• 제목/요약/키워드: carbon-PEEK composite

검색결과 17건 처리시간 0.031초

Tribological Properties of Carbon/PEEK Composites

  • Yoon, Sung-Won;Kim, Yun-Hae;Lee, Jin-Woo;Kim, Han-Bin;Murakami, Ri-Ichi
    • International Journal of Ocean System Engineering
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    • 제3권3호
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    • pp.142-146
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    • 2013
  • In this study, the effect of Carbon/PEEK composites on the tribological properties has been investigated. Also, its validity has been tested in the capacity of alternative materials of the Ti-based materials used for artificial hip joint. Moreover, this work evaluated the mechanical properties according to the fiber ply orientation, along with the fractured surfaces of the carbon/PEEK composites. The composites with a unidirectional orientation had higher tribological properties than those with a multidirectional orientation. This was caused by the debonding between the carbon fiber and the PEEK, which was proportional to the contact area between the sliding surface and the carbon fiber. The friction test results showed that there were no significant differences in relation to the fiber ply orientation. However, the friction properties of the carbon/PEEK composites were higher than those of the carbon/epoxy composites. In addition, the results showed that a composite that slid in a direction normal to the prepreg lay-up direction had a smaller friction coefficient than one that slid in a direction parallel to the prepreg lay-up direction.

탄소섬유강화 복합재료의 피로강도에 미치는 모재의 영향 (Effect of matrix on fatigue strength of carbon fiber composite materials)

  • 유승원
    • 한국해양공학회지
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    • 제6권1호
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    • pp.113-121
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    • 1992
  • In this study, the variation of fatigue strength in CF/PEEK and CF/EPOXY, the matrix and interfacial strength of which differ from each other, has been studied from the viewpoint of microfracture behavior. The results obtained are as follows; According as the fatigue strength moves from the lower cycle range to the higher cycle range, that of CF/PEEK shows higher curve than that of CF/EPOXY does. In the early stage of fatigue life, the characteristic of fatigue crack in CF/PEEK is mainly the fracture of longitudinal fiber, while that in CF/EPOXY is the fracture of transverse fiber. The difference of fatigue strength in these materials can be explained by the fracture criteria of transverse fiber and longitudinal fiber.

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고온하에서 횡충격을 받는 CF/PEEK 적층재의 충격손상과 잔류강도 (The Impact Damage and the Residual Strength of CF/PEEK Laminate Subjected to Transverse Impact under the High Temperature)

  • 양인영;정종안
    • 한국자동차공학회논문집
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    • 제2권6호
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    • pp.66-75
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    • 1994
  • In this paper, the effects of temperature change on the impact damages of CF/PEEK laminates are experimentally investigated. Composite laminates used in this experiment are CF/PEEK orthotropic laminated plates, which have two-interfaces$[0^{\circ}_4/90^{\circ}_4]_{9+} A steel ball launched by the air gun collides against CFRP laminates to generate impact damage. The delamination damages are oberved by a scanning acoustic microscope. And various relations are experimentally observed including the impact energy vs. delamination area, the specimen temperature vs. transverse crack, and the impact energy vs. residual bending strength of carbon fiber peek composite laminates subjected to FOD(Foreign Object Damage) under high temperatures.

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유도가열 기술을 이용한 탄소섬유-열가소성 복합재의 접합 공정에 관한 연구 (A Study on the Bonding Process of Carbon Fiber-Thermoplastic Composite Using Induction Heating Technology)

  • 강창수;유명한;서민강;최보경
    • Composites Research
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    • 제34권6호
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    • pp.421-425
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    • 2021
  • 본 연구에서는 동일한 열가소성 수지(PEEK)와 각기 다른 탄소섬유(Type A, Type B) UD 테이프를 이용하여 열가소성 복합재를 제작하고 제작된 각각 2개의 복합재를 유도가열 용접방식에 따라 접합 특성 및 기계적 특성에 대하여 고찰하였다. 복합재의 접합 특성과 기계적 특성은 비파괴검사인 C-Scan, B-Scan과 전단 강도(Single lap shear)를 각각 측정하였고, 열화상 카메라를 이용하여 시편 표면의 온도를 모니터링 하였다.

Sulfonated Poly(Ether Ether Ketone)을 코팅한 이온선택성 복합탄소전극의 제조 및 전기화학적 특성 분석 (Fabrication and Electrochemical Characterization of Ion-selective Composite Carbon Electrode Coated with Sulfonated Poly(Ether Ether Ketone))

  • 최재환;박찬미
    • 공업화학
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    • 제24권3호
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    • pp.247-252
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    • 2013
  • 반응시간을 변화시키면서 poly(ether ether ketone) (PEEK)을 황산과 반응시켜 술폰화도가 다른 sulfonated PEEK (SPEEK)를 합성하였다. 제조한 SPEEK를 탄소전극 표면에 코팅하여 이온선택성 복합탄소전극(ion-selective composite carbon electrode, ISCCE)을 제조하였다. 임피던스 분석을 통해 제조한 ISCCE의 비정전용량과 전기저항을 측정하였다. 술폰화 반응 시간에 따라 SPEEK의 이온교환용량은 1.60~2.57 meq/g으로 측정되었다. 그러나 이온교환용량이 2.5 meq/g 이상에서는 SPEEK가 일부 물에 용해되어 ISCCE 제조에 부적합하였다. ISCCE에 대한 정전용량을 측정한 결과 코팅된 SPEEK의 이온교환용량이 증가함에 따라 정전용량도 증가하였으며 코팅하지 않은 탄소전극에 비해 최대 20%까지 향상되었다. 또한 코팅층의 전기저항은 SPEEK의 이온교환용량이 증가함에 따라 크게 감소하였다. 따라서 SPEEK가 코팅된 ISCCE를 이용하여 기존 축전식 탈염(capacitive deionization, CDI) 공정의 탈염효율을 크게 향상시킬 수 있을 것으로 기대된다.

선진복합재료 적층판의 동적 층간 파괴 인성평가 (A study on the fracture toughness of dynamic interlaminar for CFRP composite laminates)

  • 김지훈;김영남;양인영;심재기
    • 한국안전학회지
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    • 제13권4호
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    • pp.41-48
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    • 1998
  • In this paper, an investigation was performed on the dynamic interlaminar fracture toughness of CFRP(carbon fiber reinforcement plastics) composite laminates. Composite laminates used in this experimentation are CF/EPOXY and CF/PEEK laminated plates. In the experiments, Split Hopkinson's Bar(SHPE) test was applied to dynamic and notched flexure test. The mode Ⅱ fracture toughness of each unidirectional CFRP was estimated by the analyzed deflection of the specimen and J-integral with the measured impulsive load and reactions at the supported points. As an experimental result, the vibration amplitude of CF/PEEK laminates appear more than that of CF/EPOXY laminates for the J-integral and displacement velocity at a measuring point. Also, it is thought that the dynamic fracture toughness of two kind specimens(CFRP/EPOXY and CF/PEEK) with the in crease of displacement velocity becomes a little greater at a measuring point within the range of measurement.

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Comparison of Mechanical Properties between Carbon/PEEK Composites and Ti Stem for Optimal Design

  • Yoon, Sung-Won;Kim, Yun-Hae;Jung, Min-Kyo;Murakami, Ri-Ichi
    • International Journal of Ocean System Engineering
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    • 제3권3호
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    • pp.152-157
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    • 2013
  • This study, a new concept design of the stem and aims to determine the suitability of various carbon/PEEK composite designs for artificial hip joints. Shear stress tested with alternative materials of the Ti-based stem for artificial hip joints. In addition, FEA is conducted according to the fiber ply orientation and the load condition for carbon/PEEK composites. The stem shape of two types was designed through the shape normal of the femur. Multidirectional load cases were used for each FEA model. In the case of general shape, the results show that the stress of ply orientation case II was lower than for cases I and III. On the other hand, in the case of the curved shape, ply orientation case I was lowest. In the case of the Ti stem, the stress of the curved shape was 18% lower than the general shape.

Compression Strength Size Effect on Carbon-PEEK Fiber Composite Failing by Kink Band Propagation

  • Kim, Jang-Ho
    • KCI Concrete Journal
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    • 제12권1호
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    • pp.57-68
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    • 2000
  • The effect of structure size on the nominal strength of unidirectional fiber-polymer composites, failing by propagation of a kink band with fiber microbuckling, is analyzed experimentally and theoretically. Tests of novel geometrically similar carbon-PEEK specimens, with notches slanted so as to lead to a pure kink band (without shear or splitting cracks), are conducted. The specimens are rectangular strips of widths 15.875, 31.75. and 63.5 mm (0.625, 1.25 and 2.5 in and gage lengths 39.7, 79.375 and 158.75 mm (1.563, 3.125 and 6.25 in.). They reveal the existence of a strong (deterministic. non-statistical) size effect. The doubly logarithmic plot of the nominal strength (load divided by size and thickness) versus the characteristic size agrees with the approximate size effect law proposed for quasibrittle failures in 1983 by Bazant This law represents a gradual transition from a horizontal asymptote, representing the case of no size effect (characteristic of plasticity or strength criteria), to an asymptote of slope -1/2 (characteristic of linear elastic fracture mechanics. LEFM) . The size effect law for notched specimens permits easy identification of the fracture energy of the kink bandand the length of the fracture process zone at the front of the band solely from the measurements of maximum loads. Optimum fits of the test results by the size effect law are obtained, and the size effect law parameters are then used to identify the material fracture characteristics, Particularly the fracture energy and the effective length of the fracture process zone. The results suggest that composite size effect must be considered in strengthening existing concrete structural members such as bridge columns and beams using a composite retrofitting technique.

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3차원 직조형 열가소성수지 복합재료 제조 및 특성화 (Fabrication and Characterization of 3D Woven Textile Reinforced Thermoplastic Composites)

  • 홍순곤;변준형;이상관
    • Composites Research
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    • 제16권2호
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    • pp.33-40
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    • 2003
  • 본 논문은 열경화성수지 적층 복합재료의 낮은 충격 특성과 층간 분리 현상을 개선하고자 열가소성 수지 및 3차원 직조 프리폼을 사용한 복합재료 제조와 물성 특성화에 대한 것이다. 새로운 기술인 co-braiding 성형법으로 열가소성 PEEK 섬유와 탄소섬유를 혼합한 섬유를 제조하였으며. 층간 분리 억제 특성을 현저하게 향상시키기 위하여 두께방향의 섬유를 가지는 3차원 직조형 프리폼을 제조하였다. 혼합섬유로 제조된 프리폼에 열성형 공정을 적용함으로써 열가소성 복합재료를 제조하였으며. 혼합섬유의 PEEK 섬유는 용융온도에서 용융되어 탄소섬유 사이로 함침이 완벽하게 일어남을 확인하였다. 또한, APC-2/AS4 프리프레그를 사용한 준 등방 적층 복합재료를 제조하여 3차원 직조형 열가소성 복합재료의 특성과 비교하였다. 항공기 소재로서의 적용 가능성을 알아보기 위하여 open hole 인장시험, 충격시험, 및 충격 후 압축시험 등의 결과를 통하여 3차원 직조형 열가소성 복합재료는 기존의 적층 복합재료보다 우수한 내 충격성 손상허용치를 가짐을 보였다.

티타늄과 탄소 섬유 강화 PEEK로 구성된 요추 유합술용 연결봉의 의공학적 영향에 대한 비교 분석 (Comparative Analysis of Biomechanical Behaviors on Lumbar with Titanium and Carbon Fiber Reinforced PEEK Connecting Rods for Fusion Surgery)

  • 서혜성;강해성;전흥재
    • Composites Research
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    • 제34권3호
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    • pp.186-191
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    • 2021
  • 요추에 퇴행이 발생하였을 때 이를 치료하기 위해 요추 유합술이 시행된다. 유합술은 척추체 사이의 추간판을 제거하고 뼈 그래프트 등을 삽입하여 굳혀 하나 이상의 분절을 완전히 고정시켜 척추의 안정성을 복원한다. 둘 이상의 척추체가 단단히 유합될 수 있게끔 척추체를 고정하는 수단으로 척추경 나사못과 연결봉이 환자의 체내에 삽입된다. 본 연구에서는 중증 요추 퇴행성 질환의 치료에 쓰이는 척추 유합술에서 사용하는 척추경 나사못 구조물이 적용된 총 7개의 환자 맞춤형 요추 유한 요소 모델을 생성하였다. 생성한 모델에 각각 티타늄과 CFR-PEEK로 구성된 연결봉을 구성하였다. 척추의 4가지 대표적 거동에 대해 유한요소해석과 통계적 분석을 진행하여 연결봉의 재질이 척추 상태에 미치는 의공학적 영향을 조사하였다. 인접 분절의 추간판 내 압력과 각 분절의 관절 구동 범위가 의공학적 영향을 확인하기 위한 지표로 사용되었다. 연결봉에 CFR-PEEK를 사용한 경우 Ti 연결봉에 비해 인접 분절의 추간판 내 압력은 감소하였고 각 분절의 관절 구동 범위는 증가하였다. 그러나 모든 하중조건에서 통계학적으로 유의미한 경향성 차이는 관찰되지 않았다.