• Title/Summary/Keyword: Bending

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Fabrication or Bending Actuator Using Shape Memory Alloy and Basic Experiment or Control (형상기억합금을 이용한 bending 액츄에이터의 제작 및 컨트롤을 위한 기초실험)

  • Kim, M.S.;Choi, N.B.;Kim, D.W.;Lee, S.H.;Lee, S.K.
    • Proceedings of the KOSOMBE Conference
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    • v.1997 no.11
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    • pp.497-500
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    • 1997
  • In this paper, we proposes a bending actuator using shape memory alloy coil-type springs. By the heating of two shape memory alloy coil-type springs sequentially, the bending and stretching motion of the actuator is possible. We measure the bending angle and repeated bending motion with the various currents. Furthermore, we control the bending angle of the 1 directional bending actuator with sensors. The performance of the actuator has been characterized or the possible application for catheter.

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A Study on the Design of Three-Dimensional Bending Machine (3차원 Bending Machine 설계에 관한 연구)

  • Lee, Choon-Man;Lim, Sang-Heon;Park, Dong-Keun
    • Proceedings of the KSME Conference
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    • pp.1852-1857
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    • 2003
  • This study is concerned about the development of three-dimensional bending machine for heat exchanger. Recently, three-dimensional bending is required for various heat exchanger. The purpose of this study is design of three-dimensional bending machine by analysis of bending process and structural analysis simulation. The analysis is carried out by FEM simulation using DEFORM and CATIA V5 software. The copper-tube is modeled by shell elements and the machine is modeled by placing proper shell and solid finite elements and fictitious mass properties to represent the real one. The final results of analysis are applied to the design of three-dimensional bending machine and the machine is successfully developed.

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Static Bending 영향에 따른 Ti/Au의 전기적 특성 변화

  • Kim, Sang-Seop;Choe, Byeong-Deok
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.370.2-370.2
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    • 2014
  • 본 연구에서는 Bending 시간에 따른 Ti/Au의 전기적 특성 변화에 대한 실험을 진행하였다. 전기적 특성을 평가하기 위해 PET 기판 위에 Ti/Au을 Greek Bridge와 Line Bridge를 합친 Cross Bridge 형태로 증착하였고, Cross Bridge의 Line을 bending하여 시간 경과에 따른 정적인(static) bending 영향을 확인하였다. Bending은 0~100시간까지 진행하였고, Line의 width를 200, 400, 800, $1000{\mu}m$로 가변하여 시간에 따른 비저항의 변화를 측정하였다. 실험결과 Bending시간이 길어짐에 따라 비저항이 감소하였고, 일정시간에서 크게 감소하며, 그 이후에는 포화되는 경향을 보였다. 또한 Width가 증가함에 따라 비저항의 변화가 컸다. 800 um, $1000{\mu}m$에서는 bending 직후 비저항이 초기대비 약 90%까지 떨어졌으며 100시간 후에는 80%까지 감소하였다. 100시간 뒤 Width에 따라 초기대비 비저항이 78%~91%까지 감소하는 것을 확인하였다.

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Development of an AFM-Based System for Nano In-Process Measurement of Defects on Machined Surfaces (가공면미세결함의 나노 인프로세스 측정을 위한 AFM시스템의 개발)

  • Gwon, Hyeon-Gyu;Choe, Seong-Dae;Park, Mu-Hun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.3
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    • pp.537-543
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    • 2002
  • This paper examines a new in-process measurement system for the measurement of micro-defects on the surfaces of brittle materials by using the AFM (Atomic Force Microscopy). A new AFM scanning stage that can also perform nano-scale bending of the sample was developed by adding a bending unit to a commercially available AFM scanner. The bending unit consists of a PZT actuator and sample holder, and can perform static and cyclic three-point bending. The true bending displacement of the bending unit is approximately 1.8mm when 80 volts are applied to the PZT actuator. The frequency response of the bending unit and the stress on the sample were also analyzed, both theoretically and experimentally. Potential surface defects of the sample were successfully detected by this measurement system. It was confirmed that the number of micro-defects on a scratched surface increases when the surface is subjected to a cyclic bending load.

Behavior of Global Bending Distortion of Hatch-cover in Container Carrier during Fabrication Process (컨테이너 운반선 해치-커버 제작시 전 굽힘 변형 거동에 관한 연구)

  • Lee, Dong-Ju;Kim, Gyung-Gyu;Shin, Sang-Beom
    • Journal of Welding and Joining
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    • v.28 no.4
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    • pp.41-48
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    • 2010
  • The purpose of this study is to establish the control method of the global bending distortion caused by fabrication process of hatch-cover in a container ship. In order to do it, the transitional behavior of global bending distortion in the deck of hatch-cover during fabrication process was measured by 3-dimensional measuring instrument. From the results, the principal factor controlling the global bending distortion was identified as the bending moment associated with the longitudinal shrinkage force and transverse shrinkage caused by welding and flame heating and the change of the centroid axis of hatch-cover in each fabrication process. Therefore, in this study, with the predictive equations of the longitudinal shrinkage force and transverse shrinkage caused by welding and flame heating and the simplified thermo elastic method, the predictive method for the global bending distortion was established and verified by comparing with the measured result. Based on the results, the amount of reverse bending distortion of main stiffeners was determined to prevent the global bending distortion of hatch-cover.

Fiber-optic macro-bending sensor aided by metal capillary (매크로 벤딩 측정을 위한 금속 모세관 결합 광섬유 센서)

  • 백승인;정윤찬;이병호
    • Korean Journal of Optics and Photonics
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    • v.12 no.4
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    • pp.289-293
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    • 2001
  • A metal capillary splice fiber-optic sensor was fabricated for use as an intensity-based macro-bending sensor. As the radius of curvature due to the macro-bending decreases, the angular misalignment of the fiber ends inside the metal capillary increases, i.e., the coupling efficiency of the fiber splice is reduced. Thus, macro-bending can be detected by the measurement of the reduction of transmitted power. The detectable range of macro-bending. was measured approximately from 20 mm to 85 mm. The center wavelengths of the fiber Bragg gratings are 1543.3 nm and 1549.5 nm, respectively. The maximum bending loss of this sensor was measured about -11.92 dB. Using this metal capillary spliced fiber sensor and fiber Bragg gratings, macro-bending detection has been demonstrated, and it is shown to have potential for multi-point macro-bending sensors. nsors.

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The Bending and Compression Strength Properties in Rhus verniciflua(I) (한국산 옻나무의 휨 및 종압축 강도적 성질(I))

  • Byeon, Hee-Seop;Shimada, Masahiro;Fushitani, Masami
    • Journal of the Korean Wood Science and Technology
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    • v.24 no.1
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    • pp.95-99
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    • 1996
  • The bending and compression strength properties of two types Rhus verniciflua specimens, which made of no heat-treated wood and heat-treated wood for urushiol extraction, were measured. The heat-treated specimens were finger-jointed with either resorcinol-phenol or polyurethane resin adhesives, and the vertical type bending strength property was also measured in these specimens. The results obtained are as follows ; 1. The correlation coefficient between the compression strength and specific gravity in the specimens of no heat-treated and heat-treated wood was high. However there was no difference in compression strength property as affected by heat treatment. 2 The correlation coefficient between the bending strength and specific gravity in the specimens of no heat-treated and heat-treated wood was also high. However, there was no difference in bending strength property as affected by heat treatment. 3 The bending test showed high correlation between modulus of elasticity and modulus of rupture for the specimens made of no heat-treated and heat-treated wood. However, there was no difference in bending strength property between the specimens made of heat-treated and no heat-treated wood. 4. The efficiencies of bending strength test on the finger-jointed specimens of heat-treated wood with resorcinol-phenol and polyurethane resin adhesives were 0.85, 0.81. respectively.

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The Effects of Hardness and Thickness of Midsole on the Bending Properties of Footwear (미드솔의 경도 및 두께가 스포츠화의 굽힘 특선에 미치는 영향)

  • Park, Cha-Cheol
    • Elastomers and Composites
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    • v.41 no.2
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    • pp.125-130
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    • 2006
  • To understand the effect of midsole on the bending stiffness of footwear, bending moment is studied with various hardness and thickness of polyurethane(PU) and poly(ethyl one-co-vinylacetate)(EVA) foams which composed in footwear midsole. The initial bending moment of footwear was appeared at $19^{\circ}$ on bending angle of footwear, and this bending angle was not depend on thickness and hardness of midsole. The bending moments of footwear were also increased with increase of the hardness and thickness of misole which were composed in footwear. Increased hardness and increased thickness of foam and midsole also cause a greater bending moment of the sports shoe, respectively.

A Study on the Bending Collapse at the Open Cross-Section Members with Experiment and Analysis (열린 단면 부재의 굽힘 붕괴 실험 및 해석에 관한 연구)

  • 이승철;강신유
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.4
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    • pp.132-139
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    • 2004
  • The open section members have been used as the members of vehicle such as automotives, airplanes and trains. When vehicles are crashed, these members have absorption of the energy and it is necessary for retainment of the survival space, and as the result, the prediction for the displacement of members in this case of the crash of vehicles is very important. The displacements of members in this case of the crash of automotives show combined aspect of both axial collapse and bending collapse. In the rollover accident when bending collapse happen, the collapse of each members is progressed by the plastic hinge which made from bending moment, and therefore the research for the behavior of members under bending moment after collapse is necessary to determine the internal energy which the members can absorb and the deformed shapes of the members on the step of design. In this paper, the characteristics of bending collapse at the members of the open cross-section were studied with experiment and numerical analysis. We made a comparative studied of the result of the experiment, and changed the axis according to the parallel-axis theorem.

Auto-Bending Manufacturing System for Boiler Tubes (보일러 튜브 자동벤딩 생산시스템 개발)

  • Lee, Hyun-Soo;Kang, Moon-Hyun;Park, Jun-Kon;Hur, Kwan;Sung, Joon-Suk;Heo, Wang-Soon
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.450-454
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    • 1997
  • This system is the automatic boiler tube bending equipment which has four heads for bending the tube and the carriage for moving the tube. The system consists of two frames for transporting each moving parts, high-frequency heating equipment for heating the tube in hot bending, control panel for inputting the job data operating, remote control unit for concetration and distribution of input/output, and the monitoring system which can establish unmanned operationby receiving the bending job data via LAN form a design teamwhich produces the job data and schedule based on master production plan and diagnoses bending data change, input, whole system status, and system malfunctions. By employing this system, 30% of production improvement was achieved was achieved comparing to the existing bending system.

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