• 제목/요약/키워드: CFRP laminated

검색결과 108건 처리시간 0.022초

필라멘트 와인딩 복합적층재의 환경가속 노화시험 평가 (Degradation Characteristics of Filament-Winding-Laminated Composites Under Accelerated Environmental Test)

  • 김덕재;윤영주;최낙삼
    • 대한기계학회논문집A
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    • 제31권3호
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    • pp.295-303
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    • 2007
  • Degradation behaviors of filament-winded composites have been evaluated under the accelerated environmental test of high temperature, water immersion and thermal impact conditions. Two kinds of laminated composites coated by an urethane resin have been used: carbon-fiber reinforced epoxy(T700/Epon-826, CFRP) and glass-fiber reinforced phenolic (E-glass/phenolic, GFRP). For tensile strength of $0^{\circ}$ composites, CFRP showed little degradation while GFRP did high reduction by 25% under the influence of high temperature and water However for water-immersed $90^{\circ}$ composites tensile strength of both CFRP and GFRP showed high reduction. Bending strength and modulus of $90^{\circ}$ composites were largely reduced in water-immersion as well as high temperature environment. Urethane coating on the composite surface improved the bending properties by 20%, however hardly showed such improvement for water-immersed $90^{\circ}$ composites. In case of shear strength and modulus, both CFRP and GFRP showed high reduction by water-Immersion test but did a slight increase by high temperature and thermal impact conditions.

자전거 프레임용 CFRP 파이프 설계제작 (Design and Manufacture of CFRP Pipe for Bicycle Frame)

  • 이범성
    • 한국정밀공학회지
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    • 제20권6호
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    • pp.130-137
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    • 2003
  • The pipe of CFRP for bicycle frame is designed and made for light weight of bicycle and then its suitability to bicycle frame is verified by comparing the other material i.e. steel, Cr-Mo steel, Al alloy pipe for bicycle frame. The pipe of CFRP is laminated to [0/$\pm$45]$_T$ and made by tape winding method and then its degree of light weight is evaluated by comparing the other pipes which is made by steel etc.

CFRP적층재의 잔류피로굽힘강도애 미치는 열습의 영향 (Influence of Hygrothermals on Residual Fatigue Bending Strength of CFRP Composite Laminates)

  • 박노식;임광희;양인영
    • 한국안전학회지
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    • 제12권2호
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    • pp.27-36
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    • 1997
  • This paper evaluates the static and fatigue bending strengths of CFRP (carbon fiber reinforced plastic) laminates subjected to hygrothermals. The specimens which had different stacking composition, orthotropic and quasi-isotropic laminated plates, were prepared for this experiment. A steel ball launched by the air gun collides against CFRP laminates to generate impact damages, and the 3-point fatigue bending test is carried out by using the impacted laminates to investigate the influence of hygrothermals on the effect on the residual bending fatigue strength of CFRP laminates.

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이변량 Gaussian 분포함수를 적용한 CFRP 적층 평판의 보강섬유 물성저하 규명 (Determination of Degraded Fiber Properties of Laminated CFRP Flat Plates Using the Bivariate Gaussian Distribution Function)

  • 김규동;이상열
    • Composites Research
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    • 제29권5호
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    • pp.299-305
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    • 2016
  • 본 연구는 이변량 Gaussian 분포함수를 적용하여 CFRP 적층판의 섬유물성 변화를 추정하는 방법을 제안하였다. 섬유의 손상 분포를 규명하기 위하여 수정된 이변량 Gaussian 분포함수를 적용하여 5개의 미지 변수가 고려되었다. 조합된 컴퓨터 기법을 적용하여 역문제를 해결하기 위하여 본 연구에서는 몇 개의 고유진동수와 모드 정보를 입력데이터로 활용하였다. 수치해석 예제는 제안된 기법이 적층배열 변화에 따른 CFRP 판의 섬유 손상 분포 및 위치를 규명할 수 있는 적합하고 실용적은 방법임을 보여준다.

준정적 축 압축하중을 받는 Al/CFRP/GFRP 혼성부재의 에너지흡수 특성 (Energy Absorption Characteristics of the Al/CFRP/GFRP Hybrid Member under Quasi-static Axial Compressive Load)

  • 김선규;허욱;임광희;정종안
    • 한국생산제조학회지
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    • 제21권4호
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    • pp.588-592
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    • 2012
  • This study concentrates the effect of hybridisation on the collapse mode and energy absorption for composite cylinders. The static collapse behavior of laminated(Al/CFRP/GFRP) circular-cylindrical composite shell under quasi-static axial compressive load has been investigated experimentally. Eight different hybrids of laminated(Al/CFRP/GFRP) circular-cylindrical composite shell were fabricated by autoclave. Eight types of composites were tested, namely, Al/carbon fiber/epoxy, Al/glass fiber/epoxy, Al/carbon-carbon-glass/epoxy, Al/carbon-glass-carbon/epoxy, Al/carbon-glass-glass/epoxy, Al/glass-glass-carbon/epoxy, Al/glass-carbon-glass/epoxy and Al/glass-carbon-carbon/epoxy. Collpase modes were highly dominated by the effect of hybridisation. The results also showed that the hybrid member with material sequence of Al-glass-carbon-carbon/epoxy exhibited good energy absorption capability.

