• Title, Summary, Keyword: 탄소섬유강화플라스틱

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섬유함유율에 따른 GF/PP 복합재료의 인장강도

  • 엄윤성;고성위
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.39-42
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    • 2003
  • 최근에 널리 쓰이고 있는 섬유강화 복합재료는 플라스틱 재료가 갖고 있는 가공성의 장점을 충분히 발휘한 재료로서 모재인 수지와 강화재인 강화섬유로 구성되며 사용된 섬유의 종류에 따라 유리섬유강화플라스틱(GFRP : glass fiber reinforced plastic)과 탄소섬유강화플라스틱(CFRP : carbon fiber reinforced plastic)으로 구분된다. 이 두 복합재료가 건설, 선박, 자동차 그리고 우주항공분야에 이르기까지 거의 모든 산업에서 다양하게 이용되고 있다. (중략)

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Evaluation of Fatigue Crack Propagation Depending on Fiber Array Direction in Woven CFRP Composites (평직 CFRP 복합재료의 섬유 배열각도별 피로 균열 성장 평가)

  • Geum, Jin-Hwa;Choi, Jung-Hun;Park, Hong-Sun;Koo, Jae-Mean;Seok, Chang-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.6
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    • pp.717-723
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    • 2010
  • Many researchers have studied woven fabric carbon-fiber-reinforced composite (CFRP) materials but the study of fatigue crack propagation in composites has been insufficient. It has known that the crack propagation behavior differs depending on the load and the fiber direction. In this study, the fatigue crack propagation along two different fiber array directions ($0^{\circ}$, $45^{\circ}$) in plain woven CFRP composite was investigated. Fatigue crack propagation tests were conducted on the woven CFRP composite under a sinusoidal waveform load with stress ratios of 0.1 at a frequency of 10 Hz. Once the results of the tests were obtained, fatigue crack propagation rates (da/dN) were plotted against the energy release rate amplitude (${\Delta}G$), and it was observed that either mode I crack propagation or mixed mode crack propagation occurs depending on the fiber array direction.

Bending Performance of Glulam Beams Reinforced with Carbon Fiber-Reinforced Plastics Bonded with Polyvinyl Acetate-Based Adhesive (초산비닐수지계 접착제를 사용한 탄소섬유강화플라스틱 복합집성재의 휨 성능)

  • Park, Jun-Chul;Shin, Yoon-Jong;Hong, Soon-Il
    • Journal of the Korean Wood Science and Technology
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    • v.37 no.4
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    • pp.364-371
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    • 2009
  • This study was carried out to investigate the bending strength of the Larix glulam beams which were reinforced with CFRP (Carbon fiber reinforced plastic) of which the reinforcement ratios were 0.7% and 2.1% by volume. In the bending test, the rupture shape of the reinforced glulam shows that the reinforced glulam broke firstly in the lowest bottom layer on which tension was loaded, but did not in the upper part reinforced with the CFRP layer. The upper part of the reinforced layer kept strength and did not break when the reinforced glulam broke firstly at the bottom part of the reinforced layer, but broke secondly as loading was increased. In the glulam beams reinforced with CFRP of which the reinforcement ratio was 0.7% by volume, the bending strength of the reinforced beams was increased by 28% at the first break. When beams broke up to the upper part of the reinforced layer, the bending strength of the reinforced beams was increased by 55%, compared to those of control glulam beams. When the glulam beams were reinforced with CFRP of which the reinforcement ratio was 2.1% by volume, the bending strength of the reinforced beams was increased by 77%, compared to those of control glulam beams. The ratio of the height of calculated neutral axis using failure mode recommended by Romani and the height of actual neutral axis using strain gauge was 1.03 and agreed well.

Study on the Qualitative Defects Detection in Composites by Optical Infrared Thermography (적외선 열화상 기술을 이용한 복합재료의 결함 검출 정량화 연구)

  • Park, Hee-Sang;Choi, Man-Yong;Park, Jeong-Hak;Kim, Won-Tae;Choi, Won-Jong
    • Journal of the Korean Society for Nondestructive Testing
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    • v.31 no.2
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    • pp.150-156
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    • 2011
  • In this paper, infrared thermography measurement technique has been used to develop standard measurement technique for nondestructive testing of composite materials which is widely used in aerospace industries. To increase the defect detection rate, the related experiment used the lock-in IR-thermographiy method. Therefore it is of considerable interest in the field of non-destructive testing for fast discontinuity detection by using ultrasonic lock-in infrared thermography. The result also shows that as the investigation period of light source is lengthened according to the thickness of specimen, the possibility of detecting defects gets higher as well. However, the reason why the result values were not favorable when less than 50 mHz of light source was provided is because it was difficult to detect defects as the defect parts became a state of thermal equilibrium in general when thermal diffusivity affects the entire materials.

A Study on the Cutting Characteristics of the Carbon Fiber Reinforced Plastics by Drill Tools (드릴에 의한 탄소섬유강화플라스틱의 절삭특성에 관한 연구)

  • 박종남;정성택;김선진;조규재
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.279-282
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    • 2002
  • With the development of industrial society, the interest of new material is growing even in machining center. Composite materials in the new materials are superior to the metals In measure stability of strength, modulus and heat, moreover when mould is prepared, it can be done net shape manufacturing so it can be used widely in all sorts of machine parts, interior materials of car structural construct ions, the space aerial industry, ship materials, sports goods and so on. Therefore in this study, the property of processing drill on CFRP in composite materials by experimental study and some problems were examined.

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Improved Electrical Conductivity of CFRP by Conductive Nano-Particles Coating for lightning Strike Protection (낙뢰손상방지를 위한 전도성 나노입자 코팅에 의한 탄소섬유 복합재료의 전기전도도 향상 연구)

  • Ha, Min-Seok;Kwon, Oh-Yang;Choi, Heung-Soap
    • Composites Research
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    • v.23 no.1
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    • pp.31-36
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    • 2010
  • The improvement of electrical conductivity of carbon-fiber reinforced plastics (CFRP) has been investigated by silver nano-particles coating for the purpose of lightning strike protection. Silver nano-particles in colloid were sprayed on the surface of carbon fibers, which were then impregnated by epoxy resin to form a CFRP specimen. Electrical resistance was measured by contact resistance meter which utilize the principles of the AC 4-terminal method. Electrical resistance value was then converted to electrical conductivity. The coated silver nano-particles on the carbon fibers were verified by SEM and EDS. The electrical conductivity was increased by three times of the ordinary CFRP.

Service life prediction of CFRP bar for concrete reinforcement based on accelerated degradation tests (가속열화시험에 의한 콘크리트용 탄소섬유 강화플라스틱 바의 사용수명 예측)

  • Kwon, Young-Il;Kim, Seung-Jin;Lee, Hyoung-Wook
    • Journal of Applied Reliability
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    • v.9 no.2
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    • pp.71-80
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    • 2009
  • This paper discusses the service life prediction methods for CFRP bar for concrete reinforcement using accelerated degradation tests. The relationship between performance degradation and the rate of a failure-causing chemical reaction is assumed for the temperature accelerated degradation tests. Methods of obtaining acceleration factors and predicting service life of the CFRP bar using the degradation model are presented.

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