Relevant bibliographies by topics / Enhancement additive manufacturing

Academic literature on the topic 'Enhancement additive manufacturing'

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Published: 14 March 2023

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Journal articles on the topic "Enhancement additive manufacturing"

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Näsström, Jonas, Frank Brueckner, and Alexander F. H. Kaplan. "Laser enhancement of wire arc additive manufacturing." Journal of Laser Applications 31, no. 2 (May 2019): 022307. http://dx.doi.org/10.2351/1.5096111.

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Bonavolontà, Francesco, Edoardo Campoluongo, Annalisa Liccardo, and Rosario Schiano Lo Moriello. "Performance Enhancement of Rogowski Coil Through an Additive Manufacturing Approach." International Review of Electrical Engineering (IREE) 14, no. 3 (June 30, 2019): 148. http://dx.doi.org/10.15866/iree.v14i3.17606.

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Touzé, S., M. Rauch, and J. Y. Hascoët. "Flowability characterization and enhancement of aluminium powders for additive manufacturing." Additive Manufacturing 36 (December 2020): 101462. http://dx.doi.org/10.1016/j.addma.2020.101462.

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Gu, Dongdong, Xinyu Shi, Reinhart Poprawe, David L. Bourell, Rossitza Setchi, and Jihong Zhu. "Material-structure-performance integrated laser-metal additive manufacturing." Science 372, no. 6545 (May 27, 2021): eabg1487. http://dx.doi.org/10.1126/science.abg1487.

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Laser-metal additive manufacturing capabilities have advanced from single-material printing to multimaterial/multifunctional design and manufacturing. Material-structure-performance integrated additive manufacturing (MSPI-AM) represents a path toward the integral manufacturing of end-use components with innovative structures and multimaterial layouts to meet the increasing demand from industries such as aviation, aerospace, automobile manufacturing, and energy production. We highlight two methodological ideas for MSPI-AM—“the right materials printed in the right positions” and “unique structures printed for unique functions”—to realize major improvements in performance and function. We establish how cross-scale mechanisms to coordinate nano/microscale material development, mesoscale process monitoring, and macroscale structure and performance control can be used proactively to achieve high performance with multifunctionality. MSPI-AM exemplifies the revolution of design and manufacturing strategies for AM and its technological enhancement and sustainable development.
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Srinivasan, Naveen Raj, J. Chamala Vaishnavi, BL Varun Darshan, D. Srajaysikhar, G. Sakthivel, and N. Raghukiran. "Enhancement of an electric drill body using design for additive manufacturing." Journal of Physics: Conference Series 1969, no. 1 (July 1, 2021): 012025. http://dx.doi.org/10.1088/1742-6596/1969/1/012025.

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Andrew, J. Jefferson, Jabir Ubaid, Farrukh Hafeez, Andreas Schiffer, and S. Kumar. "Impact performance enhancement of honeycombs through additive manufacturing-enabled geometrical tailoring." International Journal of Impact Engineering 134 (December 2019): 103360. http://dx.doi.org/10.1016/j.ijimpeng.2019.103360.

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Demadis, Konstantinos D., Maria Somara, and Eleftheria Mavredaki. "Additive-Driven Dissolution Enhancement of Colloidal Silica. 3. Fluorine-Containing Additives." Industrial & Engineering Chemistry Research 51, no. 7 (February 2, 2012): 2952–62. http://dx.doi.org/10.1021/ie202806m.

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Wang, Xiuhu. "Research Progress and Current Situation of Laser Additive Technology." Academic Journal of Science and Technology 2, no. 1 (July 21, 2022): 186–88. http://dx.doi.org/10.54097/ajst.v2i1.984.

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Laser additive technology additive manufacturing is a manufacturing method that realizes the combination of precise "shape control" of complex structure and high-performance "controllability". After rapid solidification, it forms a surface coating or matrix structure with very low dilution. Such surface coating or structure can effectively combine metallurgical technology, and can improve the wear resistance, corrosion resistance, heat resistance, oxidation resistance and other properties of the surface of the matrix material, or in manufacturing. At present, laser additive manufacturing is widely used in aerospace and military industry for rapid repair and performance enhancement of parts. In terms of metals, selective laser melting (SLM) and laser melting deposition (LCD) processes are mainly represented.
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Xu, Zhenlin, Hui Zhang, Xiaojie Du, Yizhu He, Hong Luo, Guangsheng Song, Li Mao, Tingwei Zhou, and Lianglong Wang. "Corrosion resistance enhancement of CoCrFeMnNi high-entropy alloy fabricated by additive manufacturing." Corrosion Science 177 (December 2020): 108954. http://dx.doi.org/10.1016/j.corsci.2020.108954.

