• Title/Summary/Keyword: Carbon fiber plate

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Effect of Carbon Fiber on Electrical and Mechanical Properties of Epoxy/Graphite Bipolar Plate (에폭시/Graphite계 Bipolar Plate의 전기적, 물리적 성질에 미치는 Carbon Fiber의 영향)

  • Choi, Bum-Choul;Lee, J.J.;Lee, Jae-Young;Park, Yunkyeong;Lee, Hong-Ki
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.92.1-92.1
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    • 2011
  • 고분자 전해질 연료전지 (PEMFC)의 핵심 부품 중의 하나인 Bipolar Plate (분리판)을 제조하기 위해서 고분자/그라파이트 복합재료를 사용하였다. 고분자 매트릭스로는 경화시 뛰어난 화학적, 기계적 특성을 갖는 에폭시를 채택하였고, 전기 전도성을 부여하기 위해 그라파이트를 도입하였으며, 에폭시 수지의 내충격성을 향상시키기 위해서 Carbon Fiber를 채택하였다. 에폭시 분말과 그라파이트 분말, 그리고 1cm 정도의 길이를 갖는 Carbon Fiber을 믹서에 넣고 균일하게 혼합하였다. 이 혼합물을 이형제 처리된 몰드에 주입하고, Hot Press를 사용하여 가열, 가압 ($150^{\circ}C$, 4 ton/$cm^2$, 2시간)하면서 경화시켰다. 일정 비율로 고정된 에폭시/그라파이트 계에 Carbon Filber의 혼합 비율을 변화시키면서 전기적, 물리적 성질의 변화를 연구하였다.

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Structural behavior of R/C Slabs Strengthened with Steel Plate, Carbon fiber sheets, and Carbon Fiber Laminate. (강판, 탄소섬유쉬트, 탄소섬유판으로 휨보강된 철근콘크리트 슬래브의 구조적 거동)

  • Lee, Young-Jea;Moon, Heui-Jeung;Lee, Kyung-Un;Chung, Lan;Jung, Sang-Jin
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04b
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    • pp.601-606
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    • 1998
  • In recent years, strengthening by steel plate, carbon fiber sheets, and carbon fiber laminate in spotlighted in order to repair and rehabilitation of R/C slabs. In this study, 3 method of rehabilitation are analyzed from the tests. Test parameters are the width of cracks, the method of repair and rehabilitation, the magnitude of pre-load. Deflection, failure load, strains of reinforcing bar, strains of sheet and plates are measured during tests. The failure mode and separption load analyzed from these measured data.

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Structural behavior of R/C Beam Strengthened with Steel Plate, Carbon Fiber Sheets, and Carbon Fiber Laminate. (강판, 탄소섬유쉬트, 탄소섬유판으로 휨보강된 천근콘크리트보의 구조적 거동)

  • Lee, Young-Jea;Moon, Heui-Jeung;Lee, Kyung-Un;Jung, Sang-Jin;Chung, Lan
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.10a
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    • pp.691-696
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    • 1997
  • In recent years, stengthening of beam by steel plate, carbon fiber sheets, and carbon fiber laminate is spotlighted in order to repair and rehabilitation of R/C structures. In this study, 3 method of rehabilitation technic are analyzed from the tests. Test parameters are the width of cracks, the method of repair and rehabilitation, the magnitude of existing load. Deflection, failure load, strains of reinforcing bar, strains of sheet and plates are measured during tests. The failure mode and ultimate load are analyzed from these measured data. Test result shows that the width of cracks and the magnitude of existing load do not make any difference of ultimate flexural capacity.

