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Modelling Damage And Deformation Behaviour Of A Nickel Based Superalloy Using Constitutive Models
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Book Synopsis Modelling Damage and Deformation Behaviour of a Nickel-based Superalloy Using Constitutive Models by : Christophe Cornet
Download or read book Modelling Damage and Deformation Behaviour of a Nickel-based Superalloy Using Constitutive Models written by Christophe Cornet and published by . This book was released on 2009 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Deformation Modeling and Constitutive Modeling for Anisotropic Superalloys by : Walter W. Milligan
Download or read book Deformation Modeling and Constitutive Modeling for Anisotropic Superalloys written by Walter W. Milligan and published by . This book was released on 1989 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nickel Base Single Crystals Across Length Scales by : Loeïz Nazé
Download or read book Nickel Base Single Crystals Across Length Scales written by Loeïz Nazé and published by Elsevier. This book was released on 2021-09-28 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel Base Single Crystals Across Length Scales is addresses the most advanced knowledge in metallurgy and computational mechanics and how they are applied to superalloys used as bare materials or with a thermal barrier coating system. Joining both aspects, the book helps readers understand the mechanisms driving properties and their evolution from fundamental to application level. These guidelines are helpful for students and researchers who wish to understand issues and solutions, optimize materials, and model them in a cross-check analysis, from the atomistic to component scale. The book is useful for students and engineers as it explores processing, characterization and design. Provides an up-to-date overview on the field of superalloys Covers the relationship between microstructural evolution and mechanical behavior at high temperatures Discusses both basic and advanced modeling and characterization techniques Includes case studies that illustrate the application of techniques presented in the book
Book Synopsis A Constitutive Model for the Inelastic Multiaxial Cyclic Response of a Nickel Base Superalloy Rene 80 by : V. G. Ramaswamy
Download or read book A Constitutive Model for the Inelastic Multiaxial Cyclic Response of a Nickel Base Superalloy Rene 80 written by V. G. Ramaswamy and published by . This book was released on 1986 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Generic Behavior Framework of SX and DS Nickel-base Superalloys with Applications to Constitutive and Life Prediction Modeling by : Firat Irmak
Download or read book Generic Behavior Framework of SX and DS Nickel-base Superalloys with Applications to Constitutive and Life Prediction Modeling written by Firat Irmak and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selection of materials to be used for components experiencing extreme conditions is a critical process in the design phase. Nickel-base superalloys have been frequently used for hot gas path components in the turbomachinery industry. These components are required to withstand both fatigue and creep at extreme temperatures during their service time. In general, the extreme temperature materials mostly embody polycrystalline, directionally solidified, and single crystal superalloys. It is essential for design engineers to predict accurate damage behavior and lifespan for these components to prevent catastrophic failures. This dissertation presents a new framework to represent mechanical behavior of Nickel-base superalloys under variety of loading conditions. A set of constitutive and lifing models that can be applied broadly are developed based on observed trends. Despite the development of over 30 variations of single crystal and directionally solidified Nickel-base superalloys, the behavior of these alloys nominally follows similar trends with respect to temperature and orientation. Temperature-, rate-, and orientation- dependence of these materials are studied. The goal is to eliminate extensive time and cost of experiments by creating parameters to be used in strength and life calculations for generic single crystal and directionally solidified Nickel-base alloys. In order to apply generic constants to deformation modeling, a crystal-plasticity model is modified to create stress-strain hysteresis loops. Strain, stress and multi-axial life models are developed to represent the lifing behavior of the candidate alloys under uniaxial and multiaxial environments. Tensile and low-cycle fatigue experiments are conducted to measure the accuracy of these models. Parameters for the models are built on regression fits in comparison with a comprehensive material database. This database includes elastic, plastic, creep, and fatigue properties.