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Kovacev, Nikolina, Sheng Li, Weining Li, Soheil Zeraati-Rezaei, Athanasios Tsolakis, and Khamis Essa. "Additive Manufacturing of Novel Hybrid Monolithic Ceramic Substrates." Aerospace 9, no. 5 (May 7, 2022): 255. http://dx.doi.org/10.3390/aerospace9050255.

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Additive manufacturing (AM) can revolutionise engineering by taking advantage of unconstrained design and overcoming the limitations of traditional manufacturing capabilities. A promising application of AM is in catalyst substrate manufacturing, aimed at the enhancement of the catalytic efficiency and reduction in the volume and weight of the catalytic reactors in the exhaust gas aftertreatment systems. This work addresses the design and fabrication of innovative, hybrid monolithic ceramic substrates using AM technology based on Digital Light Processing (DLP). The designs are based on two individual substrates integrated into a single, dual-substrate monolith by various interlocking systems. These novel dual-substrate monoliths lay the foundation for the potential reduction in the complexity and expense of the aftertreatment system. Several examples of interlocking systems for dual substrates were designed, manufactured and thermally post-processed to illustrate the viability and versatility of the DLP manufacturing process. Based on the findings, the sintered parts displayed anisotropic sintering shrinkage of approximately 14% in the X–Y direction and 19% in the Z direction, with a sintered density of 97.88 ± 0.01%. Finally, mechanical tests revealed the mechanical integrity of the designed interlocks. U-lock and Thread configurations were found to sustain more load until complete failure.
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Dissertations / Theses on the topic "Enhancement additive manufacturing"

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Wei, William Lien Chin. "New Studies on Thermal Transport in Metal Additive Manufacturing Processes and Products." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1057.

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Additive manufacturing (AM) is a manufacturing technique that adds material, such as polymers, ceramics, and metals, in patterned layers to build three-dimensional parts for applications related to medicine, aviation, and energy. AM processes for metals like selective laser melting (SLM) hold the unique advantage of fabricating metal parts with complex architectures that cannot be produced by conventional manufacturing techniques. Thermal transport can be a focal point of unique AM products and is likewise important to metal AM processes. This dissertation investigates AM metal meshes with spatially varied thermal conductivities that can be used to maximize the charge and discharge rates for thermal energy storage and thermal management by phase change materials (PCMs). Further, manufacturing these meshes demands excellent thermal control in the metal powder bed for SLM processes. Since the thermal conductivities of metal powders specific to AM were previously unknown, we made pioneering measurements of such powders as a function of gas infiltration. In the past, thermal transport was improved in phase change materials for energy storage by adding spatially homogeneous metal foams or particles into PCMs to create composites with uniformly-enhanced (UE) thermal conductivity. Spatial variation can now be realized due to the emergence of metal AM processes whereby graded AM meshes are inserted into PCMs to create PCM composites with spatially-enhanced (SE) thermal conductivity. As yet, there have been no studies on what kind of spatial variation in thermal conductivity can further improve charge and discharge rates of the PCM. Making such mesh structures, which exhibit unsupported overhangs that limit heat dissipation pathways during SLM processes, demands understanding of heat diffusion within the surrounding powder bed. This inevitably relies on the precise knowledge of the thermal conductivity of AM metal powders. Currently, no measurements of thermal conductivity of AM powders have been made for the SLM process. In chapter 2 and 3, we pioneer and optimize the spatial variation of metal meshes to maximize charge and discharge rates in PCMs. Chapter 2 defines and analytically determines an enhancement ratio of charge rates using spatially-linear thermal conductivities in Cartesian and cylindrical coordinates with a focus on thermal energy storage. Chapter 3 further generalizes thermal conductivity as a polynomial function in space and numerically optimizes the enhancement ratio in spherical coordinates with a focus on thermal management of electronics. Both of our studies find that higher thermal conductivities of SE composites near to the heat source outperform those of UE composites. For selected spherical systems, the enhancement ratio reaches more than 800% relative to existing uniform foams. In chapter 4, the thermal conductivities of five metal powders for the SLM process were measured using the transient hot wire method. These measurements were conducted with three infiltrating gases (He, N2, and Ar) within a temperature range of 295-470 K and a gas pressure range of 1.4-101 kPa. Our measurements indicate that the pressure and the composition of the gas have a significant influence on the effective thermal conductivity of the powder. We find that infiltration with He provides more than 300% enhancement in powder thermal conductivity, relative to conventional infiltrating gases N2 and Ar. We anticipate that this use of He will result in better thermal control of the powder bed and thus will improve surface quality in overhanging structures.
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Li, Jiaqi. "Study of Nano-Transfer Technology for Additive Nanomanufacturing and Surface Enhanced Raman Scattering." University of Dayton / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1628006052402601.

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VENTOLA, LUIGI. "High-efficiency heat transfer devices by innovative manufacturing techniques." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2644177.

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In the present thesis, novel methods devoted to develop high heat transfer efficiency devices have been presented. These methods rely on both novel manufacturing techniques, belonging to the class of additive manufacturing (AM), and thermal and fluid-dynamics studies and optimization procedures. As a first result, optimization of a traditional heat exchanger from a real application, i.e. million of units produced per year, is presented; That is manufactured by extrusion. A thermal fluid-dynamic model is experimentally validated (from an industrial experimental test rig) and used for optimization purposes. Results demonstrate there is room for efficiency optimization even in well established heat transfer devices configurations based on traditional manufacturing techniques. Then, an experimental rig for ''in house'' thermal characterization is designed. It guarantees high precision measurement of small convective heat fluxes (forced air) on enhanced solutions investigated hereinafter, namely micro-structured surfaces and small heat transfer devices. To deal with that challenge, an innovative convective heat flux sensor is developed. That exploits the concept of thermal guard to avoid any spurious perturbation between the flow field and investigated surfaces, while it allows to cancel out terms due to spreading conduction phenomenon. Results demonstrate remarkable accuracy in direct measurement of convective heat fluxes through this novel concept. Relying on the proposed experimental rig, various methods for enhanced convective heat transfer are experimentally investigated. Firstly, regular patterns of micro-protrusions are studied. Effect of fluid-dynamics and geometrical length on heat transfer performances are discussed. More important, they have been applied to develop an optimization procedure tailored to deal with AM techniques. Results from both experimental investigation and optimization procedure suggest the existence of an optimal value of protrusion height, that maximize performance-to-cost ratio for patterns made by AM. Then, surface roughness of components built by DMLS has been investigated as an augmentation heat transfer technique. Surface roughness is controlled varying DMLS process parameters and its effect on convective heat transfer is measured. The results demonstrate a remarkable enhancement in convective heat transfer due to DMLS artificial roughness, in the investigated configurations. That preliminary study unveils the potential of AM artificial roughness as an heat transfer enhancement techniques. It has been considered, by academic and industrial institutions, as an important step towards development of next generation gas turbine components and electronic cooling devices. Finally, extreme flexibility in shape of parts built by DMLS is exploited to design and fabricate in one step an unconventional heat transfer device, called Pitot heat exchanger. Enhanced heat transfer efficiency is achieved, with regard to standard heat exchangers. Nevertheless, the most important achievement has been to highlight unusual morphologies allowed by AM can pave the way to revolutionary changes in conceiving and designing heat transfer components.
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Sidhu, Kuldeep S. "Residual Stress Enhancement of Additively Manufactured Inconel 718 by Laser Shock Peening and Ultrasonic Nano-crystal Surface Modification." University of Cincinnati / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1535464760914267.

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Imbrogno, Stano, Franco Furgiuele, and Domenico Umbrello. "Surface Integrity enhancement of aerospace components produced by subtractive and additive manufacturing processes." Thesis, 2018. http://hdl.handle.net/10955/1812.

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"Study Thermal Property of Stereolithography 3D Printed Multiwalled Carbon Nanotubes Filled Polymer Nanocomposite." Master's thesis, 2020. http://hdl.handle.net/2286/R.I.62966.

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abstract: Traditionally, for applications that require heat transfer (e.g. heat exchangers),metals have been the go-to material for manufacturers because of their high thermal as well as structural properties. However, metals have some notable drawbacks. They are not corrosion-resistant, offer no freedom of design, have a high cost of production, and sourcing the material itself. Even though polymers on their own don’t show great prospects in the field of thermal applications, their composites perform better than their counterparts. Nanofillers, when added to a polymer matrix not only increase their structural strength but also their thermal performance. This work aims to tackle two of those problems by using the additive manufacturing method, stereolithography to solve the problem of design freedom, and the use of polymer nanocomposite material for corrosion-resistance and increase their overall thermal performance. In this work, three different concentrations of polymer composite materials were studied: 0.25 wt%, 0.5 wt%, and 1wt% for their thermal conductivity. The samples were prepared by magnetically stirring them for a period of 10 to 24 hours depending on their concentrations and then sonicating in an ice bath further for a period of 2 to 3 hours. These samples were then tested for their thermal conductivities using a Hot Disk TPS 2500S. Scanning Electron Microscope (SEM) to study the dispersion of the nanoparticles in the matrix. Different theoretical models were studied and used to compare experimental data to the predicted values of effective thermal conductivity. An increase of 7.9 % in thermal conductivity of the composite material was recorded for just 1 wt% addition of multiwalled carbon nanotubes (MWCNTs).
Dissertation/Thesis
Masters Thesis Mechanical Engineering 2020
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(9187607), Jin Cui. "COMPLIANT MICROSTRUCTURES FOR ENHANCED THERMAL CONDUCTANCE ACROSS INTERFACES." Thesis, 2020.

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With the extreme increases in power density of electronic devices, the contact thermal resistance imposed at interfaces between mating solids becomes a major challenge in thermal management. This contact thermal resistance is mainly caused by micro-scale surface asperities (roughness) and wavy profile of surface (nonflatness) which severely reduce the contact area available for heat conduction. High contact pressures (1~100 MPa) can be used to deform the surface asperities to increase contact area. Besides, a variety of conventional thermal interface materials (TIM), such as greases and pastes, are used to improve the contact thermal conductance by filling the remaining air gaps. However, there are still some applications where such TIMs are disallowed for reworkability concerns. For example, heat must be transferred across dry interfaces to a heat sink in pluggable opto-electronic transceivers which needs to repeatedly slide into / out of contact with the heat sink. Dry contact and low contact pressures are required for this sliding application.

This dissertation presents a metallized micro-spring array as a surface coating to enhance dry contact thermal conductance under ultra-low interfacial contact pressure. The shape of the micro-springs is designed to be mechanically compliant to achieve conformal contact between nonflat surfaces. The polymer scaffolds of the micro-structured TIMs are fabricated by using a custom projection micro-stereolithography (μSL) system. By applying the projection scheme, this method is more cost-effective and high-throughput than other 3D micro-fabrication methods using a scanning scheme. The thermal conductance of polymer micro-springs is further enhanced by metallization using plating and surface polishing on their top surfaces. The measured mechanical compliance of TIMs indicates that they can deform ~10s μm under ~10s kPa contact pressures over their footprint area, which is large enough to accommodate most of surface nonflatness of electronic packages. The measured thermal resistances of the TIM at different fabrication stages confirms the enhanced thermal conductance by applying metallization and surface polishing. Thermal resistances of the TIMs are compared to direct metal-to-metal contact thermal resistance for flat and nonflat mating surfaces, which confirms that the TIM outperforms direct contact. A thin layer of soft polymer is coated on the top surfaces of the TIMs to accommodate surface roughness that has a smaller spatial period than the micro-springs. For rough surfaces, the polymer-coated TIM has reduced thermal resistance which is comparable to a benchmark case where the top surfaces of the TIM are glued to the mating surface. A polymer base is designed under the micro-spring array which can provide the advantages for handling as a standalone material or integration convenience, at the toll of an increased insertion resistance. Through-holes are designed in the base layer and coated with thermally conductive metal after metallization to enhance thermal conductance of the base layer; a thin layer of epoxy is applied between the base layer and the working surface to reduce contact thermal resistance exposed on the base layer. Cycling tests are conducted on the TIMs; the results show good early-stage reliability of the TIM under normal pressure, sliding contact, and temperature cycles. The TIM is thermally demonstrated on a pluggable application, namely, a CFP4 module, which shows enhanced thermal conductance by applying the TIM.

To further enhance the potential mechanical compliance of microstructured surfaces, a stable double curved beam structure with near-zero stiffness composed of intrinsic negative and positive stiffness elastic elements is designed and fabricated by introducing residual stresses. Stiffness measurements shows that the positive-stiffness single curved beam, which is the same as the top beam in the double curved beam, is stiffer than the double curved beam, which confirms the negative stiffness of the bottom beam in the double curved beam. Layered near zero-stiffness materials made of these structures are built to demonstrate the scalability of the zero-stiffness zone.
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Books on the topic "Enhancement additive manufacturing"

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International Conference on Gears 2022. VDI Verlag, 2022. http://dx.doi.org/10.51202/9783181023891.

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Foreword Gears bear great responsibility in present times, where the conditions for mechanical engineering and especially for drive technology are changing faster than ever. Megatrends, such as circular economy, decarbonization, green pressure, digitalization, zero waste and several more represent global challenges - but at the same time they are unforeseen opportunities for drives in industry, energy generation and mobility. Gear engineers must find answers to these research questions and provide solutions. Topics like gear efficiency improvements, performance enhancement of plastic gears, new measurement methods and additive manufacturing are in the focus of the VDI International Conference on Gears 2022 in Garching / Munich. One interesting question is, if we can anticipate break-through innovations to address the challenges above. The opening session of the conference addresses this very question: “What will be the next game-changing innovations and technologies in gear design and production?”. In the main part of the conference within 40 specialized sessions the latest developments and research results in powertrain industry and academic research are presented and discu...
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Book chapters on the topic "Enhancement additive manufacturing"

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Chandrashekar, Arjun C., Sreekanth Vasudev Nagar, and K. Guruprasad. "A Skill Enhancement Virtual Training Model for Additive Manufacturing Technologies." In Lecture Notes in Networks and Systems, 532–43. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23162-0_48.

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Koneri, Raghavendra, Sanket Mulye, Karthik Ananthakrishna, Rakesh Hota, Brajamohan Khatei, and Srikanth Bontha. "Additive Manufacturing of Lattice Structures for Heat Transfer Enhancement in Pipe Flow." In Lecture Notes in Mechanical Engineering, 233–46. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5689-0_21.

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Łabowska, Magdalena B., Ewa I. Borowska, Patrycja Szymczyk-Ziółkowska, Izabela Michalak, and Jerzy Detyna. "Hydrogel Based on Alginate as an Ink in Additive Manufacturing Technology—Processing Methods and Printability Enhancement." In New Horizons for Industry 4.0 in Modern Business, 209–32. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-20443-2_10.

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Amuda, Muhammed Olawale Hakeem, and Esther Titilayo Akinlabi. "Trend and Development in Laser Surface Modification for Enhanced Materials Properties." In Additive Manufacturing, 271–95. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9624-0.ch011.

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This article presents a process review of the commonly available laser surface modification techniques for surface property enhancement. This is reinforced with the specific case treatment of research trends in relation to commonly treated materials. The progression from simple surface modification to the production of components with multifunctional characteristics known as functionally graded material is discussed in combination with emerging research focus on the computational simulation of laser surface modification for optimization of process dynamics.
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Erinosho, Mutiu F., Esther T. Akinlabi, and Sisa Pityana. "Enhancement of Surface Integrity of Titanium Alloy With Copper by Means of Laser Metal Deposition Process." In Additive Manufacturing, 245–70. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-5225-9624-0.ch010.

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The laser metal deposition process possesses the combination of metallic powder and laser beam respectively. However, these combinations create an adhesive bonding that permanently solidifies the laser-enhanced-deposited powders. Titanium alloys (Ti6Al4V) Grade 5 have been regarded as the most used alloys for the aerospace applications, due to their lightweight properties and marine application due to their excellent corrosion resistance. The improvements in the surface integrity of the alloy have been achieved successively with the addition of Cu through the use of Ytterbium laser system powered at maximum of 2000 Watts. The motivation for this research work can be attributed to the dilapidation of the surface of titanium alloy, when exposed to marine or sea water for a longer period of time. This chapter provides the surface modification of titanium alloy with the addition of percentage range of Cu within its lattices; and the results obtained from the characterizations conducted on the laser deposited Ti6Al4V/Cu alloys have been improved.
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Gajakosh, Amithkumar, R. Suresh Kumar, V. Mohanavel, Ragavanantham Shanmugam, and Monsuru Ramoni. "Application of Machine Learning Techniques in Additive Manufacturing: A Review." In Applications of Artificial Intelligence in Additive Manufacturing, 1–24. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-8516-0.ch001.

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This chapter provides an analysis of the state-of-the-art in ML applications for optimizing the additive manufacturing process. This chapter primarily presents a review of the literature on the use of machine learning (ML) in optimizing the additive manufacturing process at various stages. The chapter identifies ML-researched areas in which ML can be used to optimize processes such as process design, process plan and control, process monitoring, quality enhancement of additively manufactured products, and so on. In addition, general literature on the intersection of additive manufacturing and machine learning will be presented. The benefits and drawbacks of ML for additive manufacturing will be discussed, as well as existing obstacles that are currently limiting applications.
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Kubade, Pravin R., Hrushikesh B. Kulkarni, and Vinayak C. Gavali. "Property Enhancement of Carbon Fiber-Reinforced Polylactic Acid Composites Prepared by Fused-Deposition Modeling." In Advances in Computer and Electrical Engineering, 455–78. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0117-7.ch017.

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Additive Manufacturing or three-dimensional printing refers to a process of building lighter, stronger three-dimensional parts, manufactured layer by layer. Additive manufacturing uses a computer and CAD software which passes the program to the printer to build the desired shape. Metals, thermoplastic polymers, and ceramics are the preferred materials used for additive manufacturing. Fused deposition modeling is one additive manufacturing technique involving the use of thermoplastic polymer for creating desired shape. Carbon fibers can be added into polymer to strengthen the composite without adding additional weight. Present work deals with the manufacturing of Carbon fiber-reinforced Polylactic Acid composites prepared using fused deposition modeling. Mechanical and thermo-mechanical properties of composites are studied as per ASTM standards and using sophisticated instruments. It is observed that there is enhancement in thermo-mechanical properties of composites due to addition reinforcement which is discussed in detail.
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Bhuyan, Dheeman. "Design of Prosthetic Heart Valve and Application of Additive Manufacturing." In Research Anthology on Emerging Technologies and Ethical Implications in Human Enhancement, 482–91. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8050-9.ch024.

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Heart valve prostheses are well known and can be classified in two major types or categories: biological and mechanical. Biological valves (i.e., Homografts and Heterografts) make use of animal tissue as the valving mechanism whereas mechanical valves make use of balls, disks, and other mechanical valving mechanism. Mechanical valves carry considerable risk and require lifelong medication. The design of these valves is usually done on a “one size fits all” basis, with only the diameter changing depending on the model being produced. The author seeks to present an application of additive manufacturing in the design process for mechanical valves. This is expected to provide patients with customized prostheses to match their physiology and reduce the risk associated with the implantation.
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Kaushik, Brahmansh, and S. Anand Kumar. "Computer vision based online monitoring technique: part quality enhancement in the selective laser melting process." In Advances in Additive Manufacturing Artificial Intelligence, Nature-Inspired, and Biomanufacturing, 167–94. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-91834-3.00007-7.

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Barua, Ranjit, Sudipto Datta, Amit Roychowdhury, and Pallab Datta. "Importance of 3D Printing Technology in Medical Fields." In Research Anthology on Emerging Technologies and Ethical Implications in Human Enhancement, 704–17. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8050-9.ch036.

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Three-dimensional or 3D printing technology is a growing interest in medical fields like tissue engineering, dental, drug delivery, prosthetics, and implants. It is also known as the additive manufacturing (AM) process because the objects are done by extruding or depositing the material layer by layer, and the material may be like biomaterials, plastics, living cells, or powder ceramics. Specially in the medical field, this new technology has importance rewards in contrast with conventional technologies, such as the capability to fabricate patient-explicit difficult components, desire scaffolds for tissue engineering, and proper material consumption. In this chapter, different types of additive manufacturing (AM) techniques are described that are applied in the medical field, especially in community health and precision medicine.
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Conference papers on the topic "Enhancement additive manufacturing"

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Kulkarni, Anup, Vivek C. Peddiraju, Subhradeep Chatterjee, and Dheepa Srinivasan. "Effect of Build Geometry and Porosity in Additively Manufactured CuCrZr." In 2022 International Additive Manufacturing Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/iam2022-93986.

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Abstract The current work presents an understanding of microstructure and mechanical properties as a function of build geometry and build orientation in Cu-Cr-Zr via the laser powder bed fusion (LPBF) technique. Porosity, microstructure, and mechanical properties have been compared in the as-printed (AP) and heat treated (HT) LPBF Cu-Cr-Zr, between cylindrical and cube geometries, along the longitudinal (L) and transverse (T) build orientations. Varying porosity levels were observed that yielded parts with 96–97% relative density in the AP condition. The AP microstructure, characterized by a combination of optical and electron microscopic techniques, demonstrated a hierarchical microstructure, comprising of grains (2.5–100 μm) with a cellular substructure (400–850 nm) and intracellular nanoscale (20–60 nm) precipitates enriched in Cu and Zr. Unlike most materials in the AP condition, crystallographic texture was found to be absent; however, very distinct river like patterns highlighted a novel characteristic of the LPBF Cu-Cr-Zr. Upon solutionizing and aging, Cr precipitates were seen heterogeneously nucleating along cell boundaries (0.5–1.3 μm), causing up to 45% enhancement in the strength and a 4–5% lower ductility. The yield strength along the transverse orientation was 10–16% higher than that of longitudinal orientation, in both the AP and HT conditions. Fracture surface of the tensile samples exhibited micro-voids and cleavage facets and unmelted particles. In spite of the observed defects, the overall mechanical properties matched well with those obtained in nearly dense (> 99%) samples and the mechanical property debit was less than 10%.
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Billings, Christopher, Zahed Siddique, and Yingtao Liu. "Enhancement of Mechanical Engineering Education With Additive Manufacturing Projects." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24568.

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Abstract This paper presents an undergraduate research project developed to enhance mechanical engineering education at the University of Oklahoma. Selective Laser Sintering (SLS) is a promising additive manufacturing method for high-temperature materials with high spatial resolution and surface quality. As one of the most capable engineering-grade thermoplastics, polyether ketone (PEEK) can be used in additive manufacturing due to its elevated working temperature. This printer will use multiple heat zones, adjustable layer height, and a controlled hopper system to allow the user to fine-tune every print. In this paper, students are required to analyze the technical challenges of SLS based 3D printing technology. Using three separate controlled heat zones, the user will be able to hold the part above its glass transition temperature until the entire part finishes, therefore, annealing it in the process. This will additionally allow for testing and documentation of the effect of heat during preheating, pre-sintering, and post sintering. These features in a small-scale machine will allow thorough documentation of how controlled heated environments can alter the physical properties of a 3D printed part. Using a full steel platform with CNC machined parts and an off the shelf laser, the cost will be reduced to under ten thousand dollars. This undergraduate project to design an SLS based 3D printer provide a unique opportunity for students to fully understand the challenges of SLS manufacturing and gain experience in developing a complex 3D printing system.
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Wong, Kin Keong, Kai Choong Leong, and S. B. Tor. "HEAT TRANSFER ENHANCEMENT OF SURFACES FOR POOL BOILING USING ADDITIVE MANUFACTURING." In First Thermal and Fluids Engineering Summer Conference. Connecticut: Begellhouse, 2016. http://dx.doi.org/10.1615/tfesc1.hte.012717.

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Stafford, Gabriel J., Stephen T. McClain, David R. Hanson, Robert F. Kunz, and Karen A. Thole. "Convection in Scaled Turbine Internal Cooling Passages With Additive Manufacturing Roughness." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59684.

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Abstract Additive manufacturing processes, such as direct metal laser sintering (DMLS), enable creation of novel turbine cooling internal passages and systems. However, the DMLS method produces a significant and unique surface roughness. Previous work in scaled passages analyzed pressure losses and friction factors associated with the rough surfaces, as well as investigated the velocity profiles and turbulent flow characteristics within the passage. In this study, the heat transfer characteristics of scaled additively manufactured surfaces were measured using infrared (IR) thermography. Roughness panels were CNC machined from plates of aluminum 6061 to create near isothermal roughness elements when heated. Fluid resistance differences between the aluminum roughness panels and roughness panels constructed from ABS plastic using the same roughness patterns from McClain et al. (2020) were investigated. Finally, the overall thermal performance enhancements and friction losses were assessed through calculation of surface averaged “global thermal performance” ratios. The global thermal performance characterizations indicate results in-line with those found for traditional commercial roughness and slightly below traditional internal passage convection enhancement methods such as swirl chambers, dimples, and ribs. The passages investigated in this study do not include compressibility effects or the long-wavelength artifacts and channel geometric deviations observed by Wildgoose et al. (2020). However, the results of this study indicate that, based on the roughness augmentation alone, artificial convective cooling enhancers such as turbulators or dimples may still be required for additively manufactured turbine component cooling.
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Harding, Kevin G. "Structured light as an enhancement tool for low contrast features in additive manufacturing." In Dimensional Optical Metrology and Inspection for Practical Applications VII, edited by Song Zhang and Kevin G. Harding. SPIE, 2018. http://dx.doi.org/10.1117/12.2302882.

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Nawafleh, Nashat, and Emrah Celik. "Direct Write Additive Manufacturing of High-Strength, Short Fiber Reinforced Sandwich Panels." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24501.

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Abstract Additive manufacturing (AM) is a novel technology which allows fabrication of complex geometries from digital representations without tooling. In addition, this technology results in low material waste, short lead times and cost reduction especially for the production of parts in low quantities. Current additive manufacturing processes developed for thermoplastic sandwich panels suffer from an unavoidable weak mechanical performance and low thermal resistance. To overcome these limitations, emphasis is paid in this study on direct write AM technology for the fabrication of short carbon fiber-reinforced sandwich panel composites. Sandwich panels using different infill densities with high strength (> 107 MPa), and high short carbon fiber volume (46%) were attained successfully. In parallel to the strength enhancement, these sandwich panels possessed reduced densities (0.72 g/cc3) due to their lightweight lattice core structures. The mechanical performance of the created sandwich panels was examined and compared to the unreinforced, base ink structures by performing compression tests. Successful fabrication and characterization of the additively manufactured thermoset-based carbon fiber reinforced, sandwich panels in this study can extend the range of applications for AM composites that require lightweight structures, high mechanical performance as well as the desired component complexity.
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Fatoba, O. S., S. A. Akinlabi, E. T. Akinlabi, L. C. Naidoo, A. A. Adediran, and O. S. Odebiyi. "Microstructural Enhancement and Performance of Additive Manufactured Titanium Alloy Grade 5 Composite Coatings." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-24125.

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Abstract The surface integrity of Titanium alloy may be improved by surface modification, to expand its availability for more diverse industrial applications. Additive manufacturing is a commercially competitive manufacturing technique with the possibility of altering the entire perception of design and fabrication. The study experimentally investigates the effects that Ytterbium Laser System process parameters, such as laser power, powder feed rate and traverse speed, has on the resultant microstructure of Ti-6Al-4V grade 5 alloy. The deposition process was conducted employing a 3kW (CW) Ytterbium Laser System (YLS-2000-TR) machine, coaxial to the reinforcement powder. The laser scanning speed and power were varied between the intervals of 1–1.2 m/min and 900–1000 W. All other parameters kept constant were the rate of gas flow, the spot diameter, and the rate of powder flow. The microstructure was characterized by grain size and morphology by using Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). During the DLMD process, the thermal histories induced in the process led to the promotion of the transformed α+β microstructure from the initial primary a microstructure; the growth and evolution of the distinct grain morphologies and stability of the alpha and beta structures upon increased and reduced structures. It was ascertained that by increasing the traverse speeds, the cooling rates increased, which resulted in the decrease in the width of the columnar grains.
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Fatoba, Olawale Samuel, Tien-Chien Jen, and Esther Titilayo Akinlabi. "Characterization. Performance and Microstructural Enhancement of Additive Manufactured AI-Si-Sn-Cu/Ti -6A1-4 V Composite Coatings." In 2022 IEEE 13th International Conference on Mechanical and Intelligent Manufacturing Technologies (ICMIMT). IEEE, 2022. http://dx.doi.org/10.1109/icmimt55556.2022.9845310.

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Gong, Xibing, James Lydon, Kenneth Cooper, and Kevin Chou. "Microstructural Analysis and Nanoindentation Characterization of Ti-6Al-4V Parts From Electron Beam Additive Manufacturing." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36675.

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In this study, the microstructure analysis and nanoindentation characterization from electron beam additive manufacturing (EBAM) were experimentally investigated. Specimens with different build heights of an EBAM built part were tested for microstructure observations by optical microscopy and scanning electron microscopy. The correspondent Young’s modulus and hardness were measured by nanoindentation. Columnar prior β structure is found along the build direction from the X-plane, while the Z-plane is characterized by equiaxed grains and fine Widmanstätten (α+β) structure. The microstructure varies along the build height: the top layers present finer columnar prior β grains and inside Widmanstätten (α+β) structure, while the bottom layers show bigger percentage of α′ martensitic phase owing to the very high cooling rate. Nanoindentation tests identify the highest Young’s modulus of 127.9 GPa and hardness of 6.5 GPa from the top layers of Z-plane. The Young’s modulus and hardness of the middle layers are lower because of the repeated heating. The Z-plane shows higher mechanical properties compared to that of the X-plane. The enhancement of modulus and hardness of the Ti-6Al-4V alloy could be attributed to the strengthening phase of α′ and fine microstructure.
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Wei, Chao, Gabriel Alexander Vasquez Diaz, Kun Wang, and Peiwen Li. "CFD Analysis and Evaluation of Heat Transfer Enhancement of Internal Flow in Tubes With 3D-Printed Complex Fins." In ASME 2019 Heat Transfer Summer Conference collocated with the ASME 2019 13th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ht2019-3630.

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Abstract Additive manufacturing (AM), also known as 3D printing technology, is applied to fabricate complex fin structures for heat transfer enhancement at inner surface of tubes, which conventional manufacturing technology cannot make. This work considered rectangular fins, scale fins, and delta fins with staggered alignment at the inner wall of heat transfer tubes for heat transfer enhancement of internal flows. Designed fin structures are trial-printed using plastic material to exam the printability. Laminar flow convective heat transfer has been numerically studied, and heat transfer performance of the tubes with 3D-printed interrupted fins has been compared to that with conventional straight continued fins. The benefit from heat transfer enhancement and the loss due to increased pumping pressure is evaluated using the total entropy generation rate in the control volume of heat transfer tube. As the conclusion of the study, better heat transfer tubes with 3D-printed internal fins are recommended.
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Reports on the topic "Enhancement additive manufacturing"

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Helge, Torgersen, ed. Additive bio-manufacturing: 3D printing for medical recovery and human enhancement. Vienna: self, 2018. http://dx.doi.org/10.1553/ita-pb-stoa-3d-2018.

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