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Book Hot Tensile Behavior of Ti 6Al 4V Alloy Using Artificial Neural Network and Constitutive Modeling

Download or read book Hot Tensile Behavior of Ti 6Al 4V Alloy Using Artificial Neural Network and Constitutive Modeling written by Abbas Vagharfard and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays a considerable quantity of metallic parts has been manufactured via metal forming processes, such as rolling, stamping, drawing, etc. at the ambient temperature. However, limited workability of some alloys may lead to shaping them at higher temperatures, where the material can flow more easily and the part would contain less defects. Since the stress at low temperature is a function of strain (the relative amount of deformation), the flow behavior of material at these temperature is rather straightforward. At high temperature other parameters, namely temperature and strain rates, should be also taken into account in predicting the flow stress. Our goal in this research is to predict the high temperature behavior by introducing different constitutive and numerical approaches. The Ti-6Al-4V alloy's promising mechanical properties such as excellent strength-to-weight ratio and great chemical and thermal resistance make it a great choice to be applied in different industries such as medical, marine, aerospace. This Thesis focuses on predicting the behavior of this alloy under tension at high temperatures and aims to find a model which can describe the stress-strain relevance accurately under desired external circumstances required for any deformation process. There are various models trying to exploit the non-linear stress dependencies on temperature, strain, and strain rate. Herein, the constitutive and the Artificial Neural Network (ANN) models will be explained with all their benefits and drawbacks in details. For the constitutive model the material constants will be derived, the model will be developed, and the obtained results are considered for prediction accuracy comparisons. Afterwards, the ANN multi-layer feedforward with backpropagation and Radial Basis Function (RBFN) network will be discussed. These networks can operate as a Blackbox to predict the unknown and highly nonlinear relationship between input and output parameters. Two ANNs feed forward networks with different layers and neurons in each layer, as well as an RBFN are trained and simulated using the MATLAB Toolbox. The RFBN is very efficient for fitting the data especially when there is not a sharp change or interruption in the corresponding true results and there is a function to approximate. The results of all models are compared to each other, first of all in case of a well fitted model by analyzing the statistical measurements such as Correlation Coefficient (R), Average Absolute Relative Error (AARE) and Root Mean Square Error (RMSE). The results demonstrate a clear improvement from the constitutive model to ANN feed forward networks, and later RBFN with 0.999, 2.17 %, and 1.59 for the corresponding modules. The other important criterion is how cumbersome it would be to obtain some models, especially constitutive models constants finding or search of a global minimum for feed forward network. So the RBFN is found to be the best method of training a favorable network. Recently, there are many studies aiming to reduce the number of neurons in the RBFN. Those methods could be really helpful to figure out the important data points giving the most useful information about the stress-strain curves and later finding the optimal experiments giving the perfect results. This could be a great opportunity as reducing the cost of investigation could help to predict behavior of a wide range of materials properly, and pave the way for industries to exploit new desired mechanical properties.

Book Proceedings of the 13th World Conference on Titanium

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 2004 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the Proceedings of the 13th World Conference on Titanium.

Book Superplasticity in Advanced Materials ICSAM 2018

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.

Book Ultrafine Grained Metals

Download or read book Ultrafine Grained Metals written by Heinz Werner Höppel and published by MDPI. This book was released on 2018-07-02 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Ultrafine-grained Metals" that was published in Metals

Book Metallurgy and Design of Alloys with Hierarchical Microstructures

Download or read book Metallurgy and Design of Alloys with Hierarchical Microstructures written by Krishnan K. Sankaran and published by Elsevier. This book was released on 2017-06-14 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metallurgy and Design of Alloys with Hierarchical Microstructures covers the fundamentals of processing-microstructure-property relationships and how multiple properties are balanced and optimized in materials with hierarchical microstructures widely used in critical applications. The discussion is based principally on metallic materials used in aircraft structures; however, because they have sufficiently diverse microstructures, the underlying principles can easily be extended to other materials systems. With the increasing microstructural complexity of structural materials, it is important for students, academic researchers and practicing engineers to possess the knowledge of how materials are optimized and how they will behave in service. The book integrates aspects of computational materials science, physical metallurgy, alloy design, process design, and structure-properties relationships, in a manner not done before. It fills a knowledge gap in the interrelationships of multiple microstructural and deformation mechanisms by applying the concepts and tools of designing microstructures for achieving combinations of engineering properties—such as strength, corrosion resistance, durability and damage tolerance in multi-component materials—used for critical structural applications. - Discusses the science behind the properties and performance of advanced metallic materials - Provides for the efficient design of materials and processes to satisfy targeted performance in materials and structures - Enables the selection and development of new alloys for specific applications based upon evaluation of their microstructure as illustrated in this work

Book Mechanical Behavior Assessment of Ti 6Al 4V Alloy Produced by Laser Powder Bed Fusion

Download or read book Mechanical Behavior Assessment of Ti 6Al 4V Alloy Produced by Laser Powder Bed Fusion written by Asif Mahmud and published by . This book was released on 2020 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work correlates quasi-static, tensile mechanical properties of additively manufactured Ti-6Al-4V (Grade 23) alloy to the phase constituents, microstructure and fracture surface characteristics that changed with post-heat treatment of stress relief (670 °C for 5h) and hot isostatic pressing (HIP with 100MPa at 920 °C for 2h). Ti-6Al-4V alloy tensile specimens in both the horizontal (i.e., X and Y) and vertical (Z) directions were produced by laser powder bed fusion (LPBF) technique. Mechanical properties were determined using quasi-static, tensile testing for both the as-stress-relieved (ASR) and HIP specimens. For the ASR and HIP samples built in X, Y and Z directions, density by Archimedes principle and image analysis, phase constituents by X-ray diffraction and Rietveld technique, microstructure and fracture surface by optical and electron microscopy, and microhardness by Vickers were examined. Higher yield strength (1141 MPa), higher tensile strength (1190 MPa), but lower elongation at fracture (6.9 %) along with a mechanical anisotropy were observed for ASR samples. After HIP, an isotropic mechanical behavior was observed with a slight reduction in yield strength (928 MPa) and tensile strength (1003 MPa), but with a significant improvement in elongation at fracture (16.1%). These properties satisfy the industry specification. Phase constituents of acicular [alpha]' phase in ASR and lamellar [alpha] + [beta] phases in HIP samples were consistently observed to substantiate the reduction in strength, but the anisotropic variation in elongation at fracture observed for the ASR samples was related to the presence of "lack-of-fusion" flaws.

Book Characterization and Modeling of the Thermo mechanical Behavior of a Ti 6Al 4V Alloy Under Dynamic Complex Loading

Download or read book Characterization and Modeling of the Thermo mechanical Behavior of a Ti 6Al 4V Alloy Under Dynamic Complex Loading written by Miguel Ruiz De Sotto and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the aircraft engine certification, various components are tested against ballisticphenomena. The engine fan must accordingly resist bird strike and blade loss withoutcompromising the whole engine thrust performance. Fan blades, and particularly theirleading edge, undergo large deformation under high strain rate, non-proportional loadingpaths and plastic dissipation induced self-heating. Due to their high specific mechanicalproperties, Ti-6Al-4V titanium alloys are promising candidates for fan multi-componentblade leading edge. In this work, an experimental campaign has been carried out on acold rolled Ti-6Al-4V alloy comprising tension, compression and shear tests performed atvarious temperatures and (low and high) strain rates, under monotonic and alternatedloading paths. Based on these results, a constitutive model has been developed accountingfor the combined effects of orthotropy, strength differential, nonlinear kinematic andisotropic hardenings, strain rate hardening as well as thermal softening. Material constantshave been identified using Zset software. The model has been implemented asuser material (Fortran) subroutine into the commercial finite element computation codeLS-DYNA. The performances of the numerical model have then been estimated by conductingnumerical simulations considering a volume element under various loading pathsas well as the specimens used for the experimental campaign.

Book Integrated Computational Materials Engineering

Download or read book Integrated Computational Materials Engineering written by National Research Council and published by National Academies Press. This book was released on 2008-10-24 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated computational materials engineering (ICME) is an emerging discipline that can accelerate materials development and unify design and manufacturing. Developing ICME is a grand challenge that could provide significant economic benefit. To help develop a strategy for development of this new technology area, DOE and DoD asked the NRC to explore its benefits and promises, including the benefits of a comprehensive ICME capability; to establish a strategy for development and maintenance of an ICME infrastructure, and to make recommendations about how best to meet these opportunities. This book provides a vision for ICME, a review of case studies and lessons learned, an analysis of technological barriers, and an evaluation of ways to overcome cultural and organizational challenges to develop the discipline.

Book High Temperature Deformation Behavior of Ti 6A1 4V Alloy with Widmanstaten Microstructure

Download or read book High Temperature Deformation Behavior of Ti 6A1 4V Alloy with Widmanstaten Microstructure written by and published by . This book was released on 2003 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research established a constitutive model for high-temperature deformation of Ti-6Al-4V alloy with a transformed microstructure. It further investigated the morphological (alpha platelet thickness) effect on the high-temperature plastic flow of transformed microstructure in view of inelastic deformation theory.

Book Deformation mechanism Maps

Download or read book Deformation mechanism Maps written by H. J. Frost and published by Pergamon. This book was released on 1982 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Forming the Future

Download or read book Forming the Future written by Glenn Daehn and published by Springer Nature. This book was released on 2021-07-10 with total page 2890 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this collection, scientists and engineers from across industry, academia, and government present their latest improvements and innovations in all aspects of metal forming science and technology, with the intent of facilitating linkages and collaborations among these groups. Chapters cover the breadth of metal forming topics, from fundamental science to industrial application.

Book Metals Abstracts

Download or read book Metals Abstracts written by and published by . This book was released on 1998 with total page 1076 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Chemical Abstracts

Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2566 pages. Available in PDF, EPUB and Kindle. Book excerpt: