• Title/Summary/Keyword: Glass fiber reinforced plastics

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Effect of Bonding Surface Laser Patterns on Interfacial Toughness of GFRP/Al Composite (GFRP/Al 복합재료의 접합부 레이저 패턴이 계면인성에 미치는 영향)

  • Woo Yong Sim;Yu Seong Yun;Oh Heon Kwon
    • Journal of the Korean Society of Safety
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    • v.38 no.2
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    • pp.1-7
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    • 2023
  • Fiber-metal laminates (FMLs) and polymer matrix composites (PMCs) are formed in various ways. In particular, FMLs in which aluminum is laminated as a reinforced layer are widely used. Also, glass fiber-reinforced plastics (GFRPs) are generally applied as fiber laminates. The bonding interface layer between the aluminum and fiber laminate exhibits low strength when subjected to hot press fabrication in the event of delamination fracture at the interface. This study presents a simple method for strengthening the interface bonding between the aluminum metal and GFRP layer of FML composites. The surfaces of the aluminum interface layer are engraved with three kinds of patterns by using the laser machine before the hot press works. Furthermore, the effect of the laser patterns on the interfacial toughness is investigated. The interfacial toughness was evaluated by the energy release rate (G) using an asymmetric double cantilever bending specimen (ADCB). From the experimental results, it was shown that the strip type pattern (STP) has the most proper pattern shape in GFRP/Al FML composites. Therefore, this will be considered a useful method for the safety assessment of FML composite structures.

Research on Mechanical Properties and Characteristics of Hybrid Composites for Boat (보트에 적용되는 하이브리드 복합재에 대한 기계적 특성 연구)

  • Cho, Je-Hyoung;Kim, Sung-Hoon;Yoon, Sung-Won;Ha, Jong-Rok;Kim, Myung-Hyun
    • Journal of Welding and Joining
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    • v.34 no.2
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    • pp.22-29
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    • 2016
  • Recently, Application of composite materials are increased in transport area for weight reduction. Also, Related technical developments have been implemented actively at domestic and abroad. In particular, The carbon fiber has high strength and ultra light property higher than stainless steel, aluminum, GFRP as Eco-friendly material. Carbon fiber contribute to improving the environmental effect such as fuel saving, expansion of loadage, reducing the exhaustion of carbon dioxide through the weight reduction of transport area. In addition, The carbon fiber is applied to the ship in the area of race yacht, luxury cruise boat as weight reduction and high added-value materials, but there is limited application for general boat because price of carbon fiber is very expensive. For the weight reduction of general boat hull, being used as structure materials, glass fiber and carbon fiber are applied to hull with form of hybrid composite materials, but application of domestic and research for development are incomlete. In this study, An evaluations of mechanical strength property and fatigue strength are performed on composite materials by hybrid weaving of glass fiber and carbon fiber and composite materials forming method by hybrid forming.

Enhancing the Mechanical Properties of Z-Spring by Implementing CF&GF Hybrid Prepreg Lamination Patterns (CF&GF Hybrid Prepreg 적층 패턴에 따른 Z-Spring의 기계적 물성 향상에 관한 연구)

  • Kim, Jeong-Keun;Choi, Sun-Ho;Kim, Young-Keun;Kim, Hong-Gun;Kwac, Lee-Gu
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.3
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    • pp.53-59
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    • 2021
  • In vibration-free vehicles such as limousine buses, the vibration is minimized by installing an air spring instead of the leaf spring used in the existing freight cars to prevent the damage to the loaded cargo from shocks generated during movement. In the existing vehicles, steel structures support the air spring system. This study was aimed at replacing the steel structures used in the Z-spring by carbon fiber and glass fiber reinforced plastics. In addition, the mechanical properties (elastic modulus, tensile strength, and shear strength) of carbon fiber and glass fiber prepreg were derived using specimens molded with the corresponding prepreg. The final goal was to develop a material lighter than the conventional steel material but with enhanced mechanical properties. Although the CF prepreg exhibited excellent mechanical properties, the production cost was extremely high. To overcome this limitation, hybrid composites with GF prepreg were examined, which are expected to be promising future materials.

