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17. Application of Additive Manufacturing Technology for Chair Parts Connections.

Author

Nicolau, Antoniu, Pop, Mihai Alin, Georgescu, Sergiu Valeriu, and Coșereanu, Camelia

Subjects
SELECTIVE laser sintering, FINISHES & finishing, EUROPEAN larch, BENDING moment, MECHANICAL failures, ADHESIVES
Abstract

Additive manufacturing (AM) is a potential technology to be applied for replacing wood joints in the furniture industry. Overall, 3D-printed connectors have a lot of advantages in chair construction: the possibility of improving the design by using colored materials and new concepts with no limits of shape and size, avoiding the use of synthetic materials such as adhesives and finishing materials. The present research shows the results of the research conducted on 3D-printed connectors for a chair leg-stretchers joint. Larch (Larix decidua Mill.) wood was used for chair components and selective laser sintering (SLS) technology was employed for the 3D-printing connector designed to assemble the chair elements. Diagonal tensile and compression tests were performed on the L-type joints with 3D-printed connectors and the bending moments were determined and compared to the results obtained after testing the leg-stretchers mortise–tenon joints made of larch wood, taken as a reference. Micrograph investigation was finally performed on the broken areas of the 3D-printed connectors as a result of mechanical testing failures. The results show that the SLS printing technology applied to build the connector does not ensure enough strength to the assembly, and changes in printing parameters are needed for further research, in terms of laser power and scan speed. [ABSTRACT FROM AUTHOR]

Published
2023
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18. DESIGN, ACOUSTIC PERFORMANCE AND ADDITIVE MANUFACTURING OF HELICOPTER ROTOR BLADES WITH UNCONVENTIONAL SHAPES.

Author

Badicu, Gabriela-Alexandra, Zaharia, Sebastian-Marian, and Pop, Mihai Alin

Subjects
HELICOPTERS, ROTORS (Helicopters), HONEYCOMB structures
Abstract

In this paper, a blade with unconventional structure, corrugations and BERP tip, used in UAV helicopters, was designed, analyzed and additively manufactured. Aerodynamically, the unconventional blade shows better performance compared to the conventional blade at positive angles of attack. Acoustically, the unconventional blade showed a reduced noise level compared to the conventional blade. Acoustic testing of additively manufactured samples with five honeycomb core configurations showed higher performance for the 1.5 mm honeycomb cell samples 3D printed from T-PLA. [ABSTRACT FROM AUTHOR]

Published
2023

30. DESIGN AND ANALYSIS OF 3D PRINTING BLADES FOR AN UNMANNED AERIAL VEHICLE HELICOPTER.

Author

Urloiu, Anişoara-Valentina, Zaharia, Sebastian-Marian, and Pop, Mihai-Alin

Subjects
THREE-dimensional printing, DRONE aircraft, HELICOPTERS, GLASS fibers, ROTORS (Helicopters), MANUFACTURING defects
Abstract

Unmanned aerial vehicle helicopters are developing in recent years because they have better capabilities compared to unmanned aerial vehicle aircraft in terms of take-off and landing phase and controllability in areas with more difficult access. In this paper a helicopter blade was designed, aerodynamically and also by the finite element method analyzed, manufactured using 3D printing process. From the finite element analysis, it was observed that the blade will withstand the applied loadings, but also in flight of the unmanned aerial vehicle. The 3D printing of the blade was carried out in sections and after gluing, a blade made of polypropylene with 30% short glass fibres resulted. The microhardness of the blade is influenced by the proximity to the print bed and the 3D printing supports. Thus, both Shore D microhardness and Vickers microhardness showed higher values in proximity to the print bed. Microscopic analysis showed that the short glass fibre filament did not exhibit manufacturing defects, while conventional 3D printing defects such as voids and inter-track voids were found when 3D printing the blade sections. [ABSTRACT FROM AUTHOR]

Published
2023

31. Effect of concentrated solar energy on microstructure evolution of selective laser melted Ti-6Al-4V alloy

Author

Chicos, Lucia-Antoneta, primary, Zaharia, Sebastian Marian, additional, Cempura, Grzegorz, additional, Kruk, Adam, additional, Lech, Sebastian, additional, Kryshtal, Oleksandr, additional, Ziętara, Maciej, additional, Michta, Grzegorz, additional, Rodríguez, Jose, additional, Cosnita, Mihaela, additional, Pop, Mihai Alin, additional, and Lancea, Camil, additional

Published
2021
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33. Microstructure and micro-hardness analyses of titanium alloy Ti-6Al-4V parts manufactured by selective laser melting

Author

Lancea Camil, Chicos Lucia-Antoneta, Zaharia Sebastian Marian, and Pop Mihai Alin

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Selective Laser Melting (SLM) is one of the powder based additive manufacturing technologies and it is, as well, the most rapidly growing technique in Rapid Prototyping. In this paper is presented a microstructure analysis using Scanning Electron Microscope (LEO 1525 SEM), of Ti6Al4V parts exposed into a corrosion environment. The corrosion environment was generated using a salt chamber with 5% and 10% NaCl concentration and an ACS-Sunrise climatic chamber. The parts were also subjected to tests in order to determine their micro-hardness, followed by a statistical processing of the obtained data. The parts, having a lattice structure, were built on a Selective Laser Melting machine.

Published
2017
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47. MISSION MANAGEMENT FOR AN AUTOMATED PILOT SYSTEM MOUNTED ON A FIXED-WING TWIN-ENGINE AIRPLANE UAV.

Author

BUICAN, George Răzvan, ZAHARIA, Sebastian-Marian, PASCARIU, Ionut Stelian, CHICOS, Lucia-Antoneta, LANCEA, Camil, POP, Mihai Alin, and STAMATE, Valentin-Marian

Subjects
AIRPLANES, MARKET entry
Abstract

UAV systems used automated pilots which can be configured based on the mission. The entry level market for this type of systems is not focus mainly on fixed-wing configurations. On this paper we asses, develop and simulate missions for an automated piloting system, built on a Cube Orange architecture. The flight controller is mounted on a fixed-wing twin-engine airplane built using additive manufacturing technologies. For the management and simulation of UAV mission we use Mission Planner, and open-source software from ArduPilot. The missions is simulated to obtain an improvement of the automated piloting system, evaluate the terrain from the flight path, avoid dangers, keep out of restricted areas and find the optimal routes. [ABSTRACT FROM AUTHOR]

Published
2022
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48. DEVELOPMENT AND IMPLEMENTATION OF AN AUTOMATED PILOT SYSTEM FOR A FIXED-WING TWIN-ENGINE AIRPLANE UAV.

Author

BUICAN, George Răzvan, ZAHARIA, Sebastian-Marian, PASCARIU, Ionut Stelian, CHICOS, Lucia-Antoneta, LANCEA, Camil, POP, Mihai Alin, and STAMATE, Valentin-Marian

Subjects
EARTH stations, AIRPLANES, SYSTEMS development, CUBES, DRONE aircraft
Abstract

When controlling a UAV, we have to rely on the line of site of the operator and aft wards on the communication with the ground control station. This implies expensive equipment used in communication, a skilled operator and a UAV with low autonomy. In order to address these issues an automated piloting system needs to be implemented thus offering the needed autonomy to the UAV. An automated pilot can also stabilize the aircraft and allow for the control of the UAV to be done by people without intensive training or special skills. In the present paper we present the development and implementation of such a system, built on Cube Orange flight controller, and implemented on a fixed-wing UAV with twin-engines, fabricated using additive manufacture technologies. [ABSTRACT FROM AUTHOR]

Published
2022
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49. Ti-Zr-Si-Nb Nanocrystalline Alloys and Metallic Glasses: Assessment on the Structural Development, Thermal Stability, Corrosion and Mechanical Properties

Author

Gabor, Camelia, Cristea, Daniel, Velicu, Ioana-Laura, Bedo, Tibor, Gatto, Andrea, Bassoli, Elena, Varga, Bela, Pop, Mihai Alin, Geanta, Victor, Stefanoiu, Radu, Codescu, Mirela Maria, Manta, Eugen, Patroi, Delia, Florescu, Monica, Munteanu, Sorin Ion, Ghiuta, Ioana, Lupu, Nicoleta, and Munteanu, Daniel

Subjects
biocompatibility, melt spinning, amorphous titanium alloy, thermal stability
Abstract

The development of novel Ti-based amorphous or &beta, phase nanostructured metallic materials could have significant benefits for implant applications, due to potentially improved corrosion properties, and mechanical characteristics (lower Young&rsquo, s modulus, better wear performance, improved fracture toughness) in comparison to the standardized &alpha, +&beta, titanium alloys. Moreover, the devitrification phenomenon, occurring during heating, could contribute to lower input power during additive manufacturing technologies. Ti-based alloy ribbons were obtained by melt-spinning, considering the ultra-fast cooling rates this method can provide. The titanium alloys contain Zr, Nb, and Si (Ti60Zr10Si15Nb15, Ti64Zr10Si15Nb11, Ti56Zr10Si15Nb19) in various proportions. These elements were chosen due to their reported biological safety, as in the case of Zr and Nb, and the metallic glass-forming ability and biocompatibility of Si. The morphology and chemical composition were analyzed by scanning electron microscopy and energy-dispersive X-ray spectroscopy, while the structural features (crystallinity, phase attribution after devitrification (after heat treatment)) were assessed by X-ray diffraction. Some of the mechanical properties (hardness, Young&rsquo, s modulus) were assessed by instrumented indentation. The thermal stability and crystallization temperatures were measured by differential thermal analysis. High-intensity exothermal peaks were observed during heating of melt-spun ribbons. The corrosion behavior was assessed by electrocorrosion tests. The results show the potential of these alloys to be implemented as materials for biomedical applications.

Published
2019
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