further analysis also indicates that stress concentration, as well as the dislocation patterning, depends highly on the grain boundary characters.

Crystal Plasticity Finite Element Methods

Author : Franz Roters
Publisher : Wiley-VCH
ISBN 13 : 9783527324477
Total Pages : 208 pages
Book Rating : 4.3/5 (244 download)

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Book Synopsis Crystal Plasticity Finite Element Methods by : Franz Roters

Download or read book Crystal Plasticity Finite Element Methods written by Franz Roters and published by Wiley-VCH. This book was released on 2010-11-22 with total page 208 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.

Generalized Continuum Modeling of Scale-dependent Crystalline Plasticity

Author : Jason R. Mayeur
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (757 download)

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Book Synopsis Generalized Continuum Modeling of Scale-dependent Crystalline Plasticity by : Jason R. Mayeur

Download or read book Generalized Continuum Modeling of Scale-dependent Crystalline Plasticity written by Jason R. Mayeur and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of metallic material systems (e.g. pure metals, alloys, metal matrix composites) in a wide range of engineering applications from medical devices to electronic components to automobiles continues to motivate the development of improved constitutive models to meet increased performance demands while minimizing cost. Emerging technologies often incorporate materials in which the dominant microstructural features have characteristic dimensions reaching into the submicron and nanometer regime. Metals comprised of such fine microstructures often exhibit unique and size-dependent mechanical response, and classical approaches to constitutive model development at engineering (continuum) scales, being local in nature, are inadequate for describing such behavior. Therefore, traditional modeling frameworks must be augmented or reformulated to account for such phenomena. Crystal plasticity constitutive models have proven quite capable of capturing first-order microstructural effects such as grain orientation, grain morphology, phase distribution, etc. on the deformation behavior of both single and polycrystals, yet suffer from the same limitations as other local continuum theories with regard to modeling scale-dependent mechanical response. This research is focused on the development, numerical implementation, and application of a novel, physics-based generalized (nonlocal) theory of single crystal plasticity. Two distinct versions of a dislocation-based micropolar single crystal plasticity theory are developed and discussed within the context of more prominent nonlocal crystal plasticity theories. The constitutive models have been implemented in the commercial finite element code Abaqus, and the size-dependent deformation of both single and polycrystalline metals have been studied via direct numerical simulation. A comparison of results obtained from the solution of several equivalent initial-boundary value problems using the developed models and a model of discrete dislocation dynamics has demonstrated the predictive capabilities of the micropolar theory and also highlighted areas for potential model refinement.

A New Crystal Plasticity Formulation to Simulate Large-strain Plasticity of Polycrystalline Metals at Elevated Temperatures

Author : Edward D. Cyr
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (988 download)

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Book Synopsis A New Crystal Plasticity Formulation to Simulate Large-strain Plasticity of Polycrystalline Metals at Elevated Temperatures by : Edward D. Cyr

Download or read book A New Crystal Plasticity Formulation to Simulate Large-strain Plasticity of Polycrystalline Metals at Elevated Temperatures written by Edward D. Cyr and published by . This book was released on 2017 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation explores the plasticity polycrystalline metals, with particular attention paid to aluminum and its alloys. Specifically aluminum Al-Mg sheet alloys, which are currently replacing steel parts for panel and some structural componentry in the automotive industry. At the forefront of this transition, is the problem of poor room-temperature formability of the aluminum sheet when compared to its steel counterparts. A promising solution to this has been the use of warm-forming to increase formability, preventing redesign of automotive parts from steel to aluminum (Li and Ghosh, 2003). In this thesis, a new constitutive framework and methodology is developed to accurately model elevated temperature behaviour of polycrystalline aluminum. This study describes a picture of the physics behind slip dominated deformation in polycrystalline metals, and the mechanical characterization techniques used to determine modeling parameters for crystal plasticity. A review on modeling techniques and published work on the versatility of crystal plasticity theory and application is also presented. An initial model is then developed for a fully temperature dependent crystal plasticity framework. The model employs a generic hardening law to study the effect of temperature on material hardening, and conclusions are made on the lack of microstructural correlation between the model and physical behaviour of the material. The same framework is then implemented in the well known Marciniak-Kuzynski (1967) based limit strain formulation as an application study with Chang and Asaro (1981) type hardening. Temperature dependency is studied and formability is predicted for different aluminum alloys. The study reveals that, again, phenomenological-based hardening is only satisfactory for predicting elevated-temperature behaviour, and results are very sensitive to model input parameters. In the second half of this dissertation, a physical model is carefully developed from fundamental dislocation theories. The model is formulated on the basis of accumulation of dislocations as the dominating strengthening mechanism in polycrystals, introduces recovery as a thermally activated process leading to temperature dependent softening. The model is used to study temperature dependency of slip deformation in pure aluminum, and the correlation between physical processes and model parameters. The model is able to capture and predict deformation response, as well as suggest explanation to the influence of temperature on microstructural behaviour. Finally, the model is applied to study the temperature dependency of microstructural parameters in 5xxx series Al-Mg sheet alloys. Experimental data is used to characterized material parameters at warm forming temperatures, and the model is used to predict stress-strain response. The model is then used to discuss the effect of temperature on two different alloys and suggests explanation on the microstructural causes leading to variation hardening behaviour between the two alloys over the temperature range studied. The work then concludes the improvement of model predictability, and the utility of such a model in microstructural design.

Micromechanics of Polycrystalline TI-5AL-2.5SN Using Differential Aperture X-ray Microscopy and Crystal Plasticity Simulation

Author : Chen Zhang
Publisher :
ISBN 13 : 9780438299856
Total Pages : 199 pages
Book Rating : 4.2/5 (998 download)

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Book Synopsis Micromechanics of Polycrystalline TI-5AL-2.5SN Using Differential Aperture X-ray Microscopy and Crystal Plasticity Simulation by : Chen Zhang

Download or read book Micromechanics of Polycrystalline TI-5AL-2.5SN Using Differential Aperture X-ray Microscopy and Crystal Plasticity Simulation written by Chen Zhang and published by . This book was released on 2018 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A New Spectral Framework for Crystal Plasticity Modeling of Cubic and Hexagonal

Author : Marko Knezevic
Publisher :
ISBN 13 :
Total Pages : 290 pages
Book Rating : 4.:/5 (369 download)

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Book Synopsis A New Spectral Framework for Crystal Plasticity Modeling of Cubic and Hexagonal by : Marko Knezevic

Download or read book A New Spectral Framework for Crystal Plasticity Modeling of Cubic and Hexagonal written by Marko Knezevic and published by . This book was released on 2009 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Titanium

Author : Matthew J. Donachie
Publisher : ASM International
ISBN 13 : 161503062X
Total Pages : 381 pages
Book Rating : 4.6/5 (15 download)

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Book Synopsis Titanium by : Matthew J. Donachie

Download or read book Titanium written by Matthew J. Donachie and published by ASM International. This book was released on 2000 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed to support the need of engineering, management, and other professionals for information on titanium by providing an overview of the major topics, this book provides a concise summary of the most useful information required to understand titanium and its alloys. The author provides a review of the significant features of the metallurgy and application of titanium and its alloys. All technical aspects of the use of titanium are covered, with sufficient metals property data for most users. Because of its unique density, corrosion resistance, and relative strength advantages over competing materials such as aluminum, steels, and superalloys, titanium has found a niche in many industries. Much of this use has occurred through military research, and subsequent applications in aircraft, of gas turbine engines, although more recent use features replacement joints, golf clubs, and bicycles.Contents include: A primer on titanium and its alloys, Introduction to selection of titanium alloys, Understanding titanium's metallurgy and mill products, Forging and forming, Castings, Powder metallurgy, Heat treating, Joining technology and practice, Machining, Cleaning and finishing, Structure/processing/property relationships, Corrosion resistance, Advanced alloys and future directions, Appendices: Summary table of titanium alloys, Titanium alloy datasheets, Cross-reference to titanium alloys, Listing of selected specification and standardization organizations, Selected manufacturers, suppliers, services, Corrosion data, Machining data.

Titanium and Titanium Alloys

Author : Christoph Leyens
Publisher : John Wiley & Sons
ISBN 13 : 3527605207
Total Pages : 532 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Titanium and Titanium Alloys by : Christoph Leyens

Download or read book Titanium and Titanium Alloys written by Christoph Leyens and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is an excellent reference for materials scientists and engineers needing to gain more knowledge about these engineering materials. Following introductory chapters on the fundamental materials properties of titanium, readers will find comprehensive descriptions of the development, processing and properties of modern titanium alloys. There then follows detailed discussion of the applications of titanium and its alloys in aerospace, medicine, energy and automotive technology.

