Journal articles: 'Enhancement additive manufacturing'

1

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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8

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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Speranza, Domenico, Daniela Citro, Francesco Padula, Barbara Motyl, Federica Marcolin, Michele Calì, and Massimo Martorelli. "Additive Manufacturing Techniques for the Reconstruction of 3D Fetal Faces." Applied Bionics and Biomechanics 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/9701762.

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This paper deals with additive manufacturing techniques for the creation of 3D fetal face models starting from routine 3D ultrasound data. In particular, two distinct themes are addressed. First, a method for processing and building 3D models based on the use of medical image processing techniques is proposed. Second, the preliminary results of a questionnaire distributed to future parents consider the use of these reconstructions both from an emotional and an affective point of view. In particular, the study focuses on the enhancement of the perception of maternity or paternity and the improvement in the relationship between parents and physicians in case of fetal malformations, in particular facial or cleft lip diseases.

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Omairi, Amzar, and Zool Hilmi Ismail. "Towards Machine Learning for Error Compensation in Additive Manufacturing." Applied Sciences 11, no. 5 (March 8, 2021): 2375. http://dx.doi.org/10.3390/app11052375.

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Additive Manufacturing (AM) of three-dimensional objects is now being progressively realised with its ad-hoc approach with minimal material wastage (lean manufacturing) being one of its benefit by default. It could also be considered as an evolutional paradigm in the manufacturing industry with its long list of application as of late. Artificial Intelligence is currently finding its usefulness in predictive modelling to provide intelligent, efficient, customisable, high-quality and sustainable-oriented production process. This paper presents a comprehensive survey on commonly used predictive models based on heuristic algorithms and discusses their applications toward making AM “smart”. This paper summarises AM’s current trend, future opportunity, gaps, and requirements together with recommendations for technology and research for inter-industry collaboration, educational training and technology transfer in the AI perspective in-line with the Industry 4.0 developmental process. Moreover, machine learning algorithms are presented for detecting product defects in the cyber-physical system of additive manufacturing. Based on reviews on various applications, printability with multi-indicators, reduction of design complexity threshold, acceleration of prefabrication, real-time control, enhancement of security and defect detection for customised designs are seen of as prospective opportunities for further research.

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Wang, Zhisheng, Wei Fan, He Shi, Pengyu Shi, and Rongxiao Don. "Study of atomization characteristics of air atomizing nozzles for additive manufacturing." Journal of Physics: Conference Series 2228, no. 1 (March 1, 2022): 012032. http://dx.doi.org/10.1088/1742-6596/2228/1/012032.

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Abstract In the present study, a series of experiments on the fuel jet from a 3D-printed swirling nozzle were performed. The particle size distribution of the fuel at different injection pressures was measured by a particle size analyzer, and the enhancement of the jet atomization by swirling air was also evaluated. The Rosin-Rammler distribution model was used to analyze the trend of the jet distribution modulus along with the fuel inject pressure, and the particle size variation analyzed the jet development process. The applicability of 3D printed nozzles for aero-engine was evaluated by varying the nozzle flow number.

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Ishimoto, Takuya, and Takayoshi Nakano. "Microstructural control and functional enhancement of light metal materials via metal additive manufacturing." Journal of Japan Institute of Light Metals 72, no. 6 (June 15, 2022): 327–33. http://dx.doi.org/10.2464/jilm.72.327.

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15

Akasheh, Firas, and Heshmat Aglan. "Fracture toughness enhancement of carbon fiber–reinforced polymer composites utilizing additive manufacturing fabrication." Journal of Elastomers & Plastics 51, no. 7-8 (December 25, 2018): 698–711. http://dx.doi.org/10.1177/0095244318817867.

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The present work reports a novel approach to enhance the fracture resistance and notch sensitivity of carbon fiber-reinforced polymer composites utilizing additive manufacturing (3-D printing) fabrication. The 3-D printed composites utilize carbon fiber bundles to reinforce nylon/chopped fiber resin in a multilayered structure configuration. Single-edge (60°) notched samples were printed using Mark Two printer. Three reinforcement schemes were designed and used to manufacture the specimens. The focus was placed on selective reinforcement at the crack tip to arrest crack initiation. The mechanical properties, fracture toughness, and fracture behavior of the printed composites were evaluated. It was found that wrapping fiber around the notch effectively blunted the notch and redirected crack propagation away from the notch tip, thereby lengthening the crack path and leading to improved fracture resistance. It was also found that such improvement reaches a saturation level. Excessive notch reinforcement beyond optimal limit can reverse the gains in fracture resistance due to notch-targeted reinforcement. Examination of the fracture surface morphology of the printed composites reveals lack of fusion of the sizing of the individual continuous carbon fiber bundles and the lack of adhesion between the matrix layers (nylon/chopped fiber resin) and the adjacent carbon fiber bundle reinforcement. Damage to the fibers within the carbon bundle was also observed. Thus, a synergetic effect of the carbon fiber bundles reinforcement and the matrix requires more optimization to manufacture carbon-reinforced polymer composites using 3-D printing.

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Ghim, Min-Soo, Hyung Woo Kim, and Young-Sam Cho. "Enhancement fidelity of Kagome scaffold for bone regeneration by design for additive manufacturing." Materials & Design 225 (January 2023): 111608. http://dx.doi.org/10.1016/j.matdes.2023.111608.

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17

Zeiser, Alexander, Bekir Özcan, Christoph Kracke, Bas van Stein, and Thomas Bäck. "A data-centric approach to anomaly detection in layer-based additive manufacturing." at - Automatisierungstechnik 71, no. 1 (January 1, 2023): 81–89. http://dx.doi.org/10.1515/auto-2022-0104.

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Abstract Anomaly detection describes methods of finding abnormal states, instances or data points that differ from a normal value space. Industrial processes are a domain where predicitve models are needed for finding anomalous data instances for quality enhancement. A main challenge, however, is absence of labels in this environment. This paper contributes to a data-centric way of approaching artificial intelligence in industrial production. With a use case from additive manufacturing for automotive components we present a deep-learning-based image processing pipeline. We integrate the concept of domain randomisation and synthetic data in the loop that shows promising results for bridging advances in deep learning and its application to real-world, industrial production processes.

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Ali, Usman, Haniyeh Fayazfar, Farid Ahmed, and Ehsan Toyserkani. "Internal surface roughness enhancement of parts made by laser powder-bed fusion additive manufacturing." Vacuum 177 (July 2020): 109314. http://dx.doi.org/10.1016/j.vacuum.2020.109314.

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19

Zanini, Filippo, Elia Sbettega, and Simone Carmignato. "X-ray computed tomography for metal additive manufacturing: challenges and solutions for accuracy enhancement." Procedia CIRP 75 (2018): 114–18. http://dx.doi.org/10.1016/j.procir.2018.04.050.

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20

Zhukov, V. E., N. N. Mezentseva, and A. N. Pavlenko. "Heat Transfer Enhancement on Surface Modified via Additive Manufacturing during Pool Boiling of Freon." Journal of Engineering Thermophysics 31, no. 4 (December 2022): 551–62. http://dx.doi.org/10.1134/s1810232822040014.

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21

Kim, Jae-Eun, and Keun Park. "Correction to: Multiscale Topology Optimization Combining Density-Based Optimization and Lattice Enhancement for Additive Manufacturing." International Journal of Precision Engineering and Manufacturing-Green Technology 8, no. 4 (January 26, 2021): 1369. http://dx.doi.org/10.1007/s40684-020-00307-2.

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Chen, Wei, Lianyong Xu, Kangda Hao, Yongdian Han, Lei Zhao, and Hongyang Jing. "Additive manufacturing of 15-5PH/WC composites with the synergistic enhancement of strength and ductility." Materials Science and Engineering: A 840 (April 2022): 142926. http://dx.doi.org/10.1016/j.msea.2022.142926.

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23

Gordon, Jerard, Jacob Hochhalter, Christina Haden, and D. Gary Harlow. "Enhancement in fatigue performance of metastable austenitic stainless steel through directed energy deposition additive manufacturing." Materials & Design 168 (April 2019): 107630. http://dx.doi.org/10.1016/j.matdes.2019.107630.

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24

Burad, Prayag, G. Chaitanya, Nikhil Thawari, Jatin Bhatt, and T. V. K. Gupta. "Characterization of Additive Manufactured Inconel 718 Alloy Using Laser Cladding." Key Engineering Materials 882 (April 2021): 3–10. http://dx.doi.org/10.4028/www.scientific.net/kem.882.3.

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Laser based metal additive manufacturing (AM) is an emerging technology in various aerospace industries including aero-engine components and turbine manufactures. Laser cladding is a potential process for material deposition and surface enhancement technique that forms a strong metallurgical bond with the substrate. In the present study, Nickel based Inconel 718 (IN718) super alloy which maintains high strength working at elevated temperatures is used as the clad material. The study investigates the processing of Inconel 718 with powder morphology and microstructural properties and also two, three and four-layer deposition. This study explores the possibility of depositing IN718 using laser cladding that can be better considered as metal AM process.

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Mechtcherine, Viktor, Albert Michel, Marco Liebscher, and Tobias Schmeier. "Extrusion-Based Additive Manufacturing with Carbon Reinforced Concrete: Concept and Feasibility Study." Materials 13, no. 11 (June 4, 2020): 2568. http://dx.doi.org/10.3390/ma13112568.

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Additive manufacturing with cement-based materials needs sound approaches for the direct, seamless integration of reinforcement into structural and non-structural elements during their fabrication. Mineral-impregnated Carbon-Fibre (MCF) composites represent a new type of non-corrosive reinforcement that offers great potential in this regard. MCF not only exhibits high performance with respect to its mechanical characteristics and durability, but it also can be processed and shaped easily in the fresh state and, what is more, automated. This article describes different concepts for the continuous, fully automated integration of MCF reinforcement into 3D concrete printing based on layered extrusion. Moreover, for one of the approaches presented and discussed, namely 3D concrete printing with MCF supply from a continuous, stationary impregnation line and deposition of MCF between concrete filaments, a feasibility study was performed using a gantry 3D printer. Small-scale walls were printed and eventually used for the production of specimens for mechanical testing. Three-point bend tests performed on two different beam geometries showed a significant enhancement of both flexural strength and, more especially, deformability of the specimens reinforced with MCF in comparison to the specimens made of plain concrete.