Book Synopsis A Constitutive Model for the Inelastic Multiaxial Cyclic Response of a Nickel Base Superalloy René 80 by : Vadakanchery Ganapahty Ramaswamy
Download or read book A Constitutive Model for the Inelastic Multiaxial Cyclic Response of a Nickel Base Superalloy René 80 written by Vadakanchery Ganapahty Ramaswamy and published by . This book was released on 1986 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Ductile Fracture Behavior of a Nickel-based Superalloy and Thermally-induced Strain Behavior of an Aluminum Alloy by : Jarrod Lee Smith
Download or read book Ductile Fracture Behavior of a Nickel-based Superalloy and Thermally-induced Strain Behavior of an Aluminum Alloy written by Jarrod Lee Smith and published by . This book was released on 2015 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to generate experimental data that can be used to calibrate and validate constitutive models for plastic deformation and failure that are implemented in numerical simulations. In the first part of the research, tension tests are conducted at elevated temperatures on notched and unnotched thin flat specimens made of a nickel-based superalloy. The geometry of each sample is designed to induce various states of stress inherent in original jet engine components. Three-dimensional Digital Image Coorelation (3D-DIC) is used to measure the full-field deformations. The results of these tests show the setup is successful in capturing displacements and strains on the surface of each sample at elevated temperatures for ductile materials. The force versus displacement curves reveal that the nickel-based superalloy being tested exhibits thermal softening and serrated flow due to strain localizations at elevated temperatures. The second part of the research introduces a method to characterize the thermally induced strain behavior of a 6000 series aluminum alloy during the car manufacturing process. To simulate the stamping process, dogbone and rectangular strip specimens are subject to uniaxial and bending strains. A method for measuring strains on the surface of specimens during bend tests is established. Following deformation, specimens are subjected to thermal heating cycles that simulate the paint-bake cycle. The thermally induced strains during the heating cycle are measured for the each of the specimens. In addition, the material properties and thermal buckling behavior of the aluminum at various temperatures are investigated. The results show that specimens subject to different bending strains display elevated coefficients of thermal expansion and residual strain after being rendered to a heating cycle. The measurements from the material property and thermal buckling testing can be used to calibrate a thermally dependent material model.
Book Synopsis Cyclic Plasticity of Metals by : Hamid Jahed
Download or read book Cyclic Plasticity of Metals written by Hamid Jahed and published by Elsevier. This book was released on 2021-11-11 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cyclic Plasticity of Metals: Modeling Fundamentals and Applications provides an exhaustive overview of the fundamentals and applications of various cyclic plasticity models including forming and spring back, notch analysis, fatigue life prediction, and more. Covering metals with an array of different structures, such as hexagonal close packed (HCP), face centered cubic (FCC), and body centered cubic (BCC), the book starts with an introduction to experimental macroscopic and microscopic observations of cyclic plasticity and then segues into a discussion of the fundamentals of the different cyclic plasticity models, covering topics such as kinematics, stress and strain tensors, elasticity, plastic flow rule, and an array of other concepts. A review of the available models follows, and the book concludes with chapters covering finite element implementation and industrial applications of the various models. Reviews constitutive cyclic plasticity models for various metals and alloys with different cell structures (cubic, hexagonal, and more), allowing for more accurate evaluation of a component’s performance under loading Provides real-world industrial context by demonstrating applications of cyclic plasticity models in the analysis of engineering components Overview of latest models allows researchers to extend available models or develop new ones for analysis of an array of metals under more complex loading conditions
Book Synopsis Constitutive Modeling and Life Prediction in Ni-base Superalloys by : Mahesh M. Shenoy
Download or read book Constitutive Modeling and Life Prediction in Ni-base Superalloys written by Mahesh M. Shenoy and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Microstructural features at different scales affect the constitutive stress-strain response and the fatigue crack initiation life in Ni-base superalloys. While numerous efforts have been made in the past to experimentally characterize the effects of these features on the stress-strain response and/or the crack initiation life, there is a significant variability in the data with sometimes contradictory conclusions, in addition to the substantial costs involved in experimental testing. Computational techniques can be useful tools to better understand these effects since they are relatively inexpensive and are not restricted by the limitations in processing techniques. The effect of microstructure on the stress-strain response and the variability in fatigue life were analyzed using two Ni-base superalloys; DS GTD111 which is a directionally solidified Ni-base superalloy, and IN100 which is a polycrystalline Ni-base superalloy. Physically-based constitutive models were formulated and implemented as user material subroutines in ABAQUS using the single crystal plasticity framework which can predict the material stress-strain response with the microstructure-dependence embedded into them. The model parameters were calibrated using experimental cyclic stress-strain histories. A computational exercise was employed to quantify the influence of idealized microstructural variables on the fatigue crack initiation life. Understanding was sought regarding the most significant microstructure features using explicit modeling of the microstructure with the aim to predict the variability in fatigue crack initiation life and to guide material design for fatigue resistant microstructures. Lastly, it is noted that crystal plasticity models are often too computationally intensive if the objective is to model the macroscopic behavior of a textured or randomly oriented 3-D polycrystal in an engineering component. Homogenized constitutive models were formulated and implemented as user material subroutines in ABAQUS, which can capture the macroscale stress-strain response in both DS GTD111 and IN100. Even though the study was conducted on two specific Ni-base superalloys; DS GTD111 and IN100, the objective was to develop generic frameworks which should also be applicable to other alloy systems.
