• Title, Summary, Keyword: Metallic filament

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Improvement on resolution of mono-filament wire (초음파 팬텀 내 모노필라멘트의 해상력 개선에 대한 연구)

  • Ma, Sang-Chull;Kong, Young-Kun
    • Journal of radiological science and technology
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    • v.26 no.2
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    • pp.49-56
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    • 2003
  • The purposes of this study are to improve the ultrasound resolution of various nylon and metallic mono-filament wires, therefore, it was tested that it analyze on nylon mono-filament wire of 0.1 mm in A Co.'s ultrasonic phantom and synthesis of C15 g tissue mimicking materials(TMM), analyze resolution of nylon and metallic mono-filament wires in water and TMM. The results obtained were summarized as follows: 1. Metallic mono-filament wire of 0.1 mm and nylon mono-filament wire of 0.12 mm, 180 denier showed that it cleared dot echo pattern. 2. Metallic and nylon mono-filament wire of 0.2 mm showed that it cleared comet tail echo by reverberation artifact. 3. Nylon and metallic mono-filament wire of 0.1 mm showed that it can used for dead zone and axial resolution test. 4. Nylon mono-filament wire compared with metallic mono-filament wire showed that it satisfy elasticity and construction. 5. Degree of hardness of na not changed mono-filament's echo textures.

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Design and Manufacturing of Composite Drive Shaft for Automobiles (자동차용 복합재료 드라이브샤프트 설계 및 성형 연구)

  • Kim, T.W.;Lee, S.K;Jun, E.J.;Kim, W.D.;Lee, D.G.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.1 no.3
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    • pp.109-117
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    • 1993
  • A carbon/epoxy composite drive shaft used for the power transmission of the automobiles with steel joints. Compared with the metallic drive shaft, the composite one has the weight saving of 50% with equivalent torsional strength and fatigue characteristics. In this study, the filament winding technique for the composite tube and composite/metal joining technique are estabilished. The performance test of the drive shaft is carried out. The optimal condition of the surface roughness of the steel adherend was $1.5{{\mu}m}$ to $2.5{{\mu}m}$, and the optimal condition of the bonding thickness was 0.15mm. Maximum torque and torsional stiffness of the composite drive shaft manufactured by filament winding process were found to be $210kg{\cdot}m$ and $18.5kg{\cdot}m/deg$, respectively.

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Metallic FDM Process to Fabricate a Metallic Structure for a Small IoT Device (소형 IoT 용 금속 기구물 제작을 위한 금속 FDM 공정 연구)

  • Kang, In-Koo;Lee, Sun-Ho;Lee, Dong-Jin;Kim, Kun-Woo;Ahn, Il-Hyuk
    • Journal of The Korea Internet of Things Society
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    • v.6 no.4
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    • pp.21-26
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    • 2020
  • An autonomous driving system is based on the deep learning system built by big data which are obtained by various IoT sensors. The miniaturization and high performance of the IoT sensors are needed for diverse devices including the autonomous driving system. Specially, the miniaturization of the sensors leads to compel the miniaturization of the fixer structures. In the viewpoint of the miniaturization, metallic structure is a best solution to attach the small IoT sensors to the main body. However, it is hard to manufacture the small metallic structure with a conventional machining process or manufacturing cost greatly increases. As one of solutions for the problems, in this work, metallic FDM (Fused depositon modeling) based on metallic filament was proposed and the FDM process was investigated to fabricate the small metallic structure. Final part was obtained by the post-process that consists of debinding and sintering. In this work, the relationship between infill rate and the density of the part after the post-process was investigated. The investigation of the relationship is based on the fact that the infill rate and the density obtained from the post-processing is not same. It can be said that this work is a fundamental research to obtain the higher density of the printed part.

Design of Filament Wound Composite Pressure Tanks (필라멘트 와인딩된 복합재 압력탱크의 설계 연구)

  • 김철웅;박재성;조인현;홍창선;김천곤
    • Composites Research
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    • v.15 no.1
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    • pp.9-20
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    • 2002
  • In this study, the design method of filament wound composite pressure tanks was established by using finite element analyses. Pressure tanks were designed with and without a load sharing metallic liner. A GUI(graphic user interface) program was developed to increase the efficiency of analyses. The replacement ratio was defined in order to replace a metal pressure tank with a composite one. Finally, the best design model that is satisfied with design requirements was suggested.

KSR-III 복합재 가압탱크의 설계 및 제작

  • Kong, Cheol-Won;Yoon, Chong-Hoon;Jang, Young-Soon;Yi, Yeong-Moo
    • Aerospace Engineering and Technology
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    • v.2 no.2
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    • pp.124-132
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    • 2003
  • This paper described the structural design and the fabrication procedure of KSR-III composite pressure tank. The type of the composite pressure tank was COPV(Composite Overwrapped Pressure Vessel). A non-load sharing liner was made of aluminum 6061-0 and the liner provided a helium gas seal. The composite pressure tank was winded using T700 carbon/epoxy on the liner. Because the aluminum liner was thin, multiple cure cycles were applied to the filament winding technique. The multiple cure cycles prevented the liner-cylinder from losing a circular shape. A fitting force at the metallic boss was spread to the carbon fiber by a boss ring. The boss ring also prevented a local deformation at the boss part.

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Development of a Composite Rotor for Flywheel Energy Storage System (플라이휠 에너지 저장 장치용 복합재 로터 개발)

  • Kim, Myung-Hun;Han, Hun-Hee;Kim, Jae-Hyuk;Kim, Seong-Jong;Ha, Seong-Gyu
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.169-172
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    • 2005
  • A flywheel system is an electromechanical energy storage device that stores energy by rotating a rotor. The rotating part, supported by magnetic bearings, consists of the metallic shaft, composite rims of fiber-reinforced materials, and a hub that connects the rotor to the shaft. The delamination in the fiber wound composite rotor often lowered the performance of the flywheel energy storage system. In this work, an advanced hybrid composite rotor with a split hub was designed to both overcome the delamination problem in composite rim and prevent separation between composite rim and metallic shaft within all range of rotational speed. It was analyzed using a three-dimensional finite clement method. In order to demonstrate the predominant perfom1ance of the hybrid composite rotor with a split hub, a high spin test was performed up to 40,000 rpm. Four radial strains and another four circumferential strains were measured using a wireless telemetry system. These measured strains were in excellent agreement with the FE analysis. Most importantly, the radial strains were reduced using the hybrid composite rotor with a split hub, and all of them were compressive. As a conclusion, a compressive pressure on the inner surface of the proposed flywheel rotor was achieved, and it can lower the radial stresses within the composite rotor, enhancing the performance of the flywheel rotor.

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A larger nonvolatile bipolar resistive switching memory behaviour fabricated using eggshells

  • Zhou, Guangdong;Sun, Bai;Zhou, Ankun;Wu, Bo;Huang, Haishen
    • Current Applied Physics
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    • v.17 no.2
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    • pp.235-239
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    • 2017
  • Resistive random access memory (RRAM) devices have emerged as promising candidates for near future nonvolatile information storage. Eggshells, a food waste, have not been focused and recycled sustainably today. Eggshell-based devices have shown a large resistive-switching(RS) memory behaviors with favorable resistance ratio of ${\sim}10^3$, larger memory window of ~3.5 V, and high endurance and retention performance. Redox-based Ag filament models involving the formation and rupture of the metallic conduction filaments between top and bottom electrodes are proposed to interpret the large nonvolatile bipolar RS memory behaviors. This discovery provides for the possibility of an environmentally friendly, low-cost and sustainable material application in the next-generation nonvolatile date storage device.