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Fan, Congze, Zhongde Shan, Guisheng Zou, Li Zhan, and Dongdong Yan. "Performance of Short Fiber Interlayered Reinforcement Thermoplastic Resin in Additive Manufacturing." Materials 13, no. 12 (June 26, 2020): 2868. http://dx.doi.org/10.3390/ma13122868.

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To further improve the mechanical properties of thermoplastic resin in additive manufacturing (AM), this paper presents a novel method to directly and quantitatively place the short fibers (SFs) between two printing process of resin layers. The printed composite parts with SFs between the layers was reinforced. The effects of single-layer fiber content, multi-layer fiber content and the length of fibers on the mechanical properties of printed specimens were studied. The distribution of fibers and quality of interlayer bonding were assessed using mechanical property testing and microstructure examination. The results showed that the tensile strength of the single-layered specimen with 0.5 wt% interlayered SFs increased by 18.82%. However, when the content of SFs continued to increase, the mechanical properties declined because of the increasing interlayered gap and the poor bonding quality. In addition, when the interlayered SFs length was 0.5–1 mm, the best reinforcement was obtained. To improve the interfacial bonding quality between the fiber and the resin, post-treatment and laser-assisted preheating printing was used. This method is effective for the enhancement of the interfacial bonding to obtain better mechanical properties. The research proves that adding SFs by placement can reduce the wear and breakage of the fibers compared to the conventional forming process. Therefore, the precise control of the length and content of SFs was realized in the specimen. In summary, SFs placement combined with post-treatment and laser-assisted preheating is a new method in AM to improve the performance of thermoplastic resin.

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Yang, Lining, Donghao Zheng, Guojie Jin, and Guang Yang. "Fabrication and Formability of Continuous Carbon Fiber Reinforced Resin Matrix Composites Using Additive Manufacturing." Crystals 12, no. 5 (May 2, 2022): 649. http://dx.doi.org/10.3390/cryst12050649.

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In the current process for additive manufacturing of continuous carbon fiber reinforced resin matrix composites, the fiber and resin matrix are fed into the molten chamber, and then impregnated and compounded in the original position, and finally extruded and deposited on the substrate. It is difficult to control the ratio of fiber and resin, and to achieve good interface fusion, which results in an unsatisfactory enhancement effect. Therefore, an additive manufacturing process based on continuous carbon fiber reinforced polylactic acid composite prepreg filament was explored in this study. The effects of various process parameters on the formability of composites were studied through systematic process experiments. The results showed that the process parameters of additive manufacturing have a systematic influence on the forming quality, accuracy and efficiency, and on the mechanical properties of CFRP. Through the experimental optimization of various process parameters, a continuous and stable forming process was achieved when the nozzle aperture was 0.8 mm, the nozzle printing temperature was 240 °C, the substrate temperature was 60 °C, the wire feeding speed was 5 mm/s, the nozzle moving speed was 5 mm/s, the path bonding rate was 40%, and the printing layer thickness was 0.7 mm. Based on the optimized process parameters, direct additive manufacturing of a lightweight and high-strength composite cellular load-bearing structure could be realized. Its volume fraction of carbon fiber was approximately 7.7%, and the tensile strength was up to 224.3 MPa.

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Pérez, Mercedes, Gustavo Medina-Sánchez, Alberto García-Collado, Munish Gupta, and Diego Carou. "Surface Quality Enhancement of Fused Deposition Modeling (FDM) Printed Samples Based on the Selection of Critical Printing Parameters." Materials 11, no. 8 (August 8, 2018): 1382. http://dx.doi.org/10.3390/ma11081382.

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The present paper shows an experimental study on additive manufacturing for obtaining samples of polylactic acid (PLA). The process used for manufacturing these samples was fused deposition modeling (FDM). Little attention to the surface quality obtained in additive manufacturing processes has been paid by the research community. So, this paper aims at filling this gap. The goal of the study is the recognition of critical factors in FDM processes for reducing surface roughness. Two different types of experiments were carried out to analyze five printing parameters. The results were analyzed by means of Analysis of Variance, graphical methods, and non-parametric tests using Spearman’s ρ and Kendall’s τ correlation coefficients. The results showed how layer height and wall thickness are the most important factors for controlling surface roughness, while printing path, printing speed, and temperature showed no clear influence on surface roughness.

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Kong, Dekui, Yongcun Zhang, and Shutian Liu. "Convective heat transfer enhancement by novel honeycomb-core in sandwich panel exchanger fabricated by additive manufacturing." Applied Thermal Engineering 163 (December 2019): 114408. http://dx.doi.org/10.1016/j.applthermaleng.2019.114408.

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30

Ho, Minh Dai, and Sergey V. Muravyov. "Accuracy enhancement of measurand estimate on the base of additive combined measurements." Sensor Review 40, no. 3 (May 7, 2020): 377–83. http://dx.doi.org/10.1108/sr-01-2020-0009.

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Purpose The paper aims to develop a method for improving the accuracy of smart sensors (deemed as digital measuring instruments) by organizing combined measurements and processing their results by the parametric adjustment method at heterogeneous dispersion of the random error of the applied regression model. Design/methodology/approach When carrying out combined measurements, the problem of joint processing of measurement results of functionally related quantities must be solved. The function type can be known in advance or obtained experimentally. The number of combined measurements exceeds the number of unknown measured quantities. The redundant measurements can improve the accuracy of estimates of measured values but lead to inconsistency of the measurement results. The problem of inconsistency is solved by the parametric adjustment method, which is rather widely used mainly in the field of geodetic measurements, wherein the parametric equations are linear and the measured quantities are additive. Findings The proposed method allows to reduce the uncertainty of type B of a measurement result, caused by the maximum permissible error of a digital measuring instrument, by 1.2–4 times in comparison with the direct estimation method. Originality/value A compact description of the parametric adjustment method in matrix form is given. Recommendations are given on shaping a sensitivity matrix of functions for the proposed method. The geometric interpretation of the proposed method is considered. The results of the proposed method experimental testing are given when evaluating resistance values.

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Karande, Prasad, and Shankar Chakraborty. "Material Handling Equipment Selection Using Weighted Utility Additive Theory." Journal of Industrial Engineering 2013 (December 30, 2013): 1–9. http://dx.doi.org/10.1155/2013/268708.

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Better utilization of manpower, providing product flexibility, increasing productivity, decreasing lead time, reduction in handling cost, increased efficiency of material flow, and enhancement of production process are some of the most important issues influencing material handling (MH) equipment selection decision. As a wide variety of MH equipment is available today, selection of the proper equipment for a designed manufacturing system is a complicated task. Selection of suitable MH equipment for a typical handling environment is found to be a multicriteria decision-making (MCDM) problem. As the selection process is found to be unstructured, characterized by domain dependent knowledge, there is a need to apply an efficient MCDM tool to select the most suitable MH equipment for the given application. This paper applies weighted utility additive (WUTA) method to solve an MH equipment selection problem. The ranking obtained using the WUTA method is compared with that derived by the past researchers which proves its potentiality, applicability, and accuracy to solve complex decision-making problems.

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Choi, Youngsin, Hwi-Jun Kim, Gun-Hee Kim, Chang-Woo Lee, and Dong-Geun Lee. "Effect of Line Energy Conditions on Mechanical and Fatigue Properties of Ti6Al4V Fabricated by Electron Beam Additive Manufacturing." Metals 11, no. 6 (May 27, 2021): 878. http://dx.doi.org/10.3390/met11060878.

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Additive manufacturing has many process variables and requires additive process optimization. Line energy and scan speed are the main process variables. The objective of this work aims to investigate the effect of changes in line energy and scan speed among the process variables on the mechanical and fatigue properties of the Ti6Al4V specimens fabricated by electron beam additive manufacturing method. The size of the pore inside the specimen was 40~60 μm with the exception of the condition of 0.2 kJ/m, and the specimen with poor fusion of more than 100 μm and gas pore was found to have lower room temperature tensile and fatigue properties compared to the optimal process conditions. As line energy increased, strain hardening occurred, and yield strength and tensile strength increased. The EL:0.3 kJ/m and 800 mm/s condition is a process condition that shows no defects such as unmelted powder and poor fusion, and it represents the best fatigue strength of 400 MPa. The fatigue strength of the specimen performed with hot isostatic pressing after additive manufacturing was measured at 550 MPa, an increase of 150 MPa, which resulted in high fatigue strength enhancement. The crack initiation site and propagation behavior were analyzed by observing the fatigue fracture section of the specimen according to the line energy.

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Xiao, Xinyi, Byeong-Min Roh, and Feng Zhu. "Strength Enhancement in Fused Filament Fabrication via the Isotropy Toolpath." Applied Sciences 11, no. 13 (June 30, 2021): 6100. http://dx.doi.org/10.3390/app11136100.

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The fused filament fabrication (FFF) process deposits thermoplastic material in a layer-by-layer manner, expanding the design space and manufacturing capability compared with traditional manufacturing. However, the FFF process is inherently directional as the material is deposited in a layer-wise manner. Therefore, the in-plane material cannot reach the isotropy character when performing the tensile test. This would cause the strength of the print components to vary based on the different process planning selections (building orientation, toolpath pattern). The existing toolpaths, primarily used in the FFF process, are linear, zigzag, and contour toolpaths, which always accumulate long filaments and are unidirectional. Thus, this would create difficulties in improving the mechanical strength from the existing toolpath strategies due to the material in-plane anisotropy. In this paper, an in-plane isotropy toolpath pattern is generated to enhance the mechanical strength in the FFF process. The in-plane isotropy can be achieved through continuous deposition while maintaining randomized distribution within a layer. By analyzing the tensile strength on the specimens made by traditional in-plane anisotropy toolpath and the proposed in-plane isotropy toolpath, our results suggest that the mechanical strength can be reinforced by at least 20% using our proposed toolpath strategy in extrusion-based additive manufacturing.

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Rahim, Siti Lydia, and Shajahan Maidin. "Feasibility Study of Additive Manufacturing Technology Implementation in Malaysian Automotive Industry Using Analytic Hierarchy Process." Applied Mechanics and Materials 465-466 (December 2013): 715–19. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.715.

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Additive Manufacturing (AM) is the direct production of finished goods using additive fabrication techniques. AM done in parallel batch production can provide a large advantage in speed and cost. Currently, the efforts to utilize AM concept and technology have several problems particularly in Malaysian automotive industry. Such existing problems have discouraged the enhancement of process and product development of automotive industry. In providing the solution, by implementing AM technology, there is potential to speed up the development of automotive parts and move towards mass customization. Several issues have been discovered by discussion with PROTON. This paper presents the critical decision factors in implementing AM in Malaysian automotive industry. Analytic hierarchy process (AHP) is used to develop the framework of decision making in order to assess the factor affecting the AM implementation. The study shows that the main factors affects the implementations of AM are financial, technological, organization and design practice. The most important aspect to be considered is the investment cost. Finally, the information presented in this paper can also assist a potential user in choosing to implement or not to implement AM technology. Keywords:Additive Manufacturing, Analytic Hierarchy Process,Automotive Industry

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Rahim, Siti Lydia, and Shajahan Maidin. "Feasibility Study of Additive Manufacturing Technology Implementation in Malaysian Automotive Industry Using Analytic Hierarchy Process." Advanced Materials Research 903 (February 2014): 450–54. http://dx.doi.org/10.4028/www.scientific.net/amr.903.450.

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Additive Manufacturing (AM) is the direct production of finished goods using additive fabrication techniques. AM done in parallel batch production can provide a large advantage in speed and cost. Currently, the efforts to utilize AM concept and technology have several problems particularly in Malaysian automotive industry. Such existing problems have discouraged the enhancement of process and product development of automotive industry. In providing the solution, by implementing AM technology, there is potential to speed up the development of automotive parts and move towards mass customization. Several issues have been discovered by discussion with PROTON. This paper presents the critical decision factors in implementing AM in Malaysian automotive industry. Analytic hierarchy process (AHP) is used to develop the framework of decision making in order to assess the factor affecting the AM implementation. The study shows that the main factors affects the implementations of AM are financial, technological, organization and design practice. The most important aspect to be considered is the investment cost. Finally, the information presented in this paper can also assist a potential user in choosing to implement or not to implement AM technology. Keywords:Additive Manufacturing, Analytic Hierarchy Process,Automotive Industry

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Chiba, Hironao, Tatsuaki Furumoto, Yuki Hori, Makoto Nikawa, Nobuhisa Hayashi, and Mitsugu Yamaguchi. "Fabrication of Release Agent Supply Die with Porous Structure Using Metal-Based Additive Manufacturing." International Journal of Automation Technology 15, no. 6 (November 5, 2021): 868–77. http://dx.doi.org/10.20965/ijat.2021.p0868.

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In powder bed fusion (PBF), a type of metal-based additive manufacturing (AM) process, metal powders are deposited on a substrate and melted through selective laser-beam irradiation. Among AM processes, PBF yields excellent dimensional accuracy, and the built parts can be applied to molding dies and topology-optimized parts. Furthermore, PBF can be used to build porous structures. In this study, a highly functional die casting method was established using PBF, which involved a release agent supplied through the porous structure to the surface of the proposed die. The arrangement of the porous structure made it possible to apply the release agent to the deep groove, which is not possible using a spray as in conventional supply methods. The laser-irradiated area was visualized to confirm pore formation, and the building conditions of the porous structure suitable to supply the release agent were investigated. The resulting die casting characteristics were evaluated. Considering the obtained results, guidelines to build dies or molds for die casting with porous structures are recommended. The amount of release agent could be controlled at each position of the die casting die, and the melted Al alloy did not penetrate the porous structure. In addition, the obtained Al alloy casting did not exhibit any castability defects. Moreover, suitable control of the supply of the release agent enabled enhancement of the die casting characteristics.

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Semenova, Irina P., Yuri D. Shchitsyn, Dmitriy N. Trushnikov, Alfiz I. Gareev, Alexander V. Polyakov, and Mikhail V. Pesin. "Microstructural Features and Microhardness of the Ti-6Al-4V Alloy Synthesized by Additive Plasma Wire Deposition Welding." Materials 16, no. 3 (January 19, 2023): 941. http://dx.doi.org/10.3390/ma16030941.

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Wire arc additive manufacturing (AM) is able to replace the traditional manufacturing processes of Ti alloys. At the same time, the common drawback of Ti workpieces produced by AM via wire deposition welding is the formation of a coarse-grained dendritic structure, its strong anisotropy and, consequently, lower strength as compared to a monolithic alloy. In this work, a new method is proposed for the enhancement of the strength properties of the Ti-6Al-4V alloy synthesized by AM via wire deposition welding, which involves the use of a wire with an initial ultrafine-grained (UFG) structure. The UFG wire is characterized by a large number of defects of the crystalline lattice and grain boundaries, which will enable increasing the number of “crystallization centers” of the α-phase, leading to its refinement. The macro- and microstructure, phase composition and microhardness of the Ti-6Al-4V alloy samples were investigated. The microhardness of the alloy produced by layer-by-layer deposition welding using a UFG wire was shown to be on average 20% higher than that of the samples produced by a deposition welding using a conventional wire. The nature of this phenomenon is discussed, as well as the prospects of increasing the mechanical characteristics of Ti alloys produced by additive manufacturing.

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Cheng, Wen-Long, Kouichi Houda, Ze-Shao Chen, Atsushi Akisawa, Peng Hu, and Takao Kashiwagi. "Heat transfer enhancement by additive in vertical falling film absorption of H2O/LiBr." Applied Thermal Engineering 24, no. 2-3 (February 2004): 281–98. http://dx.doi.org/10.1016/j.applthermaleng.2003.08.013.

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Dizon, John Ryan C., Ciara Catherine L. Gache, Honelly Mae S. Cascolan, Lina T. Cancino, and Rigoberto C. Advincula. "Post-Processing of 3D-Printed Polymers." Technologies 9, no. 3 (August 25, 2021): 61. http://dx.doi.org/10.3390/technologies9030061.

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Additive manufacturing, commonly known as 3D printing, is an advancement over traditional formative manufacturing methods. It can increase efficiency in manufacturing operations highlighting advantages such as rapid prototyping, reduction of waste, reduction of manufacturing time and cost, and increased flexibility in a production setting. The additive manufacturing (AM) process consists of five steps: (1) preparation of 3D models for printing (designing the part/object), (2) conversion to STL file, (3) slicing and setting of 3D printing parameters, (4) actual printing, and (5) finishing/post-processing methods. Very often, the 3D printed part is sufficient by itself without further post-printing processing. However, many applications still require some forms of post-processing, especially those for industrial applications. This review focuses on the importance of different finishing/post-processing methods for 3D-printed polymers. Different 3D printing technologies and materials are considered in presenting the authors’ perspective. The advantages and disadvantages of using these methods are also discussed together with the cost and time in doing the post-processing activities. Lastly, this review also includes discussions on the enhancement of properties such as electrical, mechanical, and chemical, and other characteristics such as geometrical precision, durability, surface properties, and aesthetic value with post-printing processing. Future perspectives is also provided towards the end of this review.

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Abul-Hamayel, M. A., A. M. Aitani, and M. R. Saeed. "Enhancement of Propylene Production in a Downer FCC Operation using a ZSM-5 Additive." Chemical Engineering & Technology 28, no. 8 (August 2005): 923–29. http://dx.doi.org/10.1002/ceat.200407133.

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Mondal, Mounarik, Hrishikesh Das, Sung-Tae Hong, Byeong-Seok Jeong, and Heung Nam Han. "Local enhancement of the material properties of aluminium sheets by a combination of additive manufacturing and friction stir processing." CIRP Annals 68, no. 1 (2019): 289–92. http://dx.doi.org/10.1016/j.cirp.2019.04.109.

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Beltrán, Natalia, David Blanco, Braulio José Álvarez, Álvaro Noriega, and Pedro Fernández. "Dimensional and Geometrical Quality Enhancement in Additively Manufactured Parts: Systematic Framework and A Case Study." Materials 12, no. 23 (November 28, 2019): 3937. http://dx.doi.org/10.3390/ma12233937.

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In order to compete with traditional manufacturing processes, Additive Manufacturing (AM) should be capable of producing medium to large batches at industrial-degree quality and competitive cost-per-unit. This paper proposes a systematic framework approach to the problem of fulfilling dimensional and geometric requirements for medium batch sizes of AM parts, which has been structured as a three-step optimization methodology. Firstly, specific work characteristics are analyzed so that information is arranged according to an Operation Space (factors that could have an influence upon quality) and a Verification Space (formed by quality indicators and requirements). Standard process configuration leads to characterization of the standard achievable quality. Secondly, controllable factors are analyzed to determine their relative influence upon quality indicators and the optimal process configuration. Thirdly, optimization of part dimensional and/or geometric definition at the design level is performed in order to improve part quality and meet quality requirements. To evaluate the usefulness of the proposed framework under quasi-industrial condition, a case study is presented here which is focused on the dimensional and geometric optimization of surgical-steel tibia resection guides manufactured by Laser-Power Bed Fusion (L-PBF). The results show that the proposed approach allows for part quality improvement to a degree that matches the initial requirements.

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van der Elst, Louis, Camila Faccini de Lima, Meve Gokce Kurtoglu, Veda Narayana Koraganji, Mengxin Zheng, and Alexander Gumennik. "3D Printing in Fiber-Device Technology." Advanced Fiber Materials 3, no. 2 (February 8, 2021): 59–75. http://dx.doi.org/10.1007/s42765-020-00056-6.

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Abstract Recent advances in additive manufacturing enable redesigning material morphology on nano-, micro-, and meso-scale, for achieving an enhanced functionality on the macro-scale. From non-planar and flexible electronic circuits, through biomechanically realistic surgical models, to shoe soles individualized for the user comfort, multiple scientific and technological areas undergo material-property redesign and enhancement enabled by 3D printing. Fiber-device technology is currently entering such a transformation. In this paper, we review the recent advances in adopting 3D printing for direct digital manufacturing of fiber preforms with complex cross-sectional architectures designed for the desired thermally drawn fiber-device functionality. Subsequently, taking a recursive manufacturing approach, such fibers can serve as a raw material for 3D printing, resulting in macroscopic objects with enhanced functionalities, from optoelectronic to bio-functional, imparted by the fiber-devices properties. Graphic abstract

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Nagalingam, Arun Prasanth, Hemanth Kumar Yuvaraj, Vijay Santhanam, and S. H. Yeo. "Multiphase hydrodynamic flow finishing for surface integrity enhancement of additive manufactured internal channels." Journal of Materials Processing Technology 283 (September 2020): 116692. http://dx.doi.org/10.1016/j.jmatprotec.2020.116692.

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Sahoo, S. C., Amitava Sil, and Dharm Pal. "Effect of Nano-additive on the Bonding Strength and Formaldehyde Emission of the Plywood Adhesive during Manufacturing of Wood Based Panel Products." International Journal of Innovative Technology and Exploring Engineering 10, no. 2 (December 10, 2020): 158–61. http://dx.doi.org/10.35940/ijitee.b8306.1210220.

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Nano science and nano technology provides numerous opportunities for enhancing the properties of wood based panel products. In this study an extender was made using nano silicon dioxide ( Sio2), nano calcium carbonate( CaCo3) with some specialty chemicals at a certain reciprocal proportion. Efficacy study was carried out with both phenolic and amino resin in terms of rheological and formaldehyde emission test using reinforcement of nano additive as extender at different concentration level. The plywood panels has been tested as per IS: 1734-1983 for mechanical properties. The rheological and adhesive properties has been tested as per IS 848: 2006. The test data reveals that enhancement of rheological, bonding and mechanical properties have been achieved after reinforcement of synthetic resin. The increase in the percentage of nano-additive caused an increase of viscosity, glue shear strength and minimizing the formaldehyde emission than using individual nano silicon dioxide ( Sio2), nano calcium carbonate( CaCO3) instead of the extender made by combination of above. Using nano additive extender at 5%, there is an increase in glue shear strength in the glue line and enhanced rheological properties in amino resin based adhesive was observed.

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Zhao, Chenhao, Ningsong Qu, and Xiaochuan Tang. "Confined Electrochemical Finishing of Additive-Manufactured Internal Holes with Coaxial Electrolyte Flushing." Journal of The Electrochemical Society 168, no. 11 (November 1, 2021): 113504. http://dx.doi.org/10.1149/1945-7111/ac3782.

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Adhered powders and undesirable surface quality represent significant challenges for additive manufacturing (AM) technology. AM internal surface finishing is more difficult owing to the poor visibility of internal geometries and the inconvenient manipulation to machine tools. This paper proposed a confined electrochemical finishing process with a coaxial electrolyte flushing manner to remove the AM internal surface asperity. The insulation was conducted in the non-machining area of cathode to cease its electrochemical reaction which consumed the electric charge to generate gas bubbles, and the electrochemical dissolution could be confined within the AM internal hole. More intensive electrochemical dissolution was performed to the AM surface asperity and thus higher material removal and better surface finishing enhancement could be achieved. The coaxial electrolyte flushing manner created a uniform and efficient flow field to facilitate the discharge of electrolytic products. This technique could eliminate the partially melted powders adhered to the AM internal surface and reduce their Ra from 15.620 μm to 3.494 μm and Rz from 78.402 μm to 19.272 μm. The AM internal hole with a high aspect ratio of 10 could be well handled by this process to eliminate the adhered powders from its internal surface.

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Jue, Jiubin, and Dongdong Gu. "Selective laser melting additive manufacturing of in situ Al2Si4O10/Al composites: Microstructural characteristics and mechanical properties." Journal of Composite Materials 51, no. 4 (July 28, 2016): 519–32. http://dx.doi.org/10.1177/0021998316649251.

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The advanced selective laser melting technology was employed to prepare in situ Al based composites. Relationship among selective laser melting processing parameters, microstructures and resultant mechanical properties had been established. It turned out that in situ Al2Si4O10/Al composites were successfully fabricated by selective laser melting of Al2O3/AlSi10Mg composite powders. Due to the overlap between neighboring tracks and the remelting of previously solidified layers, two distinguished zones consisting of track core and track overlap were produced in laser induced melt pool. The two zones, respectively experienced different thermal histories, thus leading to the variation of cooling rate, which had a significant influence on the microstructural development and resultant mechanical performances. The track core mainly consisted of remarkably refined cellular dendritic Al matrix decorated with uniformly distributed ring-structured Al2Si4O10 reinforcements, while the track overlap was characterized with comparatively coarse columnar dendritic Al matrix as well as the coarse Al2Si4O10 reinforcements. At the optimal v of 500 mm/s, the obtained dynamic nanohardness ( H d) of track core ( H d = 3.79 GPa) and track overlap ( H d = 3.52 GPa) for selective laser melting processed composites part both showed tremendous enhancement upon that of unreinforced Al part ( H d = 0.58 GPa). The dry sliding wear tests indicated that the optimally prepared Al2Si4O10/Al composites part exhibited excellent wear performance with a considerably low coefficient of friction of 0.32 and a significantly reduced wear rate of 4.52 × 10−5 mm3 N−1 m−1. The formed consecutive protective adherent tribolayer on the worn surface and the significantly enhanced hardness of the composites well accounted for the superior wear performance.

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Ahn, Byungmin. "Microstructural Tailoring and Enhancement in Compressive Properties of Additive Manufactured Ti-6Al-4V Alloy through Heat Treatment." Materials 14, no. 19 (September 24, 2021): 5524. http://dx.doi.org/10.3390/ma14195524.

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Among laser additive manufacturing, selective laser melting (SLM) is one of the most popular methods to produce 3D printing products. The SLM process creates a product by selectively dissolving a layer of powder. However, due to the layerwise printing of metal powders, the initial microstructure is fully acicular α′-martensitic, and mechanical properties of the resultant product are often compromised. In this study, Ti-6Al-4V alloy was prepared using SLM method. The effect of heat treatment was carried out on as-built SLM Ti-6Al-4V alloy from 650–1000 °C to study respective changes in the morphology of α/α′-martensite and mechanical properties. The phase transition temperature was also analyzed through differential thermal analysis (DTA), and the microstructural studies were undertaken by optical microscopy (OM) and scanning electron microscopy (SEM). The mechanical properties were assessed by microhardness and compressive tests before and after heat treatment. The results showed that heat treated samples resulted in a reduction in interior defects and pores and turned the morphology of the α′-martensite into a lamellar (α + β) structure. The strength was significantly reduced after heat treatment, but the elongation was improved due to the reduction in columnar α′-martensite phase. An optimum set of strength and elongation was found at 900 °C.

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Altmann, Jürgen. "New Military Technologies: Dangers for International Security and Peace." Sicherheit & Frieden 38, no. 1 (2020): 36–42. http://dx.doi.org/10.5771/0175-274x-2020-1-36.

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New military technologies are being developed at a high pace, with the USA in the lead. Intended application areas are space weapons and ballistic missile defence, hypersonic missiles, autonomous weapon systems, and cyber war. Generic technologies include artificial intelligence, additive manufacturing, synthetic biology and gene editing, and soldier enhancement. Problems for international security and peace - arms races and destabilisation - will likely result from properties shared by several technologies: wider availability, easier access, smaller systems; shorter times for attack, warning and decisions; and conventional-nuclear entanglement. Preventive arms control is urgently needed.

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Linares-Alvelais, José, J. Figueroa-Cavazos, C. Chuck-Hernandez, Hector Siller, Ciro Rodríguez, and J. Martínez-López. "Hydrostatic High-Pressure Post-Processing of Specimens Fabricated by DLP, SLA, and FDM: An Alternative for the Sterilization of Polymer-Based Biomedical Devices." Materials 11, no. 12 (December 13, 2018): 2540. http://dx.doi.org/10.3390/ma11122540.

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In this work, we assess the effects of sterilization in materials manufactured using additive manufacturing by employing a sterilization technique used in the food industry. To estimate the feasibility of the hydrostatic high-pressure (HHP) sterilization of biomedical devices, we have evaluated the mechanical properties of specimens produced by commercial 3D printers. Evaluations of the potential advantages and drawbacks of Fused Deposition Modeling (FDM), Digital Light Processing (DLP) technology, and Stereolithography (SLA) were considered for this study due to their widespread availability. Changes in mechanical properties due to the proposed sterilization technique were compared to values derived from the standardized autoclaving methodology. Enhancement of the mechanical properties of samples treated with Hydrostatic high-pressure processing enhanced mechanical properties, with a 30.30% increase in the tensile modulus and a 26.36% increase in the ultimate tensile strength. While traditional autoclaving was shown to systematically reduce the mechanical properties of the materials employed and damages and deformation on the surfaces were observed, HHP offered an alternative for sterilization without employing heat. These results suggest that while forgoing high-temperature for sanitization, HHP processing can be employed to take advantage of the flexibility of additive manufacturing technologies for manufacturing implants, instruments, and other devices.

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Journal articles on the topic 'Enhancement additive manufacturing'

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