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Effect of Surface-Modified Carbon Fiber on the Mechanical Properties of Carbon/Epoxy Composite for Bipolar Plate of PEMFC (표면처리 탄소섬유가 PEMFC용 탄소/에폭시 복합재료 분리판의 기계적 강도에 미치는 영향)

  • LEE, HONGKI;HAN, KYEONGSIK
    • Transactions of the Korean hydrogen and new energy society
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    • v.31 no.1
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    • pp.49-56
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    • 2020
  • Epoxy/carbon composite was used to prepare a bipolar plate for polymer electrolyte membrane fuel cell (PEMFC). Phenol novolac-type epoxy and diglycidyl ether of bisphenol A (DGEBA)-type epoxy mixture was used as a matrix and graphite powder, carbon fiber (CF) and graphite fiber (GF) were used as carbon materials. In order to improve the mechanical properties of the bipolar plate, surface-modified CF was incorporated into the epoxy/carbon composite. To determine the cure temperature of the epoxy mixture, differential scanning calorimetry (DSC) analysis was performed and the data were introduced to Kissinger equation in order to get reaction activation energy and pre-exponential factor. Tensile and flexural strength was obtained by using universal testing machine (UTM). The surface morphology of the fractured specimen and the interfacial morphology between epoxy matrix and CF or GF were observed by a scanning electron microscopy (SEM).

Flexural Strengthening Effect on R.C Beam with Structural Damage (구조적 손상을 입은 R.C보의 휨보강 효과)

  • Kim, Sung-Yong;Han, Duck-Jeon;Shin, Chang-Hoon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.8 no.1
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    • pp.147-156
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    • 2004
  • The Rehabilitation and repair of structurally deteriorated, reinforced concrete structures will be highly demanded in the near future. The purpose of this study is to investigate whether damaged beams that crack and deflection are developed by bending moment are restored to the former state. In conclusion, when specimens strengthened with Steel Plate, CFS(Carbon Fiber Sheet) and CFRP-Grid(Carbon Fiber Reinforced Plastic-Grid) are compared with standard specimen, flexural capacity is increased and ductility and energy absorbtion capacity are similar with undamaged specimen. Therefore Steel Plate, CFS(Carbon Fiber Sheet) and CFRP-Grid (Carbon Fiber Reinforced Plastic-Grid) have highly efficiency as material of flexural strengthening.

Effect of Carbon Fiber Filament and Graphite Fiber on the Mechanical Properties and Electrical Conductivity of Elastic Carbon Composite Bipolar Plate for PEMFC (PEMFC용 탄성 탄소 복합재료 분리판의 기계적 강도 및 전기전도도에 미치는 탄소섬유 필라멘트와 흑연 섬유의 영향)

  • Lee, Jaeyoung;Lee, Wookum;Rim, Hyungryul;Joung, Gyubum;Lee, Hongki
    • Transactions of the Korean hydrogen and new energy society
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    • v.25 no.2
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    • pp.131-138
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    • 2014
  • Highly conductive bipolar plate for polymer electrolyte membrane fuel cell (PEMFC) was prepared using phenol novolac-type epoxy/graphite powder (GP)/carbon fiber filament (CFF) composite, and a rubber-modified epoxy resin was introduced in order to give elasticity to the bipolar plate graphite fiber (GF) was incorporated in order to improve electrical conductivity. To find out the cure condition of the mixture of novolac-type and rubber-modified epoxies, differential scanning calorimetry (DSC) was carried out and their data were introduced to Kissinger equation. And tensile and flexural tests were carried out using universal testing machine (UTM) and the surface morphology of the fractured specimen and the interfacial bonding between epoxy matrix and CFF or GF were observed by a scanning electron microscopy (SEM).

An Experimental Comparison Study on the Strength and Earthquake-resistant Capacity of Reinforced Concrete Columns Retrofitted with Fiber-Steel Composite Plate (복합플레이트로 보강된 RC 기둥의 내진성능에 대한 연구)

  • Park Tae Man;Park Weon Su;Park Seong Min;Yoon Jeong Bae
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.05a
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    • pp.724-729
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    • 2004
  • The purpose of this study is to investigate the strength and ductility improvement of columns retrofitted with Fiber-Steel Composite Plate, compared with Steel Plate, and Carbon Fiber Sheet. Test specimens strengthened with 3 different materials--- carbon fiber sheet, steel plate and fiber-steel composite plate --- were tested under cyclic lateral force and a constant axial load equal to $20\%$ of the column's axial load capacity. The hypothetical equivalent value of the strengthening among three materials is introduced to evaluate.