Microplasticity

Author : Charles J. McMahon
Publisher :
ISBN 13 :
Total Pages : 448 pages
Book Rating : 4.:/5 (359 download)

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Book Synopsis Microplasticity by : Charles J. McMahon

Download or read book Microplasticity written by Charles J. McMahon and published by . This book was released on 1968 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Mesoscale Models

Author : Sinisa Mesarovic
Publisher : Springer
ISBN 13 : 3319941860
Total Pages : 348 pages
Book Rating : 4.3/5 (199 download)

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Book Synopsis Mesoscale Models by : Sinisa Mesarovic

Download or read book Mesoscale Models written by Sinisa Mesarovic and published by Springer. This book was released on 2018-11-19 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book helps to answer the following questions: How far have the understanding and mesoscale modeling advanced in recent decades, what are the key open questions that require further research and what are the mathematical and physical requirements for a mesoscale model intended to provide either insight or a predictive engineering tool? It is addressed to young researchers including doctoral students, postdocs and early career faculty,

Continuum Scale Simulation of Engineering Materials

Author : Dierk Raabe
Publisher : John Wiley & Sons
ISBN 13 : 3527604219
Total Pages : 885 pages
Book Rating : 4.5/5 (276 download)

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Book Synopsis Continuum Scale Simulation of Engineering Materials by : Dierk Raabe

Download or read book Continuum Scale Simulation of Engineering Materials written by Dierk Raabe and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 885 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Integrated Computational Materials Engineering (ICME)

Author : Somnath Ghosh
Publisher : Springer Nature
ISBN 13 : 3030405621
Total Pages : 416 pages
Book Rating : 4.0/5 (34 download)

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Book Synopsis Integrated Computational Materials Engineering (ICME) by : Somnath Ghosh

Download or read book Integrated Computational Materials Engineering (ICME) written by Somnath Ghosh and published by Springer Nature. This book was released on 2020-03-20 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces research advances in Integrated Computational Materials Engineering (ICME) that have taken place under the aegis of the AFOSR/AFRL sponsored Center of Excellence on Integrated Materials Modeling (CEIMM) at Johns Hopkins University. Its author team consists of leading researchers in ICME from prominent academic institutions and the Air Force Research Laboratory. The book examines state-of-the-art advances in physics-based, multi-scale, computational-experimental methods and models for structural materials like polymer-matrix composites and metallic alloys. The book emphasizes Ni-based superalloys and epoxy matrix carbon-fiber composites and encompasses atomistic scales, meso-scales of coarse-grained models and discrete dislocations, and micro-scales of poly-phase and polycrystalline microstructures. Other critical phenomena investigated include the relationship between microstructural morphology, crystallography, and mechanisms to the material response at different scales; methods of identifying representative volume elements using microstructure and material characterization, and robust deterministic and probabilistic modeling of deformation and damage. Encompassing a slate of topics that enable readers to comprehend and approach ICME-related issues involved in predicting material performance and failure, the book is ideal for mechanical, civil, and aerospace engineers, and materials scientists, in in academic, government, and industrial laboratories.

Superplasticity in Advanced Materials - ICSAM 2018

Author : Goroh Itoh
Publisher : Trans Tech Publications Ltd
ISBN 13 : 3035733457
Total Pages : 494 pages
Book Rating : 4.0/5 (357 download)

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Book Synopsis Superplasticity in Advanced Materials - ICSAM 2018 by : Goroh Itoh

Download or read book Superplasticity in Advanced Materials - ICSAM 2018 written by Goroh Itoh and published by Trans Tech Publications Ltd. This book was released on 2018-07-20 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume includes selected and peer reviewed papers presented at the 13th International Conference on Superplasticity in Advanced Materials (ICSAM 2018), August 19-22, 2018, St. Petersburg, Russia. We hope this collection will be interesting and useful for many specialists whose scientific and engineering activity is related to the area of superplastic materials, research of the mechanisms of superplasticity and superplastic processing technologies.