Book Synopsis Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications by : Eric Ott
Download or read book Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications written by Eric Ott and published by Springer. This book was released on 2018-05-12 with total page 1092 pages. Available in PDF, EPUB and Kindle. Book excerpt: This technical meeting will focus on Alloy 718 and Superalloys in this class relative to alloy and process development, production, product applications, trends and the development of advanced modeling tools. The symposium provides an opportunity for authors to present technical advancements relative to a broad spectrum of areas while assessing their impact on related fields associated with this critical alloy group. There are continuing innovations relative to these alloys as well as novel processing techniques which continue to extend applications in very challenging environments ranging from corrosion resistance in the deep sea to high-stressed space applications.
Book Synopsis Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing by : Jinghao Xu
Download or read book Alloy Design and Characterization of γ′ Strengthened Nickel-based Superalloys for Additive Manufacturing written by Jinghao Xu and published by Linköping University Electronic Press. This book was released on 2021-01-28 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nickel-based superalloys, an alloy system bases on nickel as the matrix element with the addition of up to 10 more alloying elements including chromium, aluminum, cobalt, tungsten, molybdenum, titanium, and so on. Through the development and improvement of nickel-based superalloys in the past century, they are well proved to show excellent performance at the elevated service temperature. Owing to the combination of extraordinary high-temperature mechanical properties, such as monotonic and cyclic deformation resistance, fatigue crack propagation resistance; and high-temperature chemical properties, such as corrosion and oxidation resistance, phase stability, nickel-based superalloys are widely used in the critical hot-section components in aerospace and energy generation industries. The success of nickel-based superalloy systems attributes to both the well-tailored microstructures with the assistance of carefully doped alloying elements, and the intently developed manufacturing processes. The microstructure of the modern nickel-based superalloys consists of a two-phase configuration: the intermetallic precipitates (Ni,Co)3(Al,Ti,Ta) known as γ′ phase dispersed into the austenite γ matrix, which is firstly introduced in the 1940s. The recently developed additive manufacturing (AM) techniques, acting as the disruptive manufacturing process, offers a new avenue for producing the nickel-based superalloy components with complicated geometries. However, γ′ strengthened nickel-based superalloys always suffer from the micro-cracking during the AM process, which is barely eliminated by the process optimization. On this basis, the new compositions of γ′ strengthened nickel-based superalloy adapted to the AM process are of great interest and significance. This study sought to design novel γ′ strengthened nickel-based superalloys readily for AM process with limited cracking susceptibility, based on the understanding of the cracking mechanisms. A two-parameter model is developed to predict the additive manufacturability for any given composition of a nickel-based superalloy. One materials index is derived from the comparison of the deformation-resistant capacity between dendritic and interdendritic regions, while another index is derived from the difference of heat resistant capacity of these two spaces. By plotting the additive manufacturability diagram, the superalloys family can be categorized into the easy-to-weld, fairly-weldable, and non-weldable regime with the good agreement of the existed knowledge. To design a novel superalloy, a Cr-Co-Mo-W-Al-Ti-Ta-Nb-Fe-Ni alloy family is proposed containing 921,600 composition recipes in total. Through the examination of additive manufacturability, undesired phase formation propensity, and the precipitation fraction, one composition of superalloy, MAD542, out of the 921,600 candidates is selected. Validation of additive manufacturability of MAD542 is carried out by laser powder bed fusion (LPBF). By optimizing the LPBF process parameters, the crack-free MAD542 part is achieved. In addition, the MAD542 superalloy shows great resistance to the post-processing treatment-induced cracking. During the post-processing treatment, extensive annealing twins are promoted to achieve the recrystallization microstructure, ensuring the rapid reduction of stored energy. After ageing treatment, up to 60-65% volume fraction of γ′ precipitates are developed, indicating the huge potential of γ′ formation. Examined by the high-temperature slow strain rate tensile and constant loading creep testing, the MAD542 superalloy shows superior strength than the LPBF processed and hot isostatic pressed plus heat-treated IN738LC superalloy. While the low ductility of MAD542 is existed, which is expected to be improved by modifying the post-processing treatment scenarios and by the adjusting building direction in the following stages of the Ph.D. research. MAD542 superalloy so far shows both good additive manufacturability and mechanical potentials. Additionally, the results in this study will contribute to a novel paradigm for alloy design and encourage more γ′-strengthened nickel-based superalloys tailored for AM processes in the future.
Book Synopsis Deformation Modeling and Constitutive Modeling for Anisotropic Superalloys by : Walter W. Milligan
Download or read book Deformation Modeling and Constitutive Modeling for Anisotropic Superalloys written by Walter W. Milligan and published by . This book was released on 1989 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Mechanics of Constitutive Modeling by : Niels Saabye Ottosen
Download or read book The Mechanics of Constitutive Modeling written by Niels Saabye Ottosen and published by Elsevier. This book was released on 2005-09-28 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constitutive modelling is the mathematical description of how materials respond to various loadings. This is the most intensely researched field within solid mechanics because of its complexity and the importance of accurate constitutive models for practical engineering problems. Topics covered include: Elasticity - Plasticity theory - Creep theory - The nonlinear finite element method - Solution of nonlinear equilibrium equations - Integration of elastoplastic constitutive equations - The thermodynamic framework for constitutive modelling – Thermoplasticity - Uniqueness and discontinuous bifurcations • More comprehensive in scope than competitive titles, with detailed discussion of thermodynamics and numerical methods. • Offers appropriate strategies for numerical solution, illustrated by discussion of specific models. • Demonstrates each topic in a complete and self-contained framework, with extensive referencing.
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1988 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book The Superalloys written by Roger C. Reed and published by Cambridge University Press. This book was released on 2008-07-31 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Superalloys are unique high-temperature materials used in gas turbine engines, which display excellent resistance to mechanical and chemical degradation. This book introduces the metallurgical principles which have guided their development. Suitable for graduate students and researchers, it includes exercises and additional resources at www.cambridge.org/9780521859042.
Book Synopsis Advanced Theories for Deformation, Damage and Failure in Materials by : Holm Altenbach
Download or read book Advanced Theories for Deformation, Damage and Failure in Materials written by Holm Altenbach and published by Springer Nature. This book was released on 2022-08-31 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book introduces advanced theories for deformation, damage, and failure in materials. The overall continuum mechanical framework was marked out and added by creep and damage mechanics of materials at elevated temperatures. The time-dependent and time-independent models of cyclic plasticity for low cycle and thermomechanical fatigue life assessment were specified in a very special manner: instead of three-dimensional statements, only one-dimensional rheological models were discussed. Anisotropic plasticity during non-proportional loading and anisotropy of yield/failure criteria is more and more important in modern applications. It is showing how the limit states of materials can be estimated. In addition, the damage and failure of composite materials demonstrate the possibility to extend continuum mechanics to continuum damage mechanics of composite materials.
