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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 Superplastic Forming Diffusion Bonding Technology of Titanium Alloys

Download or read book Superplastic Forming Diffusion Bonding Technology of Titanium Alloys written by Zhiqiang Li and published by Springer Nature. This book was released on 2023-10-26 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive illustration to the superplastic forming/diffusion bonding (SPF/DB) technology developed over decades of research on titanium alloys, process modeling, and its application. SPF/DB technology plays key roles in building aviation components with complicated structures, with highly beneficial effects when well designed. With the ever-increasing demand on components with multiple layers, there is an urgent need for an updated assessment of traditional and modern SPF/DB processing methods. Success critically depends on making the most practical and effective choice of SPF/DB method for a given application. The book introduces titanium and titanium alloys, SPF/DB processing and its modeling, and applications for building typical single or multiple layer(s) structures. Particular attention is paid to illustrating the microstructure evolution during SPF/DB processes. The information for making technical decisions about optimal choice of measurement and evaluation methods is also given in the book. Each chapter follows a focused and pragmatic format. Fully illustrated throughout, the book presents the state of the art in SPF/DB technology in a manner that makes it useful for engineers to improve the established forming processes and quality of components. This book is an essential reading material for industrial practitioners, academic researchers and postgraduates.

Book Advanced Joining Technologies

Download or read book Advanced Joining Technologies written by Manjaiah M and published by CRC Press. This book was released on 2024-03-13 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers advances in fusion and solid-state welding processes including basics, welding metallurgy, defect formation, and the effect of process parameters on mechanical properties. Details of the microstructural and mechanical behaviors of weldments are included. This book covers challenges encountered during dissimilar welding of metal by fusion and solid-state welding processes, including remedial solutions and hybrid processes to counter the same. Numerical and statistical simulation approaches used in the welding process for parameter optimization and material flow studies are described as well. Features: Provides details related to the microstructural and mechanical behaviors of welded joints developed by different welding processes. Covers recent research content, metallurgical analysis, and simulation aspects. Discusses the joining of plastics and ceramics. Includes a dedicated chapter on machine learning and digital twin in welding. Explores difficulties associated with the joining of dissimilar metals and alloys. This book is aimed at researchers and graduate students in material joining and characterization and welding.

Book Multiaxial Fatigue

Download or read book Multiaxial Fatigue written by Darrell Socie and published by SAE International. This book was released on 1999-12-15 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides practicing engineers, researchers, and students with a working knowledge of the fatigue design process and models under multiaxial states of stress and strain. Readers are introduced to the important considerations of multiaxial fatigue that differentiate it from uniaxial fatigue.

Book Fatigue Performance of Laser Additive Manufactured Ti 6al 4V in Very High Cycle Fatigue Regime Up to 1E9 Cycles

Download or read book Fatigue Performance of Laser Additive Manufactured Ti 6al 4V in Very High Cycle Fatigue Regime Up to 1E9 Cycles written by Eric Wycisk and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Additive manufacturing technologies are in the process of establishing themselves as an alternative production technology to conventional manufacturing, such as casting or milling. Especially laser additive manufacturing (LAM) enables the production of metallic parts with mechanical properties comparable to conventionally manufactured components. Due to the high geometrical freedom in LAM, the technology enables the production of ultra-light weight designs, and therefore gains increasing importance in aircraft and space industry. The high quality standards of these industries demand predictability of material properties for static and dynamic load cases. However, fatigue properties especially in the very high cycle fatigue (VHCF) regime until 109 cycles have not been sufficiently determined yet. Therefore, this paper presents an analysis of fatigue properties of laser additive manufactured Ti-6Al-4V under cyclic tension-tension until 107 cycles and tension-compression load until 109 cycles. For the analysis of laser additive manufactured titanium alloy Ti-6Al-4V, Woehler fatigue tests under tension-tension and tension-compression were carried out in the high cycle and VHCF regime. Specimens in stress-relieved as well as hot-isostatic-pressed conditions were analyzed regarding crack initiation site, mean stress sensitivity, and overall fatigue performance. The determined fatigue properties show values in the range of conventionally manufactured Ti-6Al-4V with particularly good performance for hot-isostatic-pressed additive-manufactured material. For all conditions, the results show no conventional fatigue limit but a constant increase in fatigue life with decreasing loads. No effects of test frequency on life span could be determined. However, independently of testing principle, a shift of crack initiation from surface to internal initiation could be observed with increasing cycles to failure.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Data Sheet on Giga cycle Fatigue Properties of Ti 6Al 4V ELI 900 MPa Class titanium Alloy at High Stress Rations

Download or read book Data Sheet on Giga cycle Fatigue Properties of Ti 6Al 4V ELI 900 MPa Class titanium Alloy at High Stress Rations written by 物質材料研究機構 and published by . This book was released on 2011 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The High Cycle Fatigue Behavior of Ti 6Al 4V Alloy

Download or read book The High Cycle Fatigue Behavior of Ti 6Al 4V Alloy written by R. K. Steel and published by . This book was released on 1975 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cyclic stress-strain behavior and the S/N behavior of a 'pseudo-elastic' alloy, Ti-6Al-4V of coarsened microstructure, and of a 'plastic' material, copper, are compared. In accord with views recently put forth by Freudenthal, important differences are noted between these two types of materials. These differences include the mode of crack initiation, the intensity of the Bauschinger effect, and the level below macroscopic yeild at which long-life fatigue data lie. (Author).

Book Proceedings of the 3rd International Conference on Advanced Surface Enhancement INCASE 2023

Download or read book Proceedings of the 3rd International Conference on Advanced Surface Enhancement INCASE 2023 written by Niroj Maharjan and published by Springer Nature. This book was released on with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Data Sheet on Giga cycle Fatigue Properties of Ti 6Al 4V ELI 900 MPa Class Titanium Alloy

Download or read book Data Sheet on Giga cycle Fatigue Properties of Ti 6Al 4V ELI 900 MPa Class Titanium Alloy written by 物質材料研究機構 and published by . This book was released on 2008 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: