Download or read book Development of a Numerical Model of Single Particle Impact with Adhesion for Simulation of the Cold Spray Process written by Paul Profizi and published by . This book was released on 2019 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of the Cold Spray process, a numerical model of a single particle impact is developed. The point of interest is the adhesion of the particle to the substrate, thus an adhesive interaction model is also created. The impact model uses the Smooth Particle Hydrodynamics and/or the Finite Elements methods, with a Johnson-Cook material law, commonly used for metals at high strain rates, which takes into account strain hardening, strain rate hardening and thermal softening. The adhesive interaction is a Griffith and Dugdale-Barenblatt cohesive model with energy dissipation and a limit on the cohesive stress. Using this model it is shown that in the case of fast dynamics and deformable bodies, not only the adhesion parameters but also the type of model has an influence on the results. The adhesion model is also, contrary to previous works, linked with an actual physical mechanism known to induce adhesion in Cold Spray: a shear stress instability at the interface. This is done by adding an activation criterion to the cohesive model. This criterion is defined as a local drop in yield strength on either element in contact. Only when this criterion is locally met are the cohesive stresses applied and cohesive energy dissipated. The result is the apparition of a critical velocity, under which adhesion cannot occur due to either not enough initial kinetic energy to create an instability at the interface, or not enough adhesive surface created to keep the particle from rebounding. For the model to localize and undergo shear banding/shear instability, a damage value is added to the material law. An erosion criterion is then implemented in the cohesive model to remove the cohesive stresses from highly damaged parts of the adhesive surface. This results at high impact speeds in a maximal velocity above which the interfacial material is too damaged to sustain adhesion and prevent the particle from rebounding. A deposition behavior similar to the Cold Spray process is then observed, with a range of low velocities without any adhesion of the particle, then a critical speed initiating a velocity range of adhesion of the particle, and finally a maximum speed above which the interface is too damaged to sustain the adhesion. A set of experimental observations is also carried out to better understand the actual microstructural dynamics and changes at the interface of 1 mm copper particles impacted on copper. The results are compared to simulations and the use of the macroscopic Johnson-Cook law at a microscopic level is validated.
Download or read book Development of a Numerical Model of Single Particle Impact with Adhesion for Simulation of the Cold Spray Process written by Paul Profizi and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of the Cold Spray process, a numerical model of a single particle impact is developed. The point of interest is the adhesion of the particle to the substrate, thus an adhesive interaction model is also created. The impact model uses the Smooth Particle Hydrodynamics and/or the Finite Elements methods, with a Johnson-Cook material law, commonly used for metals at high strain rates, which takes into account strain hardening, strain rate hardening and thermal softening. The adhesive interaction is a Griffith and Dugdale-Barenblatt cohesive model with energy dissipation and a limit on the cohesive stress. Using this model it is shown that in the case of fast dynamics and deformable bodies, not only the adhesion parameters but also the type of model has an influence on the results. The adhesion model is also, contrary to previous works, linked with an actual physical mechanism known to induce adhesion in Cold Spray: a shear stress instability at the interface. This is done by adding an activation criterion to the cohesive model. This criterion is defined as a local drop in yield strength on either element in contact. Only when this criterion is locally met are the cohesive stresses applied and cohesive energy dissipated. The result is the apparition of a critical velocity, under which adhesion cannot occur due to either not enough initial kinetic energy to create an instability at the interface, or not enough adhesive surface created to keep the particle from rebounding. For the model to localize and undergo shear banding/shear instability, a damage value is added to the material law. An erosion criterion is then implemented in the cohesive model to remove the cohesive stresses from highly damaged parts of the adhesive surface. This results at high impact speeds in a maximal velocity above which the interfacial material is too damaged to sustain adhesion and prevent the particle from rebounding. A deposition behavior similar to the Cold Spray process is then observed, with a range of low velocities without any adhesion of the particle, then a critical speed initiating a velocity range of adhesion of the particle, and finally a maximum speed above which the interface is too damaged to sustain the adhesion. A set of experimental observations is also carried out to better understand the actual microstructural dynamics and changes at the interface of 1 mm copper particles impacted on copper. The results are compared to simulations and the use of the macroscopic Johnson-Cook law at a microscopic level is validated.
Download or read book Advances in Engineering Research and Application written by Duy Cuong Nguyen and published by Springer Nature. This book was released on with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cold Spray Technology written by Anatolii Papyrin and published by Elsevier. This book was released on 2006-10-04 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topic of this book is Cold Spray technology. Cold Spray is a process of applying coatings by exposing a metallic or dielectric substrate to a high velocity (300 to 1200 m/s) jet of small (1 to 50 μm) particles accelerated by a supersonic jet of compressed gas. This process is based on the selection of the combination of particle temperature, velocity, and size that allows spraying at the lowest temperature possible. In the Cold Spray process, powder particles are accelerated by the supersonic gas jet at a temperature that is always lower than the melting point of the material, resulting in coating formation from particles in the solid state. As a consequence, the deleterious effects of high-temperature oxidation, evaporation, melting, crystallization, residual stresses, gas release, and other common problems for traditional thermal spray methods are minimized or eliminated. This book is the first of its kind on the Cold Spray process. Cold Spray Technology covers a wide spectrum of various aspects of the Cold Spray technology, including gas-dynamics, physics of interaction of high-speed solid particles with a substrate as well as equipment, technologies, and applications. Cold Spray Technology includes the results of more than 20 years of original studies (1984-2005) conducted at the Institute of Theoretical and Applied Mechanics of the Siberian Division of the Russian Academy of Science, as well as the results of studies conducted at most of the research centres around the world. The authors' goal is threefold. The first goal is to explain basic principles and advantages of the Cold Spray process. The second goal is, to give practical information on technologies and equipment. The third goal is to present the current state of research and development in this field over the world. The book provides coverage and data that will be of interest for users of Cold Spray technology as well as for other coating experts. At the present time the Cold Spray method is recognized by world leading scientists and specialists. A wide spectrum of research is being conducted at many research centres and companies in many countries. New approach to spray coatings Results are exceptionally pure coatings Low spray temperature without degradation of powder and substrate materials High productivity, high deposition efficiency High operational safety because of absence of high temperature gas jets, radiation and explosive gases Excellent thermal and electrical conductivity Wide spectrum of applications because of important advantages of the process
Download or read book Cold Spray Coatings written by Pasquale Cavaliere and published by Springer. This book was released on 2017-11-08 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book combines the contributions of experts in the field to describe the behavior of various materials, micromechanisms involved during processing, and the optimization of cold-spray technology. It spans production, characterization, and applications including wear resistance, fatigue, life improvement, thermal barriers, crack repair, and biological applications. Cold spray is an innovative coating technology based on the kinetic energy gained by particles sprayed at very high pressures. While the technique was developed in the 1990s, industrial and scientific interest in this technology has grown vastly in the last ten years. Recently, many interesting applications have been associated with cold-sprayed coatings, including wear resistance, fatigue life improvement, thermal barriers, biological applications, and crack repair. However, many fundamental aspects require clarification and description.
Download or read book Numerical and Experimental Characterization of the Cold Spray Process for Spraying Nano Particle Powders written by Abdulaziz Alhulaifi and published by . This book was released on 2011 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cold spray deposition process involves the acceleration of solid particles to high velocity by a carrier gas which is often supersonic, and the subsequent impingement of this high velocity, particle laden jet onto a substrate. In order for deposition to occur, i.e. in order for the solid particles to bond to the substrate, the impact velocity of the particles must be equal to or greater than some critical value. To determine an estimate of this critical velocity, the energy principle was used to predict a critical impact velocity based on material properties. It has been shown that during its interaction with the substrate, a particle should reach around 70% of its melting temperature to obtain good mechanical bonding. Using computational fluid dynamic models (CFD), a novel Aerodynamic Focusing Nozzle (AFN) using helium as the carrier gas, was developed and experimentally tested. The CFD models showed that a lighter gas such a helium must be used for the nanoparticles to reach critical velocity and penetrate the normal shockwave upstream of the substrate with sufficient inertia. A prototype AFN nozzle was fabricated using a rapid prototype machine and used to cold spray 300 nm diameter particles onto both aluminum and Kapton substrates at room temperature. Additional validation of the feasibility of the design was obtained through the deposition of a thin conductive copper layer of Kapton. This research focuses on the numerical modeling, as well as the construction and experimentation required for the development of the AFN for cold spraying nanoparticles. To characterize the results in a general way, a non-dimensionalization of all the factors involved was conducted and validated to determine the combination of cold spray process parameters required for the particle to reach the critical impact velocity and temperature.
Download or read book Advances in Cold Spray written by Victor K. Champagne and published by Woodhead Publishing. This book was released on 2023-06-23 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Cold Spray: A Coating Deposition and Additive Manufacturing Process, Second Edition reviews the fundamental processes and recent advances made in the field of cold spray. This fully updated edition now includes a special chapter on Cold Spray Additive Manufacturing, along with advancements in impact modeling and simulation that allow a better understanding of the cold spray bonding mechanisms, powder synthesis and predictive modeling to improve the engineering of cold spray powders. In addition, materials properties data is a backbone of this book because the advanced cold spray materials have proven to be comparable to wrought and enable cold spray to be incorporated into structural applications for near-net shape parts production as well as for repair. Finally, numerous modern applications of cold spray representative of the Electronics, Medical, Petrochemical, Nuclear, Aerospace, Automotive, and Additive Manufacturing industries are presented. - Provides information on the fundamentals of cold spray as an additive manufacturing process - Presents the significant increase in properties of cold spray materials achieved to date - Discusses recent advancements in cold spray powders, equipment, automation, modeling and simulation and the expansion of applications
Download or read book Advanced Surface Enhancement written by Sho Itoh and published by Springer Nature. This book was released on 2019-08-30 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the proceedings of the first INCASE conference, organised by ARTC at A*STAR, Singapore. It provides a comprehensive review of recent advances in surface enhancement processes and strategies employed to assess their impact on materials properties and performance. As cyber-physical systems are becoming more and more relevant in manufacturing, it focuses on assessing the readiness of current technologies for future transformations, such as Industry 4.0, identifying the opportunities and challenges, and exploring ways to address them. Written by researchers, practising engineering and industry experts, the book bridges the gap between research and manufacturing, promoting technology adoption in industry and innovative ideas to prepare it for the future.
Download or read book Powder Consolidation Using Cold Spray written by Atieh Moridi and published by Springer. This book was released on 2016-11-10 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book first presents different approaches to modeling of the cold spray process with the aim of extending current understanding of its fundamental principles and then describes emerging applications of cold spray. In the coverage of modeling, careful attention is devoted to the assessment of critical and erosion velocities. In order to reveal the phenomenological characteristics of interface bonding, severe, localized plastic deformation and material jet formation are studied. Detailed consideration is also given to the effect of macroscopic defects such as interparticle boundaries and subsequent splat boundary cracking on the mechanical behavior of cold spray coatings. The discussion of applications focuses in particular on the repair of damaged parts and additive manufacturing in various disciplines from aerospace to biomedical engineering. Key aspects include a systematic study of defect shape and the ability of cold spray to fill the defect, examination of the fatigue behavior of coatings for structural applications, and a novel working window at subcritical conditions to obtain porous structures. This book is exceptional in scope, and its review of finite element modelling at different length scales sheds light on future design and process improvement in emerging applications such as structural repair, metal additive manufacturing and metal foam design.
Download or read book Materials Processing Fundamentals 2021 written by Jonghyun Lee and published by Springer Nature. This book was released on 2021-03-21 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers various aspects of the fundamentals, synthesis, analysis, design, monitoring, and control of metals, materials, and metallurgical processes and phenomena. Topics represented include but are not limited to: • Experimental, analytical, physical, and computer modeling of physical chemistry and thermodynamics • Modeling of the transport phenomena in materials processing and metallurgical processes involving iron, steel, nonferrous metals, and composites • Second-phase particles in metals and processes and the fundamentals (experimental studies or theoretical studies) on the nucleation, growth, motion, and removal of these particles from the molten metal or reactors • Physical chemistry, thermodynamics, and kinetics for the production and refining of rare-earth metals • Control of industrial processes in the field of extraction and processing of metals and materials
Download or read book CFD Modeling and Simulation in Materials Processing written by Laurentiu Nastac and published by John Wiley & Sons. This book was released on 2012-05-09 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a symposium sponsored by Association for Iron and Steel Technology and the Process Technology and Modeling Committee of the Extraction and Processing Division and the Solidification Committee of the Materials Processing and Manufacturing Division of TMS (The Minerals, Metals & Materials Society) Held during the TMS 2012 Annual Meeting & Exhibition Orlando, Florida, USA, March 11-15, 2012
Download or read book Practical Cold Spray written by Victor Kenneth Champagne Jr. and published by Springer Nature. This book was released on 2021-06-18 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a detailed explanation of the cold spray process from a practical standpoint. Drawing on the authors’ 36 years of research and development experience, it is firmly rooted in theory but also substantiated by empirical data and practical knowledge, offering potential users the information they need to recognize the advantages, as well as the limitations, of cold spray. This sets it apart from previous works on the subject, which have been purely academic. Cold spray technology has made great dramatic strides over the last 10 years and is now being used extensively in the aerospace, electronics, automotive, medical, and even the petrochemical industries. Most recently, cold spray of near-net shaped parts was accomplished – something previously assumed to be impossible because of the limitations of commercially available cold spray systems and a lack of fundamental understanding regarding the process. The cost of cold spray has also declined, making it appealing to industry through the introduction of new powders, surface preparation techniques, and recovery systems tailored to the cold spray process. Though primarily intended for users of the technology, this handbook is also a valuable resource for researchers interested in advances in cold spray materials, improved feedstock powders, advanced hardware and software development, surface preparation techniques, and the numerous applications developed to date. For example, cold spray aluminum alloys have been developed that offer the strength and ductility of wrought material in the as-sprayed condition. This has yet to be achieved by conventional powder consolidation methods including laser sintering, electron beam, and ultrasonic techniques. Other topics covered include additive manufacturing, structural repair, nondestructive evaluation, advanced cold spray materials, qualification requirements, cold spray systems comparison, and, finally, helium recovery. Thanks to its practical focus, the book provides readers with everything they need to understand, evaluate, and implement cold spray technology.
Download or read book Cold Gas Dynamic Spray written by Roman Gr. Maev and published by CRC Press. This book was released on 2016-04-27 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Your Guide to Advanced Cold Spray TechnologyCold Gas Dynamic Spray centers on cold gas dynamic spray (or cold spray-CS) technology, one of the most versatile thermal spray coating methods in materials engineering, and effectively describes and analyzes the main trends and developments behind the spray (coating) techniques. The book combines theory
Download or read book Numerical Modeling of the Cold Spray Process written by Qing Song Zhu and published by . This book was released on 2007 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis involves numerical modeling of several cold spray processes in order to predict the gas flow as well as the particle conditions upon impacting on a substrate. Particle normal velocity was found to be the most important factor to improve the deposition efficiency and coating quality. Particle velocity was calculated with both Lagrangian and Eulerian approaches. The Lagrangian approach was used to investigate the effect of particle size and substrate geometry in a dilute particle flow. The shape and strength of the bow shock formed near the substrate for different geometries (such as concave, convex, and flat) were studied. Consequently, the particle normal velocities impacting on the substrates located at various stand-off distances were calculated. Furthermore, the numerical simulations were repeated with particles of various sizes as well as different types of feeding gas. The results were compared to obtain the optimum substrate location and the appropriate particle size for each feeding gas. The numerical results were validated against the experimental results for the majority of the process parameters including the gas Mach number and mean particle velocity. The Eulerian approach was also implemented to model dense particulate flows. It was found that a dense particulate flow could significantly decelerate the gas flow and consequently result in small particle velocity.
Download or read book Material Behavior During High Velocity Impacts Novel Numerical Approaches written by Saeed Rahmati and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of material behavior and its microstructural evolution during high velocity impacts has been investigated for decades. The application of this topic can be observed in various engineering applications such as the cold spray process. Cold spray (CS) is an additive manufacturing method in which solid particles are accelerated using a low temperature supersonic inert gas flow, prior to their impact onto a substrate and adhesion/consolidation. In this process, unlike other thermal spray processes, the particles are kept well below their melting point prior to impact. This allows the CS process to be used for the manufacturing of high quality, specialized products at a low energy input. In CS, the deformation and bonding processes happen in a very short time (less than 100 ns). With the current technology, in-situ investigation is almost impossible. In this situation, numerical modeling methods are the best alternative to study the deposition process. There are several factors influencing the particle deposition, such as particle/substrate material properties, particle size, material temperature, particle velocity and so on, but it has been shown that the particle impact velocity has the major role during the deposition process. In fact, despite the type of bonding, i.e., mechanical or chemical, particle is sticking to the substrate after experiencing severe plastic deformation that occurs upon the impact at high velocities. Therefore, in order to develop the understating of the CS process, investigating the deformation behavior of material during high velocity impacts, and also bonding mechanisms involved during particle deposition must be investigated. III Although numerous studies have been done to explore the mechanisms occurring during particle deposition, the details of this process are still unclear. Therefore, the purpose of this research is to study the fundamental aspects of material behavior during the deformation and deposition processes with the aim of improving the understating of the CS process. Two different numerical approaches will be used to achieve the objective of the study, i.e., Finite Element Method (FEM) and Molecular Dynamics (MD) method. FEM will be used to study the metallic bonding occurring between the particle and the substrate. A physically based model to predict this phenomenon will be implemented into ABAQUS/Explicit FEM software. MD simulations will be performed to investigate the microstructure evolution during high velocity impacts. In order to characterize the deformation behavior of materials at a fundamental level, analysis will be focused on the basic mechanisms of plasticity and hardening in metals, i.e., the multiplication, glide and locking of dislocations, and also solid-state amorphization that happens at high strain rate deformations.
Download or read book Future Development of Thermal Spray Coatings written by Nuria Espallargas and published by Elsevier. This book was released on 2015-06-29 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Future Development of Thermal Spray Coatings discusses the latest developments and research trends in the thermal spray industry. The book presents a timely guide to new applications and techniques. After an introduction to thermal spray coatings by the editor, Part One covers new types and properties of thermal spray coatings. Chapters look at feedstock suspensions and solutions, the application of solution precursor spray techniques to obtain ceramic films and coatings, cold spray techniques and warm spray technology amongst others. Part Two of the book moves on to discuss new applications for thermal spray coatings such as the use of thermal spray coatings in environmental barrier coatings, thermal spray coatings in renewable energy applications and manufacturing engineering in thermal spray technologies by advanced robot systems and process kinematics. - Timely guide on the current advancements and research trends in thermal spray technology - Reviews different types of thermal spray coatings - Presents a wide variety of applications for this emerging technology
Download or read book Advanced Surface Coating Techniques for Modern Industrial Applications written by Roy, Supriyo and published by IGI Global. This book was released on 2020-09-18 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: In engineering, there are often situations in which the material of the main component is unable to sustain long life or protect itself from adverse operating environments. Moreover, in some cases, different material properties such as anti-friction and wear, anti-corrosive, thermal resistive, super hydrophobic, etc. are required as per the operating conditions. If those bulk components are made of such materials and possess those properties, the cost will be very high. In such cases, a practical solution is surface coating, which serves as a protective barrier to the bulk material from the adverse environment. In the last decade, with enormous effort, researchers and scientists have developed suitable materials to overcome those unfavorable operating conditions, and they have used advanced deposition techniques to enhance the adhesion and surface texturing of the coatings. Advanced Surface Coating Techniques for Modern Industrial Applications is a highly sought reference source that compiles the recent research trends in these new and emerging surface coating materials, deposition techniques, properties of coated materials, and their applications in various engineering and industrial fields. The book particularly focuses on 1) coating materials including anti-corrosive materials and nanomaterials, 2) coating methods including thermal spray and electroless disposition, and 3) applications such as surface engineering and thin film application. The book is ideal for engineers, scientists, researchers, academicians, and students working in fields like material science, mechanical engineering, tribology, chemical and corrosion science, bio-medical engineering, biomaterials, and aerospace engineering.
