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Finite Element Analysis And Design Optimization Of Deep Cold Rolling Of Titanium Alloy At Room And Elevated Temperatures
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Book Synopsis Finite Element Analysis and Design Optimization of Deep Cold Rolling of Titanium Alloy at Room and Elevated Temperatures by : Armin Hadadian
Download or read book Finite Element Analysis and Design Optimization of Deep Cold Rolling of Titanium Alloy at Room and Elevated Temperatures written by Armin Hadadian and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: High strength-to-density ratio, high corrosion resistance and superior biocompatibility are the main advantages of Ti-6Al-4V (Ti64), making it a long been favored titanium alloy for aerospace and biomedical applications. Designing titanium components to last longer and refurbishing of aged ones using surface treatments have become a desirable endeavor considering high environmental damage, difficulty in casting, scarcity and high cost associated with this metal. Among mechanical surface treatments, Deep Cold Rolling (DCR) has been shown to be a very promising process to improve fatigue life by introducing a deep compressive residual stress and work-hardening in the surface layer of components. This process has shown to be superior compared with other surface treatment methods as it yields a better surface quality and induces a deeper residual stress profile which can effectively be controlled through the process parameters (i.e. ball diameter, rolling pressure and feed). However, residual stresses induced through this process at room temperature are generally relaxed upon exposure of the components to elevated operating temperatures. In this work, high-fidelity Finite Element (FE) models have been developed to simulate the DCR process in order to predict the induced residual stresses at room temperature and their subsequent relaxation following exposure to temperature increase. Accuracy of the developed models has been validated using experimental measurements available in the literature. A design optimization strategy has also been proposed to identify the optimal process parameters to maximize the induced beneficial compressive residual stress on and under the surface layer and thus prolong the fatigue life. Conducting optimization directly on the developed high-fidelity FE model is not practical due to high computational cost associated with nonlinear dynamic models. Moreover, responses from the FE models are typically noisy and thus cannot be utilized in gradient based optimization algorithms. In this research study, well-established machine learning principles are employed to develop and validate surrogate analytical models based on the response variables obtained from FE simulations. The developed analytical functions are smooth and can efficiently approximate the residual stress profiles with respect to the process parameters. Moreover the developed surrogate models can be effectively and efficiently utilized as explicit functions for the optimization process. Using the developed surrogate models, conventional (one-sided) DCR process is optimized for a thin Ti64 plate considering the material fatigue properties, operating temperature and external load. It is shown that the DCR process can lead to a tensile balancing residual stress on the untreated side of the component which can have a detrimental effect on the fatigue life. Additionally, application of conventional DCR on thin geometries such as compressor blades can cause manufacturing defects due to unilateral application of the rolling force and can also lead to thermal distortion of the part due to asymmetric profile of the induced residual stresses. Double-sided deep rolling has been shown as a viable alternative to address those issues since both sides of the component are treated simultaneously. The process induces a symmetric residual stress which can be further optimized to achieve a compressive residual stress on both sides of the component. For this case, a design optimization problem is formulated to improve fatigue life in high stress locations on a generic compressor blade. All the optimization problems are formulated for multi-objective functions to achieve most optimal residual stress profiles both at room temperature as well as elevated temperature of 450°C. A hybrid optimization algorithm based on combination of sequential quadratic programming (SQP) technique with stochastic based genetic algorithm (GA) has been developed to accurately catch the global optimum solutions. It has been shown that the optimal solution depends on the stress distribution in the component due to the external load as well as the operating temperature.
Book Synopsis Optimizing High Speed End-milling of Titanium Alloy Using Mechanistic Model, FEA and Experimental Design Techniques by : Sandeep Reddy Aramalla
Download or read book Optimizing High Speed End-milling of Titanium Alloy Using Mechanistic Model, FEA and Experimental Design Techniques written by Sandeep Reddy Aramalla and published by . This book was released on 2006 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents the results of modeling cutting forces, residual stresses and peak tool temperature in High speed end-milling of titanium (Ti-6Al-4V) alloys. Three different approaches namely: Finite element analysis, mechanistic model and experimental verification were used for the modeling and simulating cutting forces"--Abstract, leaf iv.
