Download or read book Three dimensional Transient Residual Stress Finite Element Analysis for Single and Double Pass Laser Aided Direct Metal material Deposition Process written by Suhash Ghosh and published by . This book was released on 2003 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis is an attempt towards a methodology of finite element analysis (FEA) for the prediction of quenching related macroscopic as well as microscopic residual stresses in laser aided DMD process."--Abstract, p. iii.

Download or read book Numerical Analysis of Thermal Stress and Deformation in Multi layer Laser Metal Deposition Process written by Heng Liu and published by . This book was released on 2014 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Direct metal deposition (DMD) has gained increasing attention in the area of rapid manufacturing and repair. It has demonstrated the ability to produce fully dense metal parts with complex internal structures that could not be achieved by traditional manufacturing methods. However, this process involves extremely high thermal gradients and heating and cooling rates, resulting in residual stresses and distortion, which may greatly affect the product integrity. The purpose of this thesis is to study the features of thermal stress and deformation involved in the DMD process. Utilizing commercial finite element analysis (FEA) software ABAQUS, a 3-D, sequentially coupled, thermo-mechanical model was firstly developed to predict both the thermal and mechanical behavior of the DMD process of Stainless Steel 304. The simulation results show that the temperature gradient along height and length direction can reach 483 K/mm and 1416 K/mm, respectively. The cooling rate of one particular point can be as high as 3000 K/s. After the work piece is cooled down, large tensile stresses are found within the deposited materials and unrecoverable deformation exists. A set of experiments then were conducted to validate the mechanical effects using a laser displacement sensor. Comparisons between the simulated and experimental results show good agreement. The FEA code for this model can be used to predict the mechanical behavior of products fabricated by the DMD process and to help with the optimization of design and manufacturing parameters."--Abstract, page iii.

Download or read book Prediction of Residual Stresses in Laser Glazing and Laser Powder Deposition Processes Using FEM written by Prashanth Kumar Tirukovelluri and published by . This book was released on 2007 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the research is to develop a three-dimensional finite element model for predicting residual stresses that evolve during the Laser Powder Deposition of thin-walled builds using commercially available finite element software, ABAQUS/Standard [5]. The research work was started by developing a finite element model of Laser Glazing process, which is relatively simple when compared to Laser Powder Deposition in modeling perspective as there is no dynamic addition of material. The experience gained from modeling of Laser Glazing was applied to develop a finite element model of Laser Powder Deposition for prediction of residual stresses. The numerical model of Laser Glazing is based on sequentially coupled thermo-mechanical theory and Laser Powder Deposition process on fully coupled thermo-mechanical theory. To simplify the models, symmetry of geometry and boundary conditions were taken into account. In both the models temperature dependent material properties were included. Also, latent heat corresponding to melting was taken into account. The material was defined as elastic-perfectly plastic. The results predicted by the thermal model of Laser Glazing are comparable with analytical solution and are also validated with the results obtained from carefully designed experiments. In the case of finite element model of Laser Powder Deposition, it can be concluded that the results obtained are reasonable based on previous experimental studies by others.

Download or read book Simulation of Metal Forming Processes by the Finite Element Method SIMOP I written by Kurt Lange and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book 3D FEA Simulations in Machining written by Panagiotis Kyratsis and published by Springer Nature. This book was released on 2023-03-14 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers machining simulations using advanced nonlinear finite element analysis (FEA) methodologies coupled with CAD-based techniques. The content increases awareness about the possibilities to reduce the actual experimental work via experimentally validated simulations using nonlinear finite element analysis.

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1993 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Metal Additive Manufacturing written by Dyuti Sarker and published by John Wiley & Sons. This book was released on 2021-10-26 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: METAL ADDITIVE MANUFACTURING A comprehensive review of additive manufacturing processes for metallic structures Additive Manufacturing (AM)—also commonly referred to as 3D printing—builds three-dimensional objects by adding materials layer by layer. Recent years have seen unprecedented investment in additive manufacturing research and development by governments and corporations worldwide. This technology has the potential to replace many conventional manufacturing processes, enable the development of new industry practices, and transform the entire manufacturing enterprise. Metal Additive Manufacturing provides an up-to-date review of all essential physics of metal additive manufacturing techniques with emphasis on both laser-based and non-laser-based additive manufacturing processes. This comprehensive volume covers fundamental processes and equipment, governing physics and modelling, design and topology optimization, and more. The text adresses introductory, intermediate, and advanced topics ranging from basic additive manufacturing process classification to practical and material design aspects of additive manufacturability. Written by a panel of expert authors in the field, this authoritative resource: Provides a thorough analysis of AM processes and their theoretical foundations Explains the classification, advantages, and applications of AM processes Describes the equipment required for different AM processes for metallic structures, including laser technologies, positioning devices, feeder and spreader mechanisms, and CAD software Discusses the opportunities, challenges, and current and emerging trends within the field Covers practical considerations, including design for AM, safety, quality assurance, automation, and real-time control of AM processes Includes illustrative cases studies and numerous figures and tables Featuring material drawn from the lead author’s research and professional experience on laser additive manufacturing, Metal Additive Manufacturing is an important source for manufacturing professionals, research and development engineers in the additive industry, and students and researchers involved in mechanical, mechatronics, automatic control, and materials engineering and science.

Download or read book The Process Design of Three dimensional Open die Forging and the Deformation Analysis of Metal Matrix Composites written by Chinghua Hung and published by . This book was released on 1990 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computer aided Preform Design in Metal Forming by the Finite Element Method written by Naksoo Kim and published by . This book was released on 1989 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hybrid Additive Manufacturing written by Guha Manogharan and published by Academic Press. This book was released on 2020-07 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid Additive Manufacturing: Techniques, Applications and Benefits explains the fundamentals of hybrid AM, definitions, classifications, and principles, as well as key techniques of hybrid AM, its applications, design guidelines, and benefits, with emphasis on key aspects of the system integration process. The core of this subject is in describing how to overcome inherent processing limitations of layer-by-layer AM through the integration of secondary post-processing such as machining or heat treatment. As a result hybrid AM plays a critical role in accelerating the adoption of AM in established design and manufacturing activities. The applications of hybrid AM in both metals and polymers are discussed in this book, as are geometrical dimensioning and tolerancing, material property enhancement, non-traditional surface finishing, in-situ sequential hybrid processing, and integrated process planning. This book will serve not only as an introduction to hybrid AM but also as a handbook for researchers and engineers in mechanical, manufacturing, industrial, electronics, and materials science, thanks to its interdisciplinary approach and detailed case studies. Explains how hybrid manufacturing processes can be used to achieve enhanced material properties and functionality Describes the significance of hybrid additive manufacturing to different parts of the process chain Uses case studies to show how innovative companies are using this technology, how they have overcome challenges they encountered, and the benefits they have experienced

Download or read book New Challenges in Residual Stress Measurements and Evaluation written by Caterina Casavola and published by BoD – Books on Demand. This book was released on 2020-07-22 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual stresses (RS) are stresses present inside materials even in the absence of any applied load. They are of capital importance because they can impact greatly on the mechanical strength of the material, on its dimensional correspondence to design specifications as well as on the fatigue life of the part. RS measurement and evaluation is currently an important research topic where a lot of challenges still need to be addressed. This book aims to provide the reader with an overview of the principal novelties in this field including current limitations and potential future developments. Both radically new experimental approaches as well as recent evolutions of consolidated ones will be presented, along with the latest novelties in the area of numerical residual stress evaluation.

Download or read book Study of Stress Developments in Axi symmetric Products Fabricated by Forging and Machining written by Jiann-Haw Liou and published by . This book was released on 1996 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual stress distribution on manufactured surfaces can decide component performance, longevity, and reliability by affecting material stability, resistance to deformation, accuracy, and fatigue life of products. In order to extend the operating life of products and satisfy the quality of operation during customer usage, it is necessary to monitor residual stresses in parts during the manufacturing process. Design for manufacturing (DFM) is a way to provide design engineers with complete information on the characteristics of product quality. Designers can then decide remedial manufacturing procedures, if necessary, in the design stage without requiring actual manufacturing operation. As a way to develop a computing tool for the DFM and stress information in products, a three-dimensional finite element model to simulate a continuous manufacturing process from forging to machining was developed using a nonlinear finite element program. In the simulation, MILS 11595 was used as workpiece material and stress developments in each stage of operation were calculated. The final residual stress distributions due to forging and machining process were also calculated. The selected calculation results were compared with experimental data and published works to verify the effectiveness of the developed model. Parametric studies of the manufacturing processes of forging and machining were performed to obtain optimum residual stresses in the products. Two-dimensional finite element method and Taguchi method were used to identify the controlling process parameters which had direct effects on the residual stress formation. In the optimization, experimental planning was performed by using the matrix experiment and the signal-to-noise ratio was used in the ANOVA analysis. Frictional coefficients, length of die land, and inlet angle were selected as process parameters in the forging operation. Cutting Speed, feed rate, and depth of cut were selected as controlling process parameters in the machining operation. The deviation of workpiece material was selected as the noise factor. The ANOVA analysis showed that the inlet angle had the most significant effect on optimum forged residual stresses. The feed rate and depth of cut had the most significant effect on machined residual stresses.

Download or read book International Conference on Residual Stresses written by G. Beck and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1043 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual stresses are always introduced in materials when they are produced, or when they undergo non-uniform plastic deformation during use. The circumstances that can cause residual stresses are therefore numerous. Residual stresses exist in all materials and, depending on their distribution, can playa beneficial role (for example, compressive surface stress) or have a catastrophic effect, especially on fatigue behaviour and corrosion properties. The subject of residual stresses took form around 1970 with the development of methods to measure macroscopic deformations during the machining of materials or on an atomic scale by X-ray diffraction. These techniques have made considerable progress in the last 20 years. The meetings organized in several countries (Germany, France, Japan, etc. ) have largely contributed to this progress, aided by the numerous exchanges of information and knowledge to which they have given rise. Studies of the formation of residual stresses began more slowly, but have progressed with the emergence of increasingly realistic models of materials behaviour and with access to ever more powerful codes for numerical calculations. Two successive meetings for discussing this topic have been held in Europe. The first, held in 1982 in Nancy (France), consisted of 30 participants from 5 countries. The second was held in Linkoping (Sweden) in 1984, with 80 participants of 16 nationalities. It was decided to hold a first International Conference, ICRS, to address all aspects of the problem. Held in 1986 in Garmisch-Partenkirschen (FRG), it was an assembly of neady 300 participants from 21 countries.

Download or read book Adaptive Layer Process Control of Laser Aided Direct Metal material Deposition Process written by Yusheng Hua and published by . This book was released on 2004 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: "It has been acknowledged that close-loop feedback control of laser aided direct metal/material deposition (DMD) process is critical to deliver this revolutionary rapid manufacturing technology into industry. The primary concern in applying the control technique is how precisely the deposition dimension can be achieved; however, the challenge to implement it comes from how to control the deposition height effectively. This research work investigates height control methods to achieve the dimensional precision, for typical cases such as uniform depsoition, adaptive, and non-uniform deposition, based on optical height sensing technology--Abstract, leaf iii.

Download or read book Residual Stresses 2018 written by Marc Seefeldt and published by Materials Research Forum LLC. This book was released on 2018-10-10 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: The European Conference on Residual Stresses (ECRS) series is the leading European forum for scientific exchange on internal and residual stresses in materials. It addresses both academic and industrial experts and covers a broad gamut of stress-related topics from instrumentation via experimental and modelling methodology up to stress problems in specific processes such as welding or shot-peening, and their impact on materials properties. Chapters: Diffraction Methods; Mechanical Relaxation Methods; Acoustic and Electromagnetic Methods; Composites, Nano and Microstructures; Films, Coatings and Oxides; Cold Working and Machining; Heat Treatments and Phase Transformations; Welding, Fatigue and Fracture: Stresses in Additive Manufacturing.

Download or read book Thermo Mechanical Modeling of Additive Manufacturing written by Michael Gouge and published by Butterworth-Heinemann. This book was released on 2017-08-03 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermo-mechanical Modeling of Additive Manufacturing provides the background, methodology and description of modeling techniques to enable the reader to perform their own accurate and reliable simulations of any additive process. Part I provides an in depth introduction to the fundamentals of additive manufacturing modeling, a description of adaptive mesh strategies, a thorough description of thermal losses and a discussion of residual stress and distortion. Part II applies the engineering fundamentals to direct energy deposition processes including laser cladding, LENS builds, large electron beam parts and an exploration of residual stress and deformation mitigation strategies. Part III concerns the thermo-mechanical modeling of powder bed processes with a description of the heat input model, classical thermo-mechanical modeling, and part scale modeling. The book serves as an essential reference for engineers and technicians in both industry and academia, performing both research and full-scale production. Additive manufacturing processes are revolutionizing production throughout industry. These technologies enable the cost-effective manufacture of small lot parts, rapid repair of damaged components and construction of previously impossible-to-produce geometries. However, the large thermal gradients inherent in these processes incur large residual stresses and mechanical distortion, which can push the finished component out of engineering tolerance. Costly trial-and-error methods are commonly used for failure mitigation. Finite element modeling provides a compelling alternative, allowing for the prediction of residual stresses and distortion, and thus a tool to investigate methods of failure mitigation prior to building. - Provides understanding of important components in the finite element modeling of additive manufacturing processes necessary to obtain accurate results - Offers a deeper understanding of how the thermal gradients inherent in additive manufacturing induce distortion and residual stresses, and how to mitigate these undesirable phenomena - Includes a set of strategies for the modeler to improve computational efficiency when simulating various additive manufacturing processes - Serves as an essential reference for engineers and technicians in both industry and academia

Download or read book Heat Effects of Welding written by Dieter Radaj and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost all welding technology depends upon the use of concentrated energy sources to fuse or soften the material locally at the joint, before such energy can be diffused or dispersed elsewhere. Although comprehensive treatments of transient heat flow as a controlling influence have been developed progressively and published over the past forty years, the task of uniting the results compactly within a textbook has become increasingly formidable. With the comparative scarcity of such works, welding engineers have been denied the full use of powerful design analysis tools. During the past decade Dr Radaj has prepared to fulfil this need, working from a rich experience as pioneer researcher and teacher, co-operator with Professor Argyris at Stuttgart University in developing the finite element method for stress analysis of aircraft and power plant structures, and more recently as expert consultant on these and automotive structures at Daimler Benz. His book appeared in 1988 in the German language, and this updated English language edition will significantly increase the availability of the work.