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Development of Multi-Degree of Freedom Carbon Fiber Plate Force/Torque Sensor (다자유도 탄소섬유판 힘/토크 센서 개발)

  • Lee, Dong-Hyeok;Kim, Min-Gyu;Cho, Nahm-Gyoo
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.2
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    • pp.170-177
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    • 2012
  • A force/torque sensor using carbon fiber plate was designed and developed to make the sensor be able to measure a wide range of multi degree of force and torque. Using carbon fiber plate of 0.3 mm thickness, the sensor was designed and developed, which has a ${\mu}N$ level order of resolution and about 0.01 N ~ 390 N of wide measurement range. The elastic deformation part has a tripod plate structure and strain gauges are attached on the part to detect the force/torque. The coefficient of determination for the sensor is over 0.955 by the calibration experiment so that the linearity of the sensor is confirmed to be good. Also, experiments on applying 0.005 ~ 40 kg (0.05 ~ 390 N) to each axis were implemented and the sensor is proved to be safe under a high load. Finally, to verify the function calculating the direction of load vector, the directions of various load vectors which have the same magnitude but different directions and the directions of the calculated load vectors are compared and analyzed to accord well.

Seismic Reinforcement of Rural Low-rise Building using Carbon Fiver Plate (탄소판가새를 이용한 농촌 저층건물의 내진보강)

  • Jung, Dong-Jo;Choi, Sung-Dae
    • Journal of the Korean Institute of Rural Architecture
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    • v.16 no.2
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    • pp.1-8
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    • 2014
  • In the past, Korea was classified as a region not affected by earthquakes. However, recent increase of earthquakes has forced to strengthen standards of earthquake resistant designs of structures to minimize seismic damage. In addition, it was thought that masonry infill walls in buildings are only acting as partitions, so these walls are not considered in analyzing building structures. But it was found that when seismic loads are applied to a structure with masonry infill walls, the walls affect the structure. Accordingly, this study conducted nonlinear static analyses for a structure constructed before applying earthquake resistant designs in two cases: when considering masonry walls and when not. The result showed that the seismic performance of the structure is insufficient. Thus, the structural resistance of the structure was also studied in two cases: when reinforcing with steel plate braces and when using carbon fiber braces. In the two cases reinforcing two different stiffeners, it was appeared that the behaviors of the structure were similar, though the cross-section area of a carbon fiber brace used to reinforcing the structure is only 12.6% of a steel plate brace, and its weight is only 2.8%. Thus, the reinforcing effect of the thin, light-weighted carbon fiber brace is much larger than that of the steel plate brace, when considering usability and constructability of both materials.

A Comparative Study in the Fatigue Behavior Characteristics of R/C Beams Strengthened with Steel Plate or Carbon Fiber Strengthened with Steel Plate or Carbon Fiber Sheet (강판 및 CFS로 보강된 R/C보의 피로거동 특성 비교 연구)

  • 심종성;황의승;배인환;장상훈
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.527-533
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    • 1997
  • The purpose of this study is to investigate the fatigue behavior of the reinforced concrete beams strengthened with steel plate and CFS(csrbon fiber sheet). In this study, fatigue loads of 60 to 80 percent of the ultimate strength are applied to the specimens. From the results of test the beams strengthened with steel plate show the flexural failure mode, while the specimens strengthened with CFS fail by separation between CFS and concrete surface. In case of the stress level of 70%, strength degradations of the beams with steel plate and CFS in normalized flexural rigidity at 5,000 cycles is 24 and is 24 and 28 percent respectively.

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