Book Synopsis Report on Department of Defense Titanium Sheet Rolling Program by : Lee E. Tanner
Download or read book Report on Department of Defense Titanium Sheet Rolling Program written by Lee E. Tanner and published by . This book was released on 1959 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fretting Fatigue Behavior of a Titanium Alloy Ti-6AL-4V at Elevated Temperature by : Onder Sahan
Download or read book Fretting Fatigue Behavior of a Titanium Alloy Ti-6AL-4V at Elevated Temperature written by Onder Sahan and published by . This book was released on 2002-03-01 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research is to investigate the fretting fatigue behavior of the titanium alloy Ti-6Al-4V at elevated temperature is investigated. Fretting and plain fatigue experiments are conducted at 260 . Crack initiation location and crack initiation orientation is measured and fretting and plain fatigue life data of the specimens from these tests are obtained. Fatigue parameters capable of predicting the number of cycles to specimen failure, the crack location and the crack orientation along the contact surface are analyzed. The parameters are calculated by using the computed stresses and strains obtained from the finite element analysis. The mechanisms responsible for the fretting fatigue crack initiation are determined. The effect of elevated temperature is examined by comparing room and elevated temperature fretting and plain fatigue data.
Book Synopsis Finite Element Analysis of Machining Parameters in Milling of Ti6al4v by : Ali Moaz H
Download or read book Finite Element Analysis of Machining Parameters in Milling of Ti6al4v written by Ali Moaz H and published by LAP Lambert Academic Publishing. This book was released on 2015-02-02 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium alloys are considered as difficult metals to machine because of their properties such as corrosion resistant, lightweight, and high temperature. Titanium and its alloy have the highest strength to weight ratio. It has been recognized as an element (Symbol Ti, atomic number 22, atomic weight 47.9). Titanium alloys are applied extensively in aero-engines and especially in gas turbines, on account of their excellent combination of high specific strength, which is pointed out at high temperature, their exceptional resistance to corrosion, and their fracture resistant characteristics. Therefore, the main goal of metal cutting studies is to establish and develop a module that would enable us to predict cutting performance, such as cutting force, surface roughness, cutting temperature, and stress-strain analysis. This prediction can be estimated by using simulation software through modeling, analysis such as finite element method (FEM). Also, it optimizes the cutting process of titanium alloy by using response surface method (RSM).
Download or read book Titanium Alloys written by W Sha and published by Elsevier. This book was released on 2009-04-29 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given their growing importance in the aerospace, automotive, sports and medical sectors, modelling the microstructure and properties of titanium and its alloys is a vital part of research into the development of new applications. This is the first time a book has been dedicated to modelling techniques for titanium.Part one discusses experimental techniques such as microscopy, synchrotron radiation X-ray diffraction and differential scanning calorimetry. Part two reviews physical modelling methods including thermodynamic modelling, the Johnson-Mehl-Avrami method, finite element modelling, the phase-field method, the cellular automata method, crystallographic and fracture behaviour of titanium aluminide and atomistic simulations of interfaces and dislocations relevant to TiAl. Part three covers neural network models and Part four examines surface engineering products. These include surface nitriding: phase composition, microstructure, mechanical properties, morphology and corrosion; nitriding: modelling of hardness profiles and kinetics; and aluminising: fabrication of Ti coatings by mechanical alloying.With its distinguished authors, Titanium alloys: Modelling of microstructure, properties and applications is a standard reference for industry and researchers concerned with titanium modelling, as well as users of titanium, titanium alloys and titanium aluminide in the aerospace, automotive, sports and medical implant sectors. Comprehensively assesses modelling techniques for titanium, including experimental techniques such as microscopy and differential scanning calorimetry Reviews physical modelling methods including thermodynamic modelling and finite element modelling Examines surface engineering products with specific chapters focused on surface nitriding and aluminising
Download or read book Metals Abstracts written by and published by . This book was released on 1997 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of Design Data for Heat Treated Titanium Alloy Sheet by : D. L. White
Download or read book Determination of Design Data for Heat Treated Titanium Alloy Sheet written by D. L. White and published by . This book was released on 1962 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical and physical property data, necessary to fulfill the requirements of Phase II of the Department of Defense Titanium Alloy Sheet Rolling Program, were obtained for selected solution treated and aged titanium alloys in sheet form. Four alloys were investigated: BI20VCA, (Ti-13V-11Cr-3Al), Ti-6Al-4v, Ti-2.5Al-16V, and Ti-4Al-3Mo-1V. They were suppled by the producers in the heat treated condtion from fhree or more heats and three thicknesses of each alloy. Static mechanical property data for tension, compression, bearing, shear and crippling; creep and rupture data for tension, compression, bearing and shear; and axial-load fatigue data were obtained at room and elevated temperatures. Fastener and weld joint data from -320F to 80F and physical properties from -420F to 1200F were obtained. Volume 2b contains procedures and results for creep and fatigue tests.
