• Title/Summary/Keyword: 탄소섬유 에폭시 복합재료

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A Study on Precise Drilling Characteristics of Carbon Fiber Epoxy Composite Materials (탄소섬유 에폭시 복합재료의 정밀드릴가공 특성에 관한 연구)

  • 김홍배
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.10
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    • pp.203-208
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    • 1998
  • Carbon fiber epoxy composite materials are widely used in the structures of aircrafts, robots and other machines because of their high specific strength, high specific stiffness and high damping. In order for the composite materials to be used in the aircraft structures or machine elements, accurate surfaces for bearing mounting or joints must be provided, which require precise machining. In this paper, the machinability characterisitcs of the drilling operation of the carbon fiber epoxy composite materials was experimentally investigated. The experimental results are as follows 1.The entrance of hole is very good manufacturing existing, but exit come to occur sever surface exfoliation. 2. The cutting force in drilling of the carbon fiber epoxy composite materials is decreased as the drilling speed increased. 3.The hole of the carbon fiber epoxy composite materials is not good manufacturing by use of the standard twist, therefore, the new drill designed in order to accurate hole.

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A Study on the Drilling Characteristics of Carbon Fiber Epoxy Composite Materials by Diamond Grit Electroplated Drills (다이아몬드 입자 전착드릴에 의한 탄소섬유 에폭시 복합재료의 드릴링 특성에 관한 연구)

  • Kim, Hyeong-Chul;Kim, Ki-Soo;Hahm, Seung-Duck;Kim, Hong-Bea;Namgung, Suk
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.8
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    • pp.27-38
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    • 1995
  • For solving troubles happened during the drilling process with carbon fiber epoxy composite materials(CFRP) by using HSS drill, a few types of diamond gift electroplated drills are manufactured, and machinability of these drills is experimented with a variety of cutting speed and feed rate. These drills have some advantages of good wear resistant and the conception of grinding process. As a result, using of these drills improves both troubles being caused by tool wear and damage of exit surface depending on fiber stacking angle. It is desirable that cutting conditions for the cutting thickness per revolution must be set under 0.01mm when the size of a diamond grit is # 60 .approx. 80.

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A study on effects of the fiber orientation and point angle on drilling characteristics of carbon fiber epoxy composite materials (탄소섬유 에폭시 복합재료의 드릴링 특성에 있어 섬유 배열방향과 선단각의 영향에 관한 연구)

  • Kim, Hyeong C.;Lee, Woo Y.;Namgung, Suk.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.4
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    • pp.119-125
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    • 1997
  • The drilling experiment of carbon fiber epoxy composite material with WC-drill has been done under the various cutting conditions in order to minimize the problems occurred in the material while being drilled. It has been confirmed by a frequency analysis of the cutting force signals that the variation of cutting force resulted from the periodic variation of the angle between the ortating drill and the stacking angle of the carbon fiber. By the drilling experiment with several drills having different point angles, the drilling char- acteristics, which show the relations between the change in the point angle and cutting force or external surface condition, were analyzed.

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DGEBA-MDA-SN-Hydroxyl Group System and Composites : 2. Fracture Energy of Fiber Reinforced Composites (DGEBA-MDA-SN-Hydroxyl Group System의 합성 및 복합재료 제조 : 2. 섬유강화 복합재료의 파괴에너지)

  • Lee, Jae-Young;Shim, Mi-Ja;Kim, Sang-Wook
    • Applied Chemistry for Engineering
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    • v.5 no.4
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    • pp.737-742
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    • 1994
  • The fracture energy of glass fiber/carbon fiber/epoxy resin hybrid composite system was investigated in the aspect of fracture mechanism. Epoxy resin matrix was DGEBA-MDA-SN-HQ system. On the interface of glass fiber and matrix, post debone friction energy provided a major contribution to the fracture energy, and debonding energy and pull-out energy were of the similar value. In the case of fracture on the interface of carbon fiber and matrix, pull-out energy was the major contributor.

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Improvement of Mechanical and Interfacial Properties of Carbon Fiber/Epoxy Composites by Adding Nano SiC Fillers (나노 SiC 입자의 형상에 따른 탄소섬유 강화 에폭시 복합재료의 기계적 및 계면 물성 변화 관찰)

  • Kwon, Dong-Jun;Wang, Zuo-Jia;Kim, Je-Jun;Jang, Key-Wook;Park, Joung-Man
    • Journal of Adhesion and Interface
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    • v.14 no.2
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    • pp.75-81
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    • 2013
  • Epoxy matrix based composites were fabricated by adding SiC nano fillers. The interfacial properties of composites were varied with different shapes of SiC nano fillers. To investigate the shape effects on the interfacial properties, beta and whisker type SiC nano fillers were used for this evaluation. The dispersion states of nano SiC-epoxy nanocomposites were evaluated by capacitance measurements. FE-SEM was used to observe the fracture surface of different structures of SiC-epoxy nanocomposites and to investigate for reinforcement effect. Interfacial properties between carbon fiber and SiC-epoxy nanocomposites were also evaluated by ILSS (interlaminar shear strength) and IFSS (interfacial shear strength) tests. The interfacial adhesion of beta type nanocomposites was better than whisker type.