Basic Design of High-Speed Riverine Craft Made of Carbon Fiber Reinforced Polymer

  • Han, Zhiqiang;Choi, Jung-kyu;Hwang, Inhyuck;Kim, Jinyoung;Oh, Daekyun
    • Journal of the Society of Naval Architects of Korea
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    • v.57 no.4
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    • pp.241-253
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    • 2020
  • The Small-Unit Riverine Craft (SURC) is a small high-speed vessel used by navies and marine corps in relatively shallow waterway environments, such as riverine areas or littoral coasts. In the past, SURCs have primarily been rigid-hulled inflatable boats constructed using composite materials such as glass fiber reinforced plastics. More recently, single-hull SURCs have been manufactured using aluminum for weight reduction. In this study, a Carbon Fiber Reinforced Polymer (CFRP) material was applied instead to examine its feasibility in the basic design of an SURC with a hull length of 10 m. The CFRP structural design was obtained using the properties of a marine CFRP laminate, determined in a previous study. Next, the designed CFRP SURC was modeled to confirm its functionality, then compared with existing aluminum SURCs, indicating that the CFRP SURC was 41.49 % lighter, reduced fuel consumption by 30 %, and could sail 50 NM further for every hour of engine operation. A method for reducing the high cost of carbon fiber was also proposed based on the adjustment of the carbon fiber content to provide the optimum strength where required. The data developed in this study can be used as a basis for further design of CFRP craft.

Developing Advanced Total Recycling Method of FRP Boats (FRP선박의 일괄 재처리 방법의 개선)

  • Lee, Seung Hee;Yoon, Koo Young
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.16 no.1
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    • pp.53-59
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    • 2013
  • Since 1990s, the major recycling methods for mechanical recycling of FRP(Fiber Reinforced Plastics)boats has involved shredding and grinding of the scrap FRP in a new recycled product. But still it leads to secondary problem such as air pollution, unacceptable shredding noise level and few limited applications. This study is to propose a newly advanced method which is more efficient and environment friendly waste FRP regenerating system. As extracting FRP layer and making the recycled fiber for recycled-fiber reinforced concrete(RFRC) from waste FRP, the recycling process has some merits in a sense of the recycling energy and the environmental effects. In this study, for those tasks, spectro-chemical differentiation method and coloring water-soluble dye treatment makes the roving layer more distinguishable photophysically. Also that has remarkably reduced safety hazards and energy. Using the mechanical properties of polymers and composite, FRP with the orthotropic and laminated plastic structure has been easily separated in the new extracting system. Also the new method has introduced five kind of separating manuals for the some different compositions of FRP boats. The roving fiber of laminated glass-fiber layer is as good as the polyvinyl fiber which is cost-high commercial fiber to increasing strength of concrete products. The early study has shown the effectiveness of laminated glass-fiber layer which also is chemical-resistant due to the resin coating. These results imply that more efficient and environment friendly recycled glass fiber can be better applied to the fiber reinforced concrete(FRC) substitute and this study also has shown wide concrete applications with RFRC from the waste FRP boat.

fiber Orientation Effects on the Acoustic Emission Characteristics of Class fiber-Reinforced Composite Materials (유리섬유강화 복합재의 AR특성에 대한 섬유배향 효과)

  • Kim, Jung-Hyun;Woo, Sung-Choong;Choi, Nak-Sam
    • Journal of the Korean Society for Nondestructive Testing
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    • v.23 no.5
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    • pp.429-438
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    • 2003
  • The effects of fiber orientation on acoustic emission(AE) characteristics have been studied for the unidirectional and satin-weave, continuous glass-fiber reinforced plastic(UD-GFRP and SW-GFRP) tensile specimens. Reflection and transmission optical microscopy was used for investigation of the damage zone of specimens. AE signals were classified as different types by using short time fourier transform(STFT) : AE signals with high intensity and high frequency band were due to fiber fracture, while weak AE signals with low frequency band were due to matrix and interfacial cracking. The feature in the rate of hit-events having high amplitudes showed a process of fiber breakages, which expressed the characteristic fracture processes of individual fiber-reinforced plastics with different fiber orientations and with different notching directions. As a consequence, the fracture behavior of the continuous GFRP could be monitored as nondestructive evaluation(NDE) through the AE technique.