Book Synopsis Optimization of Shape Rolling Processes Using Finite Element Analysis and Experimental Design Methodology by : Ignacio G. Osio
Download or read book Optimization of Shape Rolling Processes Using Finite Element Analysis and Experimental Design Methodology written by Ignacio G. Osio and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Strength of Cold-rolled Titanium Alloy Screw Threads Under Axial Load by : Engineering Sciences Data Unit
Download or read book Fatigue Strength of Cold-rolled Titanium Alloy Screw Threads Under Axial Load written by Engineering Sciences Data Unit and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Integrating Temperature Dependence Into a Microstructure-sensitive Fatigue Model for Titanium Alloys by : Jared Michael Darius
Download or read book Integrating Temperature Dependence Into a Microstructure-sensitive Fatigue Model for Titanium Alloys written by Jared Michael Darius and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work seeks to integrate temperature dependence into a microstructure-sensitive fatigue model for titanium alloys produced by both extrusion and electron beam melting (EBM) additive manufacturing, revising and enhancing the MultiStage Fatigue (MSF) model as the foundational model framework. Traditional fatigue modeling has required design engineers to conservatively use a lower-bound estimate of fatigue life predictions given a statistically significant spread of experimental data that can span up to two or sometimes three orders of magnitude for a given test condition. This variation in fatigue data has since been accounted for with the advent of the MSF model, linking individual microstructures to their influence on fatigue life in three distinct stages: incubation, small crack growth, and long crack growth. Since the inception of the MSF model in 2003 by McDowell et al. [1] where it was applied to a cast aluminum alloy, its application has been expanded to a wide range of aluminum alloys, magnesium alloys, steels, polymers, and even one titanium alloy made by laser engineered net shaping (LENS). The MSF model correlates a set of parameters to unify model constants for a given material chemistry across a range of alloys and processing methods. Currently, the Ti-6Al-4V (Ti64) alloy is being implemented in aircraft and spacecraft as a corrosion-resistant lightweight structural metal with good strength retention at elevated temperatures. However, the MSF model lacks any temperature dependence. Therefore, this work integrates a temperature dependence to the MSF model for the first time, applying the model to the Ti64 alloy in two new processing methods. First the microstructure of both materials is characterized. Next, monotonic and fatigue experiments are conducted with both extruded and EBM Ti64 at room temperature and at elevated temperatures (150, 300, and 500 °C). Subsequent fractographic analysis reveals the most deleterious microstructures and failure mecha
Book Synopsis Finite Element Simulation and Experimental Investigation of Residual Stresses, Cutting Forces and Surface Roughness in Orthogonal Turning of Titanium Alloy by : Anthony Onochie Oteka
Download or read book Finite Element Simulation and Experimental Investigation of Residual Stresses, Cutting Forces and Surface Roughness in Orthogonal Turning of Titanium Alloy written by Anthony Onochie Oteka and published by . This book was released on 2005 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This research work presents the results of finite element simulation and experimental investigation of residual stresses, cutting forces and surface roughness in orthogonal turning of titanium alloy. The Simulation of residual stresses, cutting forces and temperature in orthogonal turning of titanium alloy were conducted with the AdvantEdge metal cutting modeling software. Results from this study indicates that the circumferential residual stresses analysis for all cases of varying the cutting speed and feedrate were observed to tend towards compressive residual stress as the depth from the workpiece surface increases while surface residual stresses were predicted to be tensile. Cutting forces in Y-direction were observed to be greater than the feed forces in the X-direction"--Abstract, leaf iv.
Book Synopsis Finite Element Deformation Analysis of Long Thin Cantilever Shape Parts in High Speed Ball End Milling of Titanium Alloy Ti-6Al-4V with PCD Tools at Various Tool Inclination Angles by :
Download or read book Finite Element Deformation Analysis of Long Thin Cantilever Shape Parts in High Speed Ball End Milling of Titanium Alloy Ti-6Al-4V with PCD Tools at Various Tool Inclination Angles written by and published by . This book was released on 2016 with total page 0 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.
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.
Book Synopsis Cold Rolling Precision Forming of Shaft Parts by : Jianli Song
Download or read book Cold Rolling Precision Forming of Shaft Parts written by Jianli Song and published by Springer. This book was released on 2017-06-14 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents in detail the theory, processes and equipment involved in cold rolling precision forming technologies, focusing on spline and thread shaft parts. The main topics discussed include the status quo of research on these technologies; the design and calculation of process parameters; the numerical simulation of cold rolling forming processes; and the equipment used. The mechanism of cold rolling forming is extremely complex, and research on the processes, theory and mechanical analysis of spline cold rolling forming has remained very limited to date. In practice, the forming processes and production methods used are mainly chosen on the basis of individual experience. As such, there is a marked lack of both systematic, theory-based guidelines, and of specialized books covering theoretical analysis, numerical simulation, experiments and equipment used in spline cold rolling forming processes. Illustrated using tables, 3D photographs and formula derivations, this book fills that gap in the literature.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1996 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:
