Articoli di riviste: "Technique additive"

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Prajapati, Devendra Kumar, e Ravinder Kumar. "Additive Manufacturing Sustainability in Industries". Advanced Science, Engineering and Medicine 12, n. 7 (1 luglio 2020): 894–99. http://dx.doi.org/10.1166/asem.2020.2647.

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Additive manufacturing (AM) is an advanced technique to fabricate a three-dimensional object while utilizing materials with minimal wastage to produce complex shape geometries. This technique has escalated practically as well as academically, resulting in a wide range of utility in the current global scenario to ease the manufacturing of complex and intricate objects with the use of various materials, depending upon the properties and availability of the same. Every industries wants to achieve the sustainability, easily can be possible through this manufacturing process. Due to the scope for a large number of design, material and processing combinations, a detailed outlook to how additive manufacturing can be optimized for a highly sustainable and standardized manufacturing practice needs to be assessed and understood. This paper discusses the core knowledge available regarding this manufacturing process and highlights the different processes related to this technique through review of various research papers. And also discuss the sustainability of important additive manufacturing process. Along with the fundamental analysis of this process, the paper also discusses the various attributes of the process and the growth with respect to the latest trends and techniques currently used in industries.

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Нагулин, К., K. Nagulin, С. Курынцев, S. Kuryntsev, А. Горунов e A. Gorunov. "Additive Techniques – the third industrial revolution". Science intensive technologies in mechanical engineering 1, n. 7 (4 luglio 2016): 39–44. http://dx.doi.org/10.12737/20599.

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This paper reports two basic methods of additive techniques, a method of layer-by-layer agglomeration or metal powder melting and a method based on metal surfacing technique. A thorough description of the routine methods of additive techniques their advantages and disadvantages, a product range and field of product application are presented. Basic problems arising at the use of additive techniques and produce manufactured such as the certification of initial material, technology certification, production process control in its development, test procedure of parts manufactured are touched upon. The peculiarities of behavior of blanks obtained through additive techniques at further technological operations, for example, at laser welding are described. Basic trends in researches carried out by leading scientists in the field mentioned are emphasized.

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Long, Jingjunjiao, Ashveen Nand e Sudip Ray. "Application of Spectroscopy in Additive Manufacturing". Materials 14, n. 1 (4 gennaio 2021): 203. http://dx.doi.org/10.3390/ma14010203.

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Additive manufacturing (AM) is a rapidly expanding material production technique that brings new opportunities in various fields as it enables fast and low-cost prototyping as well as easy customisation. However, it is still hindered by raw material selection, processing defects and final product assessment/adjustment in pre-, in- and post-processing stages. Spectroscopic techniques offer suitable inspection, diagnosis and product trouble-shooting at each stage of AM processing. This review outlines the limitations in AM processes and the prospective role of spectroscopy in addressing these challenges. An overview on the principles and applications of AM techniques is presented, followed by the principles of spectroscopic techniques involved in AM and their applications in assessing additively manufactured parts.

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Torralba Arias de Reyna, Álvaro, e Carlos Linares López. "Size-Independent Additive Pattern Databases for the Pancake Problem". Proceedings of the International Symposium on Combinatorial Search 2, n. 1 (19 agosto 2021): 164–71. http://dx.doi.org/10.1609/socs.v2i1.18193.

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The Pancake problem has become a classical combinatorial problem. Different attempts have been made to optimally solve it and/or to derive tighter bounds on the diameter of its state space for a different number of discs. Until very recently, the most successful technique for solving different instances optimally was based on Pattern Databases. Although different approaches have been tried, solutions with Pattern Databases on Pancakes with more than 19 discs have never been reported. In this work, a new technique is introduced which allows the definition of Additive Pattern Databases for solving Pancakes of an arbitrary length. As a result, this technique solves Pancake problems with twice as many discs as the largest ones solved nowadays with other techniques based on Pattern Databases saving up to two orders of magnitude of space.

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Wrześniewska-Tosik, Krystyna, Tomasz Mik, Ewa Wesołowska, Sarah Montes, Tomasz Kowalewski e Michał Kudra. "Composite Nonwovens with Natural Additive". Fibres and Textiles in Eastern Europe 28, n. 1(139) (29 febbraio 2020): 123–29. http://dx.doi.org/10.5604/01.3001.0013.5867.

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Various methods of nonwoven composite materials manufacturing are known. One such method is the well-known technique called spun-bonding. The production technology for composite nonwoven by the spun-bond method is known, but the technique of introducing an additive in the form of shredded wastes of natural origin so as to obtain a composite nonwoven fabric with interesting functional properties is new. The article describes a method of producing an innovative composite nonwoven using the spun-bond technique. As a result of incorporating various additives into the nonwoven structure, composite nonwovens with modified properties are obtained. Composite nonwovens, depending on the additive used, can be utilised as filtration material in the construction, agriculture or automotive industry.

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Uralde, Virginia, Fernando Veiga, Eider Aldalur, Alfredo Suarez e Tomas Ballesteros. "Symmetry and Its Application in Metal Additive Manufacturing (MAM)". Symmetry 14, n. 9 (1 settembre 2022): 1810. http://dx.doi.org/10.3390/sym14091810.

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Additive manufacturing (AM) is proving to be a promising new and economical technique for the manufacture of metal parts. This technique basically consists of depositing material in a more or less precise way until a solid is built. This stage of material deposition allows the acquisition of a part with a quasi-final geometry (considered a Near Net Shape process) with a very high raw material utilization rate. There is a wide variety of different manufacturing techniques for the production of components in metallic materials. Although significant research work has been carried out in recent years, resulting in the wide dissemination of results and presentation of reviews on the subject, this paper seeks to cover the applications of symmetry, and its techniques and principles, to the additive manufacturing of metals.

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Mendricky, Radomir. "ACCURACY ANALYSIS OF ADDITIVE TECHNIQUE FOR PARTS MANUFACTURING". MM Science Journal 2016, n. 05 (16 novembre 2016): 1502–8. http://dx.doi.org/10.17973/mmsj.2016_11_2016169.

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Sasaki, Takafumi, Hitoshi Iwatsuki, Takeo Yamaguchi e Daichi Yamaguchi. "Coated Powder Based Additive Manufacturing using Inkjet Technique". NIP & Digital Fabrication Conference 32, n. 1 (12 settembre 2016): 139–42. http://dx.doi.org/10.2352/issn.2169-4451.2017.32.139.

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Sasaki, Takafumi, Hitoshi Iwatsuki, Takeo Yamaguchi e Daichi Yamaguchi. "Coated Powder Based Additive Manufacturing using Inkjet Technique". NIP & Digital Fabrication Conference 32, n. 1 (12 settembre 2016): 139–42. http://dx.doi.org/10.2352/issn.2169-4451.2016.32.1.art00038_1.

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Hsu, S. C., D. Lin-Vien e R. N. French. "Probing the Concentration Profiles of Additives in Polymers by IR Microspectroscopy: The Diffusion of Cyasorb UV531 in Polypropylene". Applied Spectroscopy 46, n. 2 (febbraio 1992): 225–28. http://dx.doi.org/10.1366/0003702924125690.

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The recent advancement in FT-IR microspectrometry has provided a convenient way to probe the concentration profiles of additives in polymers. This technique opens up intriguing prospects for investigating additive/polymer or polymer/polymer interaction. In this work, the diffusion of a UV stabilizer, UV531, in polypropylene was selected to illustrate the applications of an IR microscope to monitor the concentration profiles of additives in polymers. In addition, a nonlinear least-squares fitting program was written to obtain diffusion coefficients from concentration profiles based on a theoretical model of the diffusion process. Because IR spectroscopy is functional-group specific, this technique is relatively insensitive to the presence of impurities or other additives in studying additive diffusion in polymers. The sensitivity, the aperturing capability, and the high spatial resolution of FT-IR microprobes make it possible to characterize a wider range of diffusion experiments in a shorter period of time than can be done using traditional techniques.

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Hasan, Inamul, R. Mukesh, P. Radha Krishnan, R. Srinath, Dhanya Prakash Babu e Negash Lemma Gurmu. "Wind Tunnel Testing and Validation of Helicopter Rotor Blades Using Additive Manufacturing". Advances in Materials Science and Engineering 2022 (21 settembre 2022): 1–13. http://dx.doi.org/10.1155/2022/4052208.

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This research paper aims to validate the aerodynamic performance of rotor blades using additive manufacturing techniques. Wind tunnel testing is a technique used to find the flow characteristics of the body. Computational fluid dynamics (CFD) techniques are used for aerodynamic analysis, and validation should be done using wind tunnel testing. In the aerodynamic testing of models, additive manufacturing techniques help in validating the results by making models easily for wind tunnels. Recent developments in additive manufacturing help in the aerodynamic testing of models in wind tunnels. The CFD analysis of helicopter rotor blades was analyzed in this research, and validation was done using additive manufacturing techniques. Computational analysis was carried out for static analysis for the forward speeds of Mach numbers 0.3, 0.4, and 0.5. The results obtained were satisfactory to the previous results and were validated with wind tunnel testing. Results proved that the error percentage was lower, and the computational analysis was valid. In this research, models were designed using the FDM technique for wind tunnel testing as it is cost-effective and easy to manufacture.

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Alwan, Haneen, e Zahir Hussain. "A Multiplicative-Additive Chaotic-Address Steganography". Journal of Kufa for Mathematics and Computer 7, n. 2 (1 novembre 2021): 16–25. http://dx.doi.org/10.31642/jokmc/2018/070204.

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In this study, Multiple-Chaotic maps were merged by using multiplicative-additive form to generate the chaotic sequences which are used to track the addresses of shuffled bits in steganography. Three techniques are introduced for image steganography in the spatial domain. The first system is based on the well-known LSB technique, the second system is based on looking for the identical bits between the secret message and the cover image and the third system is based on the concept of LSB substitution, it is employed the mapping of secret data bits with cover pixel bits. It was tested and evaluated security levels for the proposed techniques by using the Peak Signal-to-Noise Ratio (PSNR), Mean Square Error (MSE), histogram analysis and correlative analysis and tested the Chaotic sequences generated by using correlation, Lypaunov exponents, Poincaré section and 0-1Test. The results show that the proposed methods perform better than existed systems.

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Klüver, Enno, Marit Baltzer, Axel Langer e Michael Meyer. "Additive Manufacturing with Thermoplastic Collagen". Polymers 14, n. 5 (28 febbraio 2022): 974. http://dx.doi.org/10.3390/polym14050974.

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Thermoplastic collagen is a partially denatured collagen powder which can be processed by thermoplastic methods such as extrusion and injection molding, but was hitherto not adapted for the use in additive manufacturing (AM) techniques. This paper describes the first successful application of collagen/water/glycerol mixtures in an AM process using a BioScaffolder 3.2 from GeSiM mbH. Strands of molten collagen were deposited onto a building platform forming differently shaped objects. The collagen melt was characterized rheologically and optimal processing conditions were established. The technique includes the use of supporting structures of PLA/wood composite for samples with complex geometry as well as post-processing steps such as the removal of the supporting structure and manual surface smoothing. The manufactured objects are characterized concerning water solubility, swelling behavior and compressibility. Possible applications are in the non-medical sector and include collagen-based pet food or customized organ models for medical training.

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Popov, Vladimir V., e Alexander Fleisher. "Hybrid additive manufacturing of steels and alloys". Manufacturing Review 7 (2020): 6. http://dx.doi.org/10.1051/mfreview/2020005.

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Hybrid additive manufacturing is a relatively modern trend in the integration of different additive manufacturing techniques in the traditional manufacturing production chain. Here the AM-technique is used for producing a part on another substrate part, that is manufactured by traditional manufacturing like casting or milling. Such beneficial combination of additive and traditional manufacturing helps to overcome well-known issues, like limited maximum build size, low production rate, insufficient accuracy, and surface roughness. The current paper is devoted to the classification of different approaches in the hybrid additive manufacturing of steel components. Additional discussion is related to the benefits of Powder Bed Fusion (PBF) and Direct Energy Deposition (DED) approaches for hybrid additive manufacturing of steel components.

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V., Anandakrishnan, Sathish S., Duraiselvam Muthukannan, Dillibabu V. e Balamuralikrishnan N. "Dry sliding wear behavior of Inconel 718 additively manufactured by DMLS technique". Industrial Lubrication and Tribology 72, n. 4 (20 gennaio 2020): 491–96. http://dx.doi.org/10.1108/ilt-08-2019-0322.

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Purpose Aerospace and defence industries use the materials having better properties at elevated temperatures, and Inconel 718 is one of that. The complexity in realizing complex and intricate shapes necessitate the product realization through additive manufacturing. This paper aims to investigate the wear behaviour of additive manufactured material. Design/methodology/approach The wear behaviour of additively manufactured Inconel 718 samples through direct metal laser sintering process at three different build orientations was experimentally investigated using a standard pin-on-disc wear tester. Findings Among the varied wear parameters, the load was identified as the most influencing parameter on the wear rate. In addition, the post-failure analysis of the worn surface of the pins under the scanning electron microscopy revealed the presence of various wear mechanisms. Originality/value Almost, the industries are now focussed on their production through additive manufacturing owing to its advantages. The present work displays the wear behaviour of the additive manufactured Inconel 718 and its associated wear mechanisms. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2019-0322.

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Ozden, Merve G., e Nicola A. Morley. "Laser Additive Manufacturing of Fe-Based Magnetic Amorphous Alloys". Magnetochemistry 7, n. 2 (29 gennaio 2021): 20. http://dx.doi.org/10.3390/magnetochemistry7020020.

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Fe-based amorphous materials offer new opportunities for magnetic sensors, actuators, and magnetostrictive transducers due to their high saturation magnetostriction (λs = 20–40 ppm) and low coercive field compared with polycrystalline Fe-based alloys, which have high magnetostriction but large coercive fields and Co-based amorphous alloys with small magnetostriction (λs = −3 to −5 ppm). Additive layer manufacturing (ALM) offers a new fabrication technique for more complex net-shaping designs. This paper reviews the two different ALM techniques that have been used to fabricate Fe-based amorphous magnetic materials, including the structural and magnetic properties. Selective laser melting (SLM)—a powder-bed fusion technique—and laser-engineered net shaping (LENS)—a directed energy deposition method—have both been utilised to fabricate amorphous alloys, owing to their high availability and low cost within the literature. Two different scanning strategies have been introduced by using the SLM technique. The first strategy is a double-scanning strategy, which gives rise to maximum relative density of 96% and corresponding magnetic saturation of 1.22 T. It also improved the glassy phase content by an order of magnitude of 47%, as well as improving magnetic properties (decreasing coercivity to 1591.5 A/m and increasing magnetic permeability to around 100 at 100 Hz). The second is a novel scanning strategy, which involves two-step melting: preliminary laser melting and short pulse amorphisation. This increased the amorphous phase fraction to a value of up to 89.6%, and relative density up to 94.1%, and lowered coercivity to 238 A/m. On the other hand, the LENS technique has not been utilised as much as SLM in the production of amorphous alloys owing to its lower geometric accuracy (0.25 mm) and lower surface quality, despite its benefits such as providing superior mechanical properties, controlled composition and microstructure. As a result, it has been commonly used for large parts with low complexity and for repairing them, limiting the production of amorphous alloys because of the size limitation. This paper provides a comprehensive review of these techniques for Fe-based amorphous magnetic materials.

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Prashanth, Konda Gokuldoss, e Zhi Wang. "Additive Manufacturing: Alloy Design and Process Innovations". Materials 13, n. 3 (23 gennaio 2020): 542. http://dx.doi.org/10.3390/ma13030542.

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Sakib-Uz-Zaman, Chowdhury, e Mohammad Abu Hasan Khondoker. "A Review on Extrusion Additive Manufacturing of Pure Copper". Metals 13, n. 5 (28 aprile 2023): 859. http://dx.doi.org/10.3390/met13050859.

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Copper, due to its high thermal and electrical conductivity, is used extensively in many industries such as electronics, aerospace, etc. In the literature, researchers have utilized different additive manufacturing (AM) techniques to fabricate parts with pure copper; however, each technique comes with unique pros and cons. Among others, material extrusion (MEX) is a noteworthy AM technique that offers huge potential to modify the system to be able to print copper parts without a size restriction. For that purpose, copper is mixed with a binder system, which is heated in a melt chamber and then extruded out of a nozzle to deposit the material on a bed. The printed part, known as the green part, then goes through the de-binding and sintering processes to remove all the binding materials and densify the metal parts, respectively. The properties of the final sintered part depend on the processing and post-processing parameters. In this work, nine published articles are identified that focus on the 3D printing of pure copper parts using the MEX AM technique. Depending on the type of feedstock and the feeding mechanism, the MEX AM techniques for pure copper can be broadly categorized into three types: pellet-fed screw-based printing, filament-fed printing, and direct-ink write-based printing. The basic principles of these printing methods, corresponding process parameters, and the required materials and feedstock are discussed in this paper. Later, the physical, electrical, and mechanical properties of the final parts printed from these methods are discussed. Finally, some prospects and challenges related to the shrinkage of the printed copper part during post-processing are also outlined.

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Yilmaz, Oguzhan, e Adnan A. Ugla. "Shaped metal deposition technique in additive manufacturing: A review". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 230, n. 10 (6 agosto 2016): 1781–98. http://dx.doi.org/10.1177/0954405416640181.

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Pankin, A. Y., S. E. Kruger, R. J. Groebner, A. Hakim, A. H. Kritz e T. Rafiq. "Validation of transport models using additive flux minimization technique". Physics of Plasmas 20, n. 10 (ottobre 2013): 102501. http://dx.doi.org/10.1063/1.4823701.

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Cajal, Carlos, Jorge Santolaria, David Samper e Jesus Velazquez. "Efficient volumetric error compensation technique for additive manufacturing machines". Rapid Prototyping Journal 22, n. 1 (18 gennaio 2016): 2–19. http://dx.doi.org/10.1108/rpj-05-2014-0061.

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Purpose – This paper aims to present a methodology for volumetric error compensation. This technique is applied to an Objet Eden350V 3D printer and involves a custom measurement strategy. Design/methodology/approach – The kinematic model of the printer is explained, and its error model is simplified to 18 independent error functions. Each error function is defined by a cubic Legendre polynomial. The coefficients of the polynomials are obtained through a Levenberg–Marquardt optimization process. This optimization process compares, in an iterative algorithm, nominal coordinates with actual values of the cloud of points. The points are built in the faces of a gauge artefact as conical sockets defining one unique point for each socket. These points are measured by a coordinate measuring machine self-centring measurement process. Findings – Most of the errors of the 3D printer are systematic. It is possible to obtain an improvement of 70 per cent in terms of global mean error reduction in single points within a volume of 120 × 120 × 40 mm. The forecast of the final error compensation fully matches the actual final error. Practical implications – This methodology can be used for accuracy improvement in additive manufacturing machines. Originality/value – Unlike the calculation of geometric errors, the proposed parametric determination through optimization of the error model allows global error reduction, which decreases all sort of systematic errors concurrently. The proposed measurement strategy allows high reliability, high speed and operator independence in the measurement process, which increases efficiency and reduces the cost. The proposed methodology is easily translated to other rapid prototyping machines and allows scalability when replicating artefacts covering any working volume.

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Gill, Amoljit Singh, Parneet Kaur Deol e Indu Pal Kaur. "An Update on the Use of Alginate in Additive Biofabrication Techniques". Current Pharmaceutical Design 25, n. 11 (6 agosto 2019): 1249–64. http://dx.doi.org/10.2174/1381612825666190423155835.

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Background: Solid free forming (SFF) technique also called additive manufacturing process is immensely popular for biofabrication owing to its high accuracy, precision and reproducibility. Method: SFF techniques like stereolithography, selective laser sintering, fused deposition modeling, extrusion printing, and inkjet printing create three dimension (3D) structures by layer by layer processing of the material. To achieve desirable results, selection of the appropriate technique is an important aspect and it is based on the nature of biomaterial or bioink to be processed. Result & Conclusion: Alginate is a commonly employed bioink in biofabrication process, attributable to its nontoxic, biodegradable and biocompatible nature; low cost; and tendency to form hydrogel under mild conditions. Furthermore, control on its rheological properties like viscosity and shear thinning, makes this natural anionic polymer an appropriate candidate for many of the SFF techniques. It is endeavoured in the present review to highlight the status of alginate as bioink in various SFF techniques.

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Mhetre, Gurudev N., Vijay S. Jadhav, Suhas P. Deshmukh e Chetan M. Thakar. "A Review on Additive Manufacturing Technology". ECS Transactions 107, n. 1 (24 aprile 2022): 15355–74. http://dx.doi.org/10.1149/10701.15355ecst.

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Additive manufacturing is a new, rapidly emerging technique in the industrial sector. This is the process of creating parts by adding layer by layer material, hence it is called as 'Layer Manufacturing Process.’ This process is also called ‘Rapid Prototyping’ or ‘3DPrinting.’ This is a tool-less manufacturing method that produces parts in less time and with high precision. This process provides freedom for designing the parts and their complexity. Additive manufacturing has many advantages over conventional manufacturing processes like low production cost, no residual stresses, no wastage of material, etc. Nowadays, so much research work is going on in this additive manufacturing field. This manufacturing technology is going to replace the conventional manufacturing techniques in the upcoming days. In this paper, we discuss about the various additive manufacturing methods, its principles, applications, advantages, and challenges to industrial use.

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Preston, Daniel, Ahmed Ashour, Julian Wright, James Watts, Daniel Sanmartin e Jacques Wood. "Controlled Creation of Contact Cracks in Additive Manufactured Components". Applied Sciences 13, n. 21 (2 novembre 2023): 11990. http://dx.doi.org/10.3390/app132111990.

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Techniques for the controlled seeding and growth of cracks are urgently required for non-destructive testing technique evaluation, particularly for additive manufactured (AM) samples. This paper describes a method that uses a combination of the tensile load and the resonance excitation of notched AM samples, with in situ monitoring of the resonance frequency serving to track the crack dimensions. Mechanical low-cycle fatigue cracks, ranging in length from ~0.3 mm to ~5 mm, were successfully created in five AM samples using this technique. The samples were non-destructively characterized using optical microscopy and Nonlinear Resonance (NLR) testing. The exploitation of resonance enabled the concentration of a significant number of stress cycles on the samples in much shorter timespans than conventional fatigue testing, enabling a high throughput while utilizing compact components. Furthermore, the tracking of the resonance frequency shift throughout the process enabled non-invasive and no-contact real-time condition monitoring.

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Luhar, Salmabanu, e Ismail Luhar. "Additive Manufacturing in the Geopolymer Construction Technology: A Review". Open Construction & Building Technology Journal 14, n. 1 (30 luglio 2020): 150–61. http://dx.doi.org/10.2174/1874836802014010150.

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This research paper presents a scientific attempt of a comprehensive systematic review of three-dimensional printing in geopolymer construction technology. The concept of 3D printing is an automated manufacturing process, layer- by- layer command, with computer-aided design model to create physical objects, acquiring swift development for the last few decades. An expansion of novel Geopolymer technology has been adopted in the construction and infrastructure industries for decades. The critical challenges of construction and infrastructure industries, such as the need for architectural, holistic, and rational designs, can be dealt with 3D printing techniques. Plentiful advantages of this emerging novel technology include a reduced amount of cost, ease of construction, a lesser amount of time, freedom of design, less wastage, aptitude to create complex structures, decrease in labor requirements, etc. Accordingly, The paper discusses common 3D techniques, such as Fused Deposition Modelling, Selective Laser Sintering, Stereolithography, 3D plotting, Laminated Object Manufacturing technique, Direct Energy deposition technique or laser engineered net shaping, Powder Bed Fusion and Inject Head 3D printing and direct deposition method. Overall, this study provides an introduction of 3D printing automation and robotics processes in a geopolymer construction industry. Ultimately, the paper emphasizes to motivate researchers towards future studies about 3D printing.

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Bartalné Berceli, Mónika, Eszter Izsó, Szilveszter Gergely e András Salgó. "Effects of special additives in wheat dough system measured by Mixolab technique". Czech Journal of Food Sciences 39, No. 6 (16 dicembre 2021): 460–68. http://dx.doi.org/10.17221/228/2020-cjfs.

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Three novel bread additives were developed, namely wheat bran (WB), wheat aleurone-rich flour (ARF) fraction and germinated soybean [sprouted soy-based additive (YASO)]. Their applications were tested in bread dough systems. The additives showed different chemical compositions targeting different nutritional effects in bread. In each case, three different concentration ranges were used (WB 10–30%, ARF 10–30%, YASO 10–50%). Rheological differences were sensitively detected by the Mixolab technique in the mixed dough. So the rheological effects caused by compositional changes were reflected by the results of the above-mentioned technique. Based on Mixolab curves, optimal levels of applied additives (WB 14%, ARF 25% and YASO 30%) were defined. These are acceptable from a compositional and rheological point of view as well. The optimised mixtures were tested with the measurements of Rapid Visco Analyser (RVA) in slurry form, and characteristic effects of additives were observed. Based on Mixolab and RVA techniques, valuable rheological 'fingerprints' could be generated. These support the conscious and planned modification of rheological properties of bread products and the application of novel bread additives.

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Mohd-Lair, Noor Ajian, Jia Kit Hong e Mohd Suffian Misaran. "The Linear Regression vs. Additive Forecast Techniques in Predicting Palm Oil Estate Monthly Delivery Quantity". Applied Mechanics and Materials 465-466 (dicembre 2013): 1127–32. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.1127.

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The quantity of palm oil fruits supplied from palm oil estates often affects the number of workers required and the area to be harvested. Thus, the ultimate objective of this research is to develop a system to forecast monthly delivery quantities such that the companys profit will increase through proper balance between supply and demand. This research is limited to 10 years of monthly deliveries from a palm oil estates deliver to only one palm oil mill as the case study. Two forecast techniques were chosen; the linear regression and additive forecast methods. Based on theories and formulations of the selected forecast techniques, forecast software was developed. For this software, user only needs to specify the year to be forecasted and choose one forecast technique to be used. Then, the forecasted values and errors were calculated and the results were displayed on the GUI. The performance of each technique was compared based on the mean absolute percentage error (MAPE). The generated results showed that the additive method produced lower MAPE compared to the linear regression method. This proved that the additive method is a better technique to predict the monthly delivery quantities of the palm fruits by the estate.

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Evans, Samuel, Eric Jones, Peter Fox e Chris Sutcliffe. "Photogrammetric analysis of additive manufactured metallic open cell porous structures". Rapid Prototyping Journal 24, n. 8 (12 novembre 2018): 1380–91. http://dx.doi.org/10.1108/rpj-05-2017-0082.

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PurposeThis paper aims to introduce a novel method for the analysis of open cell porous components fabricated by laser-based powder bed metal additive manufacturing (AM) for the purpose of quality control. This method uses photogrammetric analysis, the extraction of geometric information from an image through the use of algorithms. By applying this technique to porous AM components, a rapid, low-cost inspection of geometric properties such as material thickness and pore size is achieved. Such measurements take on greater importance, as the production of porous additive manufactured orthopaedic devices increases in number, causing other, slower and more expensive methods of analysis to become impractical.Design/methodology/approachHere the development of the photogrammetric method is discussed and compared to standard techniques including scanning electron microscopy, micro computed tomography scanning and the recently developed focus variation (FV) imaging. The system is also validated against test graticules and simple wire geometries of known size, prior to the more complex orthopaedic structures.FindingsThe photogrammetric method shows an ability to analyse the variability in build fidelity of AM porous structures for use in inspection purposes to compare component properties. While measured values for material thickness and pore size differed from those of other techniques, the new photogrammetric technique demonstrated a low deviation when repeating measurements, and was able to analyse components at a much faster rate and lower cost than the competing systems, with less requirement for specific expertise or training.Originality/valueThe advantages demonstrated by the image-based technique described indicate the system to be suitable for implementation as a means of in-line process control for quality and inspection applications, particularly for high-volume production where existing methods would be impractical.

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Azat Abdulkareem, Maryam, e Abdulla M.W. Al-Shamma. "Additive Manufacturing Technologies in Dentistry (A Review)". Tikrit Journal for Dental Sciences 12, n. 1 (30 giugno 2024): 21–32. http://dx.doi.org/10.25130/tjds.12.1.3.

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Background: Significant advancements have been observed in the additive manufacturing (AM) technology industry in recent decades. Due to the inherent variations among each AM manufacturing technique, new areas of investigation continually arise and require consideration. Additionally, the novel applications of additive manufacturing present new difficulties and possibilities for targeted focus. The aim of this manuscript is to conduct a comprehensive literature review that describes the various processing methods, precision levels, types of materials utilized, and potential applications of 3D printing technology in the field of dentistry. Data: An online search was conducted on databases including Research Gate, Google Scholar, and PubMed to identify potential applications of AM technologies in the dental industry. The most relevant studies on the subject were selected, including English-language articles published between 2006 and 2022. Conclusion: It is feasible to incorporate a variety of AM techniques in dentistry, which has led to improved workflow and acceptable clinical results. Moreover, the different technologies of 3D printing have a broad array of potential applications, enabling the development of novel and optimized techniques to produce dental products.

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Davies, P., H. Davies e S. Marchisio. "The Bonding of Additive Manufactured Ti-6Al-4V via the Powder Interlayer Bonding (PIB) Process". MATEC Web of Conferences 321 (2020): 04022. http://dx.doi.org/10.1051/matecconf/202032104022.

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Powder interlayer bonding (PIB) is a novel joining technique. The technique has been developed to facilitate high integrity repairs of aerospace components, manufactured from titanium alloys commonly employed in the aerospace industry. The PIB technique utilises an interlayer between the two faying surfaces. In this study heating was supplied via induction, enabling a bond to be created in an inert atmosphere, shielding the fusion zone from oxidation during bonding. The PIB technique proved capable of producing high integrity bonds in additive manufactured Ti-6Al-4V, where approximately 85% of the strength of the alloy is retained after bonding. Advantages of this technique over more established joining methods such as tungsten inert gas (TIG) welding and plasma arc (PA) welding include a narrow fusion zone and localised heating. It is believed that PIB can compete against these more mature techniques, providing a technique suitable for joining a range of alloys found in the aerospace industry.

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Davies, P., H. Davies e S. Marchisio. "The Bonding of Additive Manufactured Ti-6Al-4V via the Powder Interlayer Bonding (PIB) Process". MATEC Web of Conferences 321 (2020): 04041. http://dx.doi.org/10.1051/matecconf/202032104041.

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Abstract (sommario):

Powder interlayer bonding (PIB) is a novel joining technique. The technique has been developed to facilitate high integrity repairs of aerospace components, manufactured from titanium alloys commonly employed in the aerospace industry. The PIB technique utilises an interlayer between the two faying surfaces. In this study heating was supplied via induction, enabling a bond to be created in an inert atmosphere, shielding the fusion zone from oxidation during bonding. The PIB technique proved capable of producing high integrity bonds in additive manufactured Ti-6Al-4V, where approximately 85% of the strength of the alloy is retained after bonding. Advantages of this technique over more established joining methods such as tungsten inert gas (TIG) welding and plasma arc (PA) welding include a narrow fusion zone and localised heating. It is believed that PIB can compete against these more mature techniques, providing a technique suitable for joining a range of alloys found in the aerospace industry.

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Nargatti, Kiran, e Sandeep Ahankari. "Additive Manufacturing of Supercapacitor Electrodes – Materials, Methods and Design". Key Engineering Materials 913 (18 marzo 2022): 59–75. http://dx.doi.org/10.4028/p-t38h57.

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Fabrication of supercapacitor (SC) electrodes plays a vital role in enhancing the electrochemical performance of SCs. Conventional fabrication techniques have limitations in fabricating the complex SC electrodes. The three-dimentional (3D) printing technique has several advantages over conventional manufacturing techniques that includes patterning capability, contact-less high-resolution, controlled material deposition, design flexibility, and multi-material compatibility. Due to these excellent qualities, considerable research efforts have been made in developing 3D printed SC electrodes. This review offers a literature update on the recent printing materials employed and the design aspects in making of SC electrodes. It also discusses the impact of critical parameters involved in various techniques of 3D printing of electrodes. Finally, the paper concludes with the scope and challenges in material/manufacturing of electrodes and the performance comparative analysis of various 3D printed structures.

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FUJII, Hiromichi. "Additive Manufacturing Technique Based on Ultrasonic Welding of Metallic Foils". JOURNAL OF THE JAPAN WELDING SOCIETY 81, n. 4 (2012): 224–27. http://dx.doi.org/10.2207/jjws.81.224.

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Hemavardhini, A., V. Vidyashree Nandini, Mathivathani S P e Shiney Boruah. "Customized Gingival Retraction Cord using Additive Manufacturing: A Novel Technique". International Journal of Current Research and Review 13, n. 16 (2021): 84–87. http://dx.doi.org/10.31782/ijcrr.2021.131622.

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Gumbleton, Richard, Jerome A. Cuenca, Samuel Hefford, Kenneth Nai e Adrian Porch. "Measurement Technique for Microwave Surface Resistance of Additive Manufactured Metals". IEEE Transactions on Microwave Theory and Techniques 69, n. 1 (gennaio 2021): 189–97. http://dx.doi.org/10.1109/tmtt.2020.3035082.

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Hayashi, Terutake, Hideaki Yokoo, Syuhei Kurokawa, Keigo Matsunaga, Wang Chengwu e Youji Matsukawa. "A novel laser surface processing technique for additive layer manufacturing". Proceedings of Manufacturing Systems Division Conference 2016 (2016): 302. http://dx.doi.org/10.1299/jsmemsd.2016.302.

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Partridge, Simon W., Matthew J. Benning, Matthew J. German e Kenneth W. Dalgarno. "Development of an arthroscopically compatible polymer additive layer manufacture technique". Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 231, n. 6 (giugno 2017): 586–94. http://dx.doi.org/10.1177/0954411917690560.

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This article describes a proof of concept study designed to evaluate the potential of an in vivo three-dimensional printing route to support minimally invasive repair of the musculoskeletal system. The study uses a photocurable material to additively manufacture in situ a model implant and demonstrates that this can be achieved effectively within a clinically relevant timescale. The approach has the potential to be applied with a wide range of light-curable materials and with development could be applied to create functionally gradient structures in vivo.

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HAMAGUCHI, Takashi, Yingjuan YANG, Shinji MATSUSHITA, Minseok PARK e Atsuhiko OONUMA. "Development of Manufacturing Shape Design Technique for Metal Additive Manufacturing". Proceedings of Design & Systems Conference 2019.29 (2019): 2306. http://dx.doi.org/10.1299/jsmedsd.2019.29.2306.

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Mohammadi, Kaivan, Mohammad R. Movahhedy, Igor Shishkovsky e Reza Hedayati. "Hybrid anisotropic pentamode mechanical metamaterial produced by additive manufacturing technique". Applied Physics Letters 117, n. 6 (10 agosto 2020): 061901. http://dx.doi.org/10.1063/5.0014167.

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BANDELT, H., e A. DRESS. "Weak hierarchies associated with similarity measures—An additive clustering technique". Bulletin of Mathematical Biology 51, n. 1 (1989): 133–66. http://dx.doi.org/10.1016/s0092-8240(89)80053-9.

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陈, 建伟. "Research Progress on Application of NDT in Additive Manufacturing Technique". Applied Physics 08, n. 02 (2018): 91–99. http://dx.doi.org/10.12677/app.2018.82011.

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Vega, E. J., M. G. Cabezas, B. N. Muñoz-Sánchez, J. M. Montanero e A. M. Gañán-Calvo. "A novel technique to produce metallic microdrops for additive manufacturing". International Journal of Advanced Manufacturing Technology 70, n. 5-8 (22 ottobre 2013): 1395–402. http://dx.doi.org/10.1007/s00170-013-5357-3.

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Bandelt, H. J., e A. W. M. Dress. "Weak hierarchies associated with similarity measures—An additive clustering technique". Bulletin of Mathematical Biology 51, n. 1 (gennaio 1989): 133–66. http://dx.doi.org/10.1007/bf02458841.

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Paduraru, Emilian, Catalin-Gabriel Dumitras, Dragos-Florin Chitariu, Mihaita Horodinca e Florin Chifan. "Research on Additive Technique Parameter Optimization for Robotic Gripper Construction". Machines 11, n. 6 (4 giugno 2023): 621. http://dx.doi.org/10.3390/machines11060621.

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Designing an industrial robot gripper suitable for today’s industry is a challenging task due to the rapid evolution of products. Industrial robots are involved in machining, the transfer of parts, control and assembly, and the number of tasks performed by robots are increasing. Robots need to have the capability to adapt to new jobs consisting of new parts and new trajectories, and in most cases the preferred end effectors are grippers. In turn, grippers need to be flexible enough in order to cope with these changes. For this research, the authors propose a new gripper design which is capable of handling a large variety of parts with different sizes and shapes. In this research, an electrically actuated four-jaw gripper, with the capability of parallel movement of its jaws, is presented that also has the capability to fold the clamping jaws two by two and become a two-jaw gripper. Since the design is most suitable for additive manufacturing techniques, different additive techniques are analyzed for the manufacturing of the gripper. In the second part of the paper, different setups of the 3D printers are considered, such as infill percentage, raster angle and layer height. The main material on focus is a PET with grinded carbon-fiber reinforcement, but different materials are used for a better comparison of the rigidity of the system. This comparison is also presented in this article. The analysis of the material and 3D printing parameters are tested with Standard D638-14 probes used in a traction testing machine. After performing the traction test, the results are compared with FEA analysis. An optimal solution based on the experimental tests is proposed for the manufacture of the proposed gripper design.

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Calignano, Flaviana, Manuela Galati, Luca Iuliano e Paolo Minetola. "Design of Additively Manufactured Structures for Biomedical Applications: A Review of the Additive Manufacturing Processes Applied to the Biomedical Sector". Journal of Healthcare Engineering 2019 (12 marzo 2019): 1–6. http://dx.doi.org/10.1155/2019/9748212.

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Additive manufacturing (AM) is a disruptive technology as it pushes the frontier of manufacturing towards a new design perspective, such as the ability to shape geometries that cannot be formed with any other traditional technique. AM has today shown successful applications in several fields such as the biomedical sector in which it provides a relatively fast and effective way to solve even complex medical cases. From this point of view, the purpose of this paper is to illustrate AM technologies currently used in the medical field and their benefits along with contemporary. The review highlights differences in processes, materials, and design of additive manufacturing techniques used in biomedical applications. Successful case studies are presented to emphasise the potentiality of AM processes. The presented review supports improvements in materials and design for future researches in biomedical surgeries using instruments and implants made by AM.

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Bedmar, Javier, Ainhoa Riquelme, Pilar Rodrigo, Belen Torres e Joaquin Rams. "Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel". Materials 14, n. 21 (29 ottobre 2021): 6504. http://dx.doi.org/10.3390/ma14216504.

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In additive manufacturing (AM), the technology and processing parameters are key elements that determine the characteristics of samples for a given material. To distinguish the effects of these variables, we used the same AISI 316L stainless steel powder with different AM techniques. The techniques used are the most relevant ones in the AM of metals, i.e., direct laser deposition (DLD) with a high-power diode laser and selective laser melting (SLM) using a fiber laser and a novel CO2 laser, a novel technique that has not yet been reported with this material. The microstructure of all samples showed austenitic and ferritic phases, which were coarser with the DLD technique than for the two SLM ones. The hardness of the fiber laser SLM samples was the greatest, but its bending strength was lower. In SLM with CO2 laser pieces, the porosity and lack of melting reduced the fracture strain, but the strength was greater than in the fiber laser SLM samples under certain build-up strategies. Specimens manufactured using DLD showed a higher fracture strain than the rest, while maintaining high strength values. In all the cases, crack surfaces were observed and the fracture mechanisms were determined. The processing conditions were compared using a normalized parameters methodology, which has also been used to explain the observed microstructures.

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Hulme-Smith, Christopher Neil, Vignesh Hari e Pelle Mellin. "Spreadability Testing of Powder for Additive Manufacturing". BHM Berg- und Hüttenmännische Monatshefte 166, n. 1 (gennaio 2021): 9–13. http://dx.doi.org/10.1007/s00501-020-01069-9.

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AbstractThe spreading of powders into thin layers is a critical step in powder bed additive manufacturing, but there is no accepted technique to test it. There is not even a metric that can be used to describe spreading behaviour. A robust, image-based measurement procedure has been developed and can be implemented at modest cost and with minimal training. The analysis is automated to derive quantitative information about the characteristics of the spread layer. The technique has been demonstrated for three powders to quantify their spreading behaviour as a function of layer thickness and spreading speed.

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Tabanykhova, Marina, Nikolay Stolyarov e Arthur Nagel. "The issue of residual stresses in additive technologies". MATEC Web of Conferences 376 (2023): 01008. http://dx.doi.org/10.1051/matecconf/202337601008.

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The paper considers the issue of residual stresses in 3D-printed plastic models. Most additive technologies create residual stresses in products. Residual stresses occur in the printed material due to its expansion when heated and contraction when cooled. Residual stresses and their intensity depend on the printing technology and technique. The paper discusses the impact of printing techniques and various printing nozzle diameters and model shapes (rectangular, circular) on the occurrence of residual stresses in specimens. As part of the study, in transparent models, residual stresses were detected using a PPU-7 polarization-projection unit. Two series of six specimens each have been printed. The first and second series models had the shape of a parallelepiped and a disk, respectively. The frequency-division multiplexing technology was chosen. In the study, the models were manufactured from a polyethylene terephthalate-glycol plastic filament. This material has a high optical sensitivity. Nozzles of two diameters (0.4 and 1 mm) were used to print specimens. Shell-less and singleand double-shell specimens were printed. The dependence of residual stresses on the specimen shape, the printing nozzle diameter, and the model shell thickness has been estimated. The study is focused on finding a technique for printing models from plastic filament, completely free of residual stresses in the specimen material. This is dictated by the photoelasticity requirements for piezo-optical materials, including some transparent plastics used in 3D printing.

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Jensen, Peter K., Joshua T. Mills e Micah Shepherd. "Internal damping measurements of additive manufactured metal beams". Journal of the Acoustical Society of America 155, n. 3_Supplement (1 marzo 2024): A266. http://dx.doi.org/10.1121/10.0027448.

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Abstract (sommario):

Modern additive manufacturing (AM) techniques have created an endless number of new design possibilities. Naturally, it is important to understand how the material properties, including internal damping, differ for AM structures. An experimental procedure has been developed to measure an upper bound for the internal damping of metal beams by minimizing the effects of energy dissipation at the supports and acoustic radiation into the surrounding air. In this talk, measurements for the loss factor of several common metals will be compared to equivalent samples constructed by powder bed fusion at varying angles. The results will also be compared to Zener’s thermoelasticity model, developed for isotropic Euler beams in flexure. Reasons for deviation from theory which arise from the manufacturing technique will be explored.

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Hu, Chao, Zeyu Sun, Yi Xiao e Qinghua Qin. "Recent Patents in Additive Manufacturing of Continuous Fiber Reinforced Composites". Recent Patents on Mechanical Engineering 12, n. 1 (20 febbraio 2019): 25–36. http://dx.doi.org/10.2174/2212797612666190117131659.

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Background: Additive Manufacturing (AM) enables the accurate fabrication of designed parts in a short time without the need for specific molds and tools. Although polymers are the most widely used raw materials for AM, the products printed by them are inherently weak, unable to sustain large tension or bending stresses. A need for the manufacturing of fiber reinforced composites, especially continuous fiber as reinforcement, has attracted great attention in recent years. Objective: Identifying the progress of the AM of continuous carbon fiber reinforced composites over time and therefore establishing a foundation on which current research can be based. Methods: Elaborating the most related patents regarding the AM techniques for fabricating continuous fiber reinforced composites in the top three institutions, including Markforged company, Xi’an Jiaotong University and President and Fellows of Harvard College. Results: The recent patents in AM of continuous fiber reinforced composites are classified into two aspects: patents related to novel technique methods and patents related to novel structures. The current issues and future development of AM-based composites are given. Conclusion: New structures and techniques have been introduced into conventional 3D printers to enable the printing of continuous fiber reinforced composites. However, until now, Markforged is the only company commercializing the fabrication of this kind of composites based on AM technique. Numerous challenges and issues need to be solved so that AM of continuous fiber reinforced composites can be a new manufacturing method.

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