고온분위기하에서 탄소섬유강화 복합재적층판의 충격손상과 잔류굽힘강도 (A Study on the Impact Damage and Residual Bending Strength of CF/EPOXY Composite Laminate Plates Under High Temperature)

  • 양인영;박정수
    • 대한기계학회논문집
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    • 제18권8호
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    • pp.1930-1938
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    • 1994
  • In this paper, the effects of temperature change on the impact of CFRP laminates was experimentally studied. Composite laminates used for this experiment are CFRP orthotropic laminated plates, which have two-interfaces$[0_6^{\circ}/90_7^{\circ}]_s$ and four-interfaces$[0_3^{\circ}/90_6^{\circ}/0_3^{\circ}]_s$. The interrelations between the impact energy vs. delamination area, the impact energy vs. residual bending strength, and the interlayer delamination area vs. the decrease of the residual flexural strength of carbon fiber epoxy composite laminates subjected to FOD(Foreign Object Damage) under high temperatures were experimentally observed.

복합적층 하니콤 코어형 샌드위치 판무구조물의 진동특성을 고려한 최적설계 (Optimum Design of the Laminated Composite Sandwich Plate Structure of Honeycomb Core considering Vibration Characteristics)

  • 서진;홍도관;안찬우
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1997년도 추계학술대회 논문집
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    • pp.710-715
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    • 1997
  • This paper deals with the analysis of the optimum value of honeycomb core considering variable design parameter. As thickness and height of core rises in design parameter, natural frequency of laminated composite plate increases. The angle-phy has the maximum value when the plate of honeycomb core join to opposite direction. This paper shows that the natural frequency of CFRP was higher than that of GFRP and mode shapes were various at angle-ply.

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유한 요소법을 이용한 복합 적층 구조물의 진동 해석 연구 (A Study on the Vibration Analysis of Composite Laminated Structure Using F.E.M)

  • 허동현;김영권;신귀수;이기형;정인성
    • 한국자동차공학회논문집
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    • 제5권3호
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    • pp.220-228
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    • 1997
  • We discuss finite element approximation and use a Mindlin plate element based upon uniformly reduced numerical integration. The finite element selected for use in this work is a four-node, bilinear displacement element based upon the Mindlin theory of plates. Such elements show good accuracy for laminated composite plates when reduced numerical integration is used to evaluate the element marices. This study presents both the experimental and F.E. results for the natural frequencies of CFRPURETHANE-CFRP Composite plate. Good agreement between experimental and calculated frequencies is achived.

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저온하에서 CFRP 적층재의 충격 손상과 잔류 강도 -저/고온하에서 CFRP 적층재의 충격 손상을 중심으로 - (A Study on the Impact Damage and Residual Strength of CFRP Composite Laminates under Low Temperature)

  • 양인영;정종안;차천석
    • 비파괴검사학회지
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    • 제17권1호
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    • pp.1-10
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    • 1997
  • 본 연구에서는 첨단 재료인 CFRP 적층재가 저온 및 고온 분위기하에서 FOD를 받을 때 적층 부재의 충격 손상 즉, 온도 변화가 층간 박리 손상 및 모재 크랙 발생에 미치는 영향에 관해 관찰하였다. 연구 결과 주변온도가 CFRP 적층재의 충격 손상에 큰 영향을 미쳤으며 적층수가 많을수록 손상 박리 면적은 주변 온도의 변화에 따라 급격히 변화함을 알 수 있었다. 특히, CF/PEEK 적층재는 주변 온도가 낮아질수록 박리 면적은 급격히 증가하나 모재 크랙은 작아졌고 CF/epoxy 적층재는 온도가 낮아질수록 박리 면적, 모재 크랙 모두 커졌다. 즉, 시험편 표면 온도가 낮아지면 단위 충격 에너지당 박리 면적($m^2/J$)이 크게 되어 온도가 저하할수록 임계 박리 에너지가 작게되며, 박리를 생기게 하는 초기 손상 에너지가 작게 되어 박리 발생이 쉽게 됨을 알 수 있었다.

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CFRP 판 보강 RC보의 균열 및 박리 손상 모니터링 (Crack and Debonding Donitoring of RC Beams Strengthened with CFRP Plates)

  • 윤준호;한정헌;조두용;박선규
    • 한국구조물진단유지관리공학회 논문집
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    • 제15권4호
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    • pp.185-192
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    • 2011
  • CFRP 보강공법은 구조물에 내하력을 증가시키기 위해 사용되고 있는데 실제 교량에 적합하고 연구 활용성이 좋다. 하지만, CFRP로 보강된 콘크리트 보에서 휨파괴와 전단파괴 뿐만 아니라 부착파괴 또한 추가적으로 발생하게 된다. 이러한 CFRP 부착파괴는 취성파괴를 유발하게 된다. 따라서 이러한 CFRP로 보강된 콘크리트보 박리에 대한 모니터링은 매우 중요한 의미를 갖는다. 본 논문에서는 국부적인 손상 파악에 유리한 PZT센서를 이용한 임피던스 기반 손상검색 방법을 사용하여 CFRP로 보강된 콘크리트보에서 박리 모니터링에 대한 적용가능성을 검증해 보았다.