• Title/Summary/Keyword: 탄소섬유 강화 복합제

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Effect of Various Sizing Agents on the Properties of Nylon6/Carbon Fiber Composites Prepared by Reactive Process (다양한 사이징제가 반응중합에 의해 제조된 나일론 6/탄소섬유 복합체의 물성에 미치는 영향)

  • Park, Ha-Neul;Lee, Hak Sung;Huh, Mongyoung
    • Composites Research
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    • v.31 no.6
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    • pp.299-303
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    • 2018
  • In order to improve the interfacial bonding force and reaction polymerization degree of the carbon fiber reinforced nylon 6 composite material, the surface of the existing epoxy-sizing carbon fiber was desized to remove the epoxy and treated with urethane, nylon and phenoxy sizing agent, was observed. The interfacial bond strength of the resized carbon fiber was confirmed by IFSS (Interfacial Shear Strength) and the fracture surface was observed by scanning electron microscope. The results showed that the interfacial bonding strength of the carbon fiber treated with nylon and phenoxy sizing agents was higher than that of urethane - based sizing. It has been found that the urethane - type resizing carbon fiber has lower interfacial bonding strength than the conventional epoxy - sizing carbon fiber. This result shows that the interfacial bonding between carbon fiber and nylon 6 is improved by removing low activity and smoothness of existing carbon fiber.

A Study on Characteristics of Impact Fracture in CFRP Laminate Plates (탄소섬유강화 복합재 적층판의 충격파괴 특성에 관한 연구)

  • Yang, I.Y.;Jung, J.A.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.5
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    • pp.38-46
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    • 1995
  • In this paper, an experimental study on the effects of the impact damage and the perforation characteristic of CFRP laminates with different fiber stacking orientation and ply number was done through an observation of interrelations between the impact energy vs. transmitted energy and the impact energy vs. absorbed energy per unit volume. The velocities of the ball before or after impact are measured by the high-speed camera. And when CFRP laminates are subjected to tranverse impact by a steel ball(${\phi}10$), the delamination shapes generated by impact damage are observed by using SAM (Scanning acoustic Microscope).

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Effects of Sizing Treatment of Carbon Fibers on Mechanical Interfacial Properties of Nylon 6 Matrix Composites (탄소섬유의 사이징처리가 탄소섬유/나일론6 복합재료의 기계적 계면 특성에 미치는 영향)

  • Park, Soo-Jin;Choi, Woong-Ki;Kim, Byung-Joo;Min, Byung-Gak;Bae, Kyong-Min
    • Elastomers and Composites
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    • v.45 no.1
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    • pp.2-6
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    • 2010
  • The sizing treatments of PAN-based carbon fiber surfaces were carried out in order to improve the interfacial adhesion in the carbon fibers/nylon6 composite system. The parameter to characterize the wetting performance and surface free energy of the sized fibers were determined by a contact angle method. The mechanical interfacial properties of the composites were investigated using critical stress intensity factor ($K_{IC}$). The cross-section morphologies of sized CFs/nylon6composites were observed by SEM. As the experimental results, it was observed that silane-based sizing treated carbon fibers showed higher surface free energies than other sizing treatments. In particular, the KIC of the sizing-treated carbon fibers reinforced composites showed higher values than those of untreated carbon fibers-reinforced composites. This result indicated that the increase in the surface free energy of the fibers leads to the improvement of the mechanical interfacial properties of carbon fibers/nylon6 composites.

Fabrication and Mechanical Properties of Carbon Fiber Reinforced Polymer Composites with Functionalized Graphene Nanoplatelets (기능기화 된 그래핀 나노플레이틀릿이 첨가 된 탄소섬유 강화 고분자 복합소재의 제조 및 기계적 특성 연구)

  • Cha, Jaemin;Kim, Jun Hui;Ryu, Ho Jin;Hong, Soon H.
    • Composites Research
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    • v.30 no.5
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    • pp.316-322
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    • 2017
  • Carbon fiber is a material with excellent mechanical, electrical and thermal properties, which is widely used as a composite material made of a polymer matrix. However, this composite material has a weak point of interlaminar delamination due to weak interfacial bond with polymer matrix compared with high strength and elasticity of carbon fiber. In order to solve this problem, it is essential to use reinforcements. Due to excellent mechanical properties, graphene have been expected to have large improvement in physical properties as a reinforcing material. However, the aggregation of graphene and the weak interfacial bonding have resulted in failure to properly implement reinforcement effect. In order to solve this problems, dispersibility will be improved. In this study, functionalization of graphene nanoplatelet was proceeded with melamine and mixed with epoxy polymer matrix. The carbon fiber reinforced polymer composites were fabricated using the prepared graphene nanoplatelet/epoxy and flexural properties and interlaminar shear strength were measured. As a result, it was confirmed that the dispersibility of graphene nanoplatelet was improved and the mechanical properties of the composite material were increased.

Chemorheological Behavior of Cyanate Ester Resin and Properties of Carbon Fiber Reinforced Polymer Composites (시아네이트 에스터 수지의 화학유변학적 거동 및 탄소섬유강화 고분자 복합재료의 물성)

  • Na, Hyo Yeol;Yoon, Byung Chul;Kim, Seung Hwan;Lee, Seong Jae
    • Elastomers and Composites
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    • v.48 no.2
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    • pp.133-140
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    • 2013
  • Carbon fiber reinforced polymer (CFRP) composites consist of carbon fibers in a polymer matrix. Recently, CFRP composites having high thermal stability and low outgassing are finding their use in high performance materials for aerospace and electronics applications under high temperature and high vacuum conditions. Cyanate ester resin is one of the most suitable matrix resins for this purpose. In this study, proper combination of cyanate ester and catalyst, curing behavior, and cure cycle were determined by chemorheology. Optimum condition was found to be catalyst content of 100 ppm and curing temperature of $150^{\circ}C$. Thermal stability and outgassing of cured resin composition were analyzed and the results showed thermal decomposition temperature of $385^{\circ}C$ and total mass loss of 0.29%. The CFRP prepregs and subsequent composites were fabricated by predetermined resin composition and the cure condition. Tensile moduli of the composites were compared with theoretical models and the results were very consistent.

Physical and Mechanical Properties of The Lignin-based Carbon Nanofiber-reinforced Epoxy Composite (에폭시 강화 리그닌 기반 나노탄소섬유 복합재료의 특성)

  • Youe, Won-Jae;Lee, Soo-Min;Lee, Sung-Suk;Kim, Yong Sik
    • Journal of the Korean Wood Science and Technology
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    • v.44 no.3
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    • pp.406-414
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    • 2016
  • The lignin-based carbon nanofiber reinforced epoxy composite has been prepared by immersing carbon nanofiber mat in epoxy resin solution in order to evaluate the physical and mechanical properties. The thermal and mechanical properties of the carbon nanofiber reinforced epoxy composite were analyzed using thermogravimetric analysis (TGA), differential scanning calorimeter (DSC) and tensile tester. It was found that the thermal properties of the carbon nanofiber reinforced epoxy composite improved, with its glass-transition temperature ($T_g$) increased from $90.7^{\circ}C$ ($T_g$ of epoxy resin itself) to $106.9^{\circ}C$. The tensile strengths of carbon nanofiber mats made from both lignin-g-PAN copolymer and PAN were 7.2 MPa and 9.4 MPa, respectively. The resulting tensile strength of lignin-based carbon nanofiber reinforced epoxy composite became 43.0 MPa, the six times higher than that of lignin-based carbon nanofiber mats. The carbon nanofibers were pulled out after the tensile test of the carbon nanofiber reinforced epoxy composite due to high tensile strength (478.8 MPa) of an individual carbon nanofiber itself as well as low interfacial adhesion between fibers and matrices, confirmed by the SEM analysis.

Performance Evaluation for Repair of Composite Maintenance Robot Using Carbon Fiber Spray Method (탄소섬유 분사형 복합재 유지보수 로봇의 보수성능평가)

  • Geun-Su Song;Dae-Ham Cheon;Jae-Youl Lee;Kwang-Bok Shin
    • Composites Research
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    • v.37 no.2
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    • pp.76-85
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    • 2024
  • In this paper, a composite maintenance robot using carbon fiber spray method was developed that automatically sprays mixture was created for repair to damaged areas to repair them. To develop a robot, a repair process was developed in which a mixture of milled carbon fiber, epoxy resin, and hardener is sprayed and consolidated on the damaged area. To automate the repair process, an EOAT based on a collaborative robot was developed that can automatically suction and spray the mixture onto the damaged area. To evaluate the repair performance of the robot, 0° and 90° unidirectional specimens were manufactured and tested in accordance with ASTM D3039. Tests were performed on undamaged specimen, damaged specimen, and repaired specimen by a robot after damaged. As a result of the specimen test, the tensile strength of the 0° and 90° specimens was recovered by 10% and 90% after repair. Based on the test results, the repair performance of the developed composite maintenance robot was verified.

Study on the Improvement of Epoxy Property for Aluminum Conductor Composite Core (복합재료 중심인장선용 에폭시 물성 개선 연구)

  • Heo, Seok-Bong;Kang, Junyoung;Youn, Young-Gil;Goh, Munju;Kim, Nam Hoon
    • Composites Research
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    • v.32 no.6
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    • pp.349-354
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    • 2019
  • The Aluminum conductor composite core consists of fast-curing thermosetting epoxy used as reinforcements and carbon fiber and glass fiber used as matrix. In this study, we have investigated fast curing epoxy cured products used for composite core(Aluminum Conductor Composite Core, ACCC). Tetrafunctional epoxy(PA 806) was used as a multifunctional epoxy, along with two kinds of curing agents, MNAn(5-Methyl-5-norbornene-2,3-dicarboxylic anhydride) and HHPA(Hexahydrophthalic Anhydride), to make an epoxy cured product and their properties were evaluated. Optimum conditions are confirmed by varying the content of curing accelerator in the selected epoxy and curing agent.

Test Evaluation of a Linerless Composite Propellant Tank Using the Composite Collapsible Mandrel (복합재 분리형 맨드릴을 이용한 라이너 없는 복합재 추진제 탱크에 대한 시험 평가)

  • Seung Yun Rhee;Kwangsoo Kim;Young-Ha Yoon;Moo-Keun Yi;Hee Chul Kim
    • Composites Research
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    • v.36 no.2
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    • pp.132-139
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    • 2023
  • A linerless composite propellant tank was designed and manufactured by using the carbon fiber-reinforced composite materials which have superior strength-to-weight ratio in order to reduce weight of the tank. In this research, we designed a sub-scale composite propellant tank with a diameter of 800 mm to withstand an MEOP of 1.7 MPa. We manufactured the boss of the tank by using the same composite materials to reduce the thermal expansion difference between the boss and the secondary-bonded composite layers of the barrel in the cryogenic environment. We used the collapsible mandrel to manufacture the tank without any liner. The mandrel was made from epoxy-based composite tooling prepregs to reduce weight of the mandrel. We manufactured the test tanks by laying up the carbon fiber fabric prepregs manually on the mandrel and then applying the autoclave cure process. We performed a proof test, a helium tightness test, a repeated pressurization test, and a burst test in room temperature. The test results demonstrate that the proposed design and manufacture process satisfies all strength requirements as well as an anti-leakage requirement.

Study on the Durability of Composite Tilting Pad Journal Bearing for Turbo Compressor System under Oil-cut Situation (터보 컴프레셔용 복합재료 틸팅 패드 저널 베어링의 오일 공급 중단 상황에서의 내구성 연구)

  • Choe, Kang-Yeong;Jung, Min-Hye;You, Jun-Il;Song, Seung-A;Kim, Seong-Su
    • Composites Research
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    • v.29 no.3
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    • pp.111-116
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    • 2016
  • The tilting pad journal bearing for the turbo compressor application has a role to support high speed and heavy loading rotor. White metal has been widely used for the bearing material but the conventional bearing is immediately suspended and induces serious serious damage to the rotor under the unexpected oil cut situation or the insufficient oil film formation. The carbon fiber reinforced composite having high specific stiffness, specific strength and excellent tribological characteristics can solve these seizure problems. In this work, the study on the durability of high thermal resistance carbon fiber/epoxy composite tilting pad journal bearing under oil cut situation was conducted. The material properties of the composite materials including tensile, compressive and interlaminar properties were measured at room and high temperature of oil cut situation. To investigate the possibility of failure of composite tilting pad journal bearing under oil cut situation, the stress distribution of the composite bearing was analyzed via finite element analysis and the Tsai-Wu Failure index was calculated. To verify the failure analysis results, the oil cut tests for the composite tilting pad journal bearing were conducted using industrial test bench.