Analysis the 10kW-grade Rotor Blade with Fiber Reinforced Plastics (F.R.P로 제작된 10kW급 소형 Rotor Blade의 특성 분석)

  • Son Choong-Yul;Kim Keon-Hoon;Shin Jong-Yeon;Lee Jung-Tak
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2005.04a
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    • pp.575-582
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    • 2005
  • Wind Turbines of big scale of modem stage are made of a part glass F.R.P. Carbon Reinforced Plastic and Kevlar can be used 0 reinforcement but those are not economical in big scale of Wind Turbines. In this study life sized 10kW-class Rotor Blade is made of F.R.P. which is high stiffness and good dynamic behavior characteristic for light weight. It is accomplished an experimental research of Bending analysis blade. Bending analysis blade are calculated with F.E. Analysis performed with commercial F.E.M program ANSYS. Finally, experimental research is compared with F.E. Analysis. The results indicate that experimental values have good agreements with the F.E. Analysis.

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Flexural Behaviors of Sandwich Panels of Polymer Mortar Reinforced with GFRP (GFRP보강 폴리머 모르타르 샌드위치 패널의 휨 거동)

  • 지경용;연규석;유근우;김남길;권윤환
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.159-164
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    • 2001
  • In this study, a polymer mortar sandwich panel (PMSP) was developed : Core was made with the polymer mortar whose compressive strength was about 840 kgf/$\textrm{cm}^2$, and both facings were made with the glass fiber reinforced plastics (GFRP). The results showed that the strain energies and the ductility indices increased 16-340 times and 2-8 times, respectively, as the thicknesses of facings increased from 0.6 to 3.0mm with fixing the core thickness to constants (12-36mm). On the other hand, these values showed a tendency of decrease as the core thickness increased regardless of thickness of facings. A set of basic data for the structural analysis could be provided by investigating the correlations, within the scope of this research, between the resisting moment and the thicknesses of core and facings.

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Evaluation of Fracture Detection Function for the FRP by Electrical Resistance Measurement (전기저항 측정에 의한 FRP의 파괴 예측 기능의 평가)

  • Sin, Sun-Gi;Kim, Yeong-Hui;Lee, Jun-Hui
    • Korean Journal of Materials Research
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    • v.12 no.2
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    • pp.135-139
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    • 2002
  • Carbon powders (CP) and carbon fiber (CF) were introduced info glass fiber reinforced plastics (FRP) composites to obtain fracture detection function. The composites were evaluated through the relation between a load-displacement curve and an electrical resistance change curve in three point bending test. CP containing FRP (CP-FRP) has a sensitivity of electrical resistance change at much lower load level than CF containing FRP (CF-FRP). In loading-unloading tests, CP-FRP showed a large amount of residual electrical resistance which enables the estimation of loading hysteresis.

Experimental Study on Flexural Behavior of RC Slab Strengthened by FRP Sheet and GSP (FRP 쉬트 및 GSP로 보강된 RC 슬래브의 휨거동에 관한 실험적 연구)

  • Ahn, Ki-Man;Kim, Kwang-Soo;Kim, Tae-Wan;Park, Sun-Kyu;Lee, Young-Jae
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.185-188
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    • 2006
  • Recently, an improved capacity for RC bridges is required by their deterioration or necessary to carry traffic increase. Strengthening is known as a better way to improve capacity of bridges than reconstructing. Fiber Reinforced Plastics (FRP) is introduced as one of the best strengthening structures in this paper. It is also known as an economical improvement. Therefore, FRP sheet and Glass Fiber-Steel Composite Plate (GSP) in this research were used in strengthening slab of RC bridges. Experimental data from the strengthening will be helpful to better understand the slab behavior and an effect of the strengthening.

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