Single Carbon Fiber/Acid-Treated CNT-Epoxy Composites by Electro-Micromechanical Technique and Wettability Test for Dispersion and Self-Sensing (젖음성 시험과 전기-미세역학 시험법과 통한 단 카본섬유/산처리된 CNT-에폭시 나노복합재료의 분산과 자체-감지능)

  • Jang, Jung-Hoon;Wang, Zuo-Jia;GnidaKouong, Joel;Gu, Ga-Young;Park, Joung-Man;Lee, Woo-Il;Park, Jong-Kyoo
    • Journal of Adhesion and Interface
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    • v.10 no.2
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    • pp.90-97
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    • 2009
  • Dispersion and self-sensing evaluation for single-carbon fiber reinforced in three different acid-treated CNT-epoxy nanocomposites were investigated by electro-micromechanical techniques and wettability tests. Self-sensing based on contact resistivity exhibited more noise for single carbon fiber/acid-treated CNT-epoxy composites than it did for untreated CNT. However, the apparent modulus was higher the acid treated case than the untreated case which is attributed to better stress transfer. The interfacial shear strength (IFSS) between carbon fibers and the CNT-epoxy was lower than that between carbon fiber and neat epoxy due to the increased viscosity associated with the addition of the CNT. The CNT-epoxy nanocomposite exhibited more hydrophobicity than did neat epoxy. Change in the thermodynamic work of adhesion was consistent with changes in the IFSS but disproportional to that of the apparent modulus. The optimum condition of acid treatment on the need can be obtained instead of the maximum condition.

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Safety Evaluation of Carbon Fiber/Epoxy Composite Link Using Micromechanics of Failure Criterion (미시역학적 파손 기준을 이용한 탄소섬유/에폭시 복합재 링크의 안전성 평가)

  • Jae Ho Cha;Sung Ho Yoon
    • Composites Research
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    • v.36 no.3
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    • pp.154-161
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    • 2023
  • This study explored the feasibility of replacing a metal link with a carbon fiber/epoxy composite link and assessed its capacity to withstand a given load condition using failure criteria. The micromechanics of failure (MMF) criterion was employed to predict the failure mode of the composite material, and mechanical tests were conducted to obtain reference strength parameters for MMF. The findings revealed that the stress distribution was concentrated near the hole, and weaknesses were found around the hole and at the end of the link under bending conditions. Based on the failure index, matrix tensile failure was predicted at the end of the link, and fiber compression failure occurred near the hole. The methods and results obtained from this study can provide valuable guidelines for assessing the safety of composite materials under specific load conditions when replacing metal parts with carbon fiber/epoxy composites to achieve weight reduction.

Measurement Method for Constituent Contents of Carbon Fiber/Epoxy Composites Using Thermogravimetric Analyzer (열중량분석기를 적용한 탄소섬유/에폭시 복합재의 구성재 함유율 측정 기법)

  • Jang, Jeong Keun;Cha, Jae Ho;Lee, Bo Mi;Yoon, Sung Ho
    • Composites Research
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    • v.33 no.6
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    • pp.341-345
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    • 2020
  • We propose a measurement method for evaluating constituent contents of carbon fiber/epoxy composites through a thermogravimetric analyzer (TGA). The sample used in the test was taken from a strand specimen made of carbon fiber/epoxy tow prepreg, and the change in weight of the sample over time was measured in real time. Using a field emission scanning electron microscope (FE-SEM), we examine the thermal damage condition of the carbon fiber depending on whether resin was removed or not. We find that it was possible to test even a small amount of sample when using TGA vis-à-vis using a conventional muffle furnace. In addition, TGA enables the temperature and exposure time to be controlled, allowing the constituent contents of composite materials to be efficiently and quantitatively evaluated.

Failure Behavior of Pin-jointed Carbon/Epoxy Composites under Hygrothermal Environmentals (열습환경을 고려한 탄소섬유/에폭시 복합재의 핀 체결부 파괴거동)

  • Kim, Chan-Gyu;Hwang, Young-Eun;Yoon, Sung-Ho
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.411-413
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    • 2012
  • This study has been investigated about hygrothermal environmental effects on the pin-joined carbon/epoxy composites through acoustic emission technique. The specimens were classified as three types for pin loading test : Base (before immersion), RT (room temperature immersion), HT ($75^{\circ}C$ immersion). As a results, the bearing strength of RT specimens was weakly decreased than that of base specimens. The bearing strength of HT specimens was greatly decreased than that of Base and RT specimens due to effects of simultaneous moisture and higher temperature. Also, the results from cumulative hit of acoustic emission indicated that AE events induced by matrix cracks of HT specimens was lower than that of base specimens.

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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.