• Title/Summary/Keyword: Tow prepreg

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Carbon Fiber Tow Spreading Technology and Mechanical Properties of Laminate Composites (탄소섬유 펼침 기술 및 이를 적용한 적층 복합재료의 기계적 특성)

  • Park, Sung Min;Kim, Myung Soon;Choi, Yoon Sung;Lee, Eun Soo;Yoo, Ho Wook;Chon, Jin Sung
    • Composites Research
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    • v.28 no.5
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    • pp.249-253
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    • 2015
  • This paper reports a study on a method for achieving lightweight thermoplastic laminate composites referred to as tow spreading technology. Thickness of an unspread 12 K carbon fiber tow is reduced by increasing the tow width from 7 mm to 20 mm. The polypropylene (PP) film was used to stabilize and impregnate the spread tow, covering it into a partially consolidated prepreg: 12 K carbon fiber spread tow/PP. Laminates were fabricated from the spread tow prepreg and control laminate composites were produced from unspread tow prepreg consisting of 12 K carbon fiber and PP. The void content, tensile and flexural properties of the composite laminates were investigated. Consequently, the spread tow laminate composite exhibited lower void content and improved mechanical properties.

Recent Research Trends in Carbon Fiber Tow Prepreg for Advanced Composites (탄소섬유 토우프리프레그 최신 연구동향)

  • Park, Yongmin;Hwang, Tae Kyung;Chung, Sangki;Park, Nohyun;Jang, Jun Yeol;Nah, Changwoon
    • Journal of the Korean Society of Propulsion Engineers
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    • v.21 no.2
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    • pp.94-101
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    • 2017
  • Tow Prepreg is the intermediate material for filament winding process that has been "pre-impregnated fiber tow" with resin system. As "dry filament winding" process emerges as a reliable alternative to conventional filament winding (called "wet filament winding") process, interest in tow prepreg as a material for dry filament winding is rising as well. In this article, we have reviewed the recent research trends in carbon fiber tow prepreg for high-performance rocket motor cases, fuel tanks for hydrogen vehicles and other high-quality commercial pressure vessels.

Variation of Tow Geometry according to Mold Property and Shear Angle during Draping on 3D Curved Surfaces (3 차원 곡면 드레이핑 중 금형의 물성과 전단각에 따른 토우구조의 변화)

  • Chung, Jee-Gyu;Chang, Seung-Hwan
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2005.04a
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    • pp.154-157
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    • 2005
  • This paper aims to investigate the tow deformation pattern with respect to shear angle and mold property during draping of plain weave carbon/epoxy prepreg. Aluminum and PVC foams with different foam density are used for the draping hemisphere molds with 250 mm diameters. Microscopic observation reveals that tow parameters like crimp angle and Y-directional tow intervals are influenced by shear angle and mold density at the same time. The correlation between crimp angle and Y-directional tow interval is also found out.

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Microscopic Investigation on the Micro-Deformation of Draped Helmet Structure Made of fabric Composite (직물 복합재료를 이용한 드레이핑 헬멧의 미소 변형 관찰)

  • 장승한
    • Composites Research
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    • v.16 no.4
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    • pp.29-35
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    • 2003
  • In this paper. various tow parameters such as equivalent tow thickness, amplitude of longitudinal tow and tow intervals were investigated and compared with each other by using microscopic observation to find out the exact deformation patterns between both directions of the fabric structure(Longitudinal and Transverse Directions). And those observation results were compared with bias extension. biaxial tests results with dry fabric which has the same tow structure as the draped helmet materials and also compared with prepreg specimen which is cured by autoclave moulding without vacuum and pressure condition. Specimens for the observation were taken from draped helmet which is made of fabric composite(Five Harness Satin Weave). From the observation results, it was found that there are different deformation pattern between tow directions and effect of geometric condition on the deformation of the fabric materials during draping process was verified.

A Study on the Micro-deformation of Plain Weave Carbon/Epoxy Composite-Polymer Foam Sandwich Structures during Curing (평직 탄소섬유 복합재료-고분자 포움 샌드위치 구조의 성형 중 미소변형에 관한 연구)

  • Kim Yong-Soo;Chang Seung-Hwan
    • Composites Research
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    • v.17 no.6
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    • pp.28-36
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    • 2004
  • Micro-tow deformation during forming of PVC foam-fabric composite sandwich structure is investigated to find out the correlation between forming condition and material deformation. The foams used in this research are PVC foams which have 4 different densities and the fabric composite is Carbon/epoxy prepreg which is plain weave (3k) as a skin material. Tow parameters such as crimp angle and tow amplitude are measured using microscope and a proper image tool and are compared with each other. In order to find out the effect of foam deformation during forming on tow deformation the compressive tests of foams are performed in three different environmental temperatures ($25^{\circ}C$, $80{\circ}C$, $125^{\circ}C$). The microscopic observation results show that the micro tow deformations are quite different from each other with respect to the foam density and forming pressure.

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.

A Study on the Manufacturing Processability of Automatic Winding Device for Manufacturing Strand Specimens (스트랜드 시편 제작 장치의 제작 공정성 연구)

  • Cha, Jae Ho;Jang, Jeong Keun;Lee, Bo Mi;Yoon, Sung Ho
    • Composites Research
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    • v.33 no.5
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    • pp.315-320
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    • 2020
  • In this study, when strand specimens were manufactured using an automatic winding device to obtain uniform strand specimens, analysis and test were conducted to investigate the effect of thermal expansion of the mandrel on strand specimens. Also, necessity of changing materials and mandrel configuration was checked. According to the results, strand specimen received unintended tension that was created by thermal expansion of the mandrel and this unintended tension depended on the curing temperature and position of specimens. Tensile test was conducted to check that initial tension affected on the performance of carbon fiber tow prepreg. All other conditions were fixed and only the initial tension was controlled at 40 N, 60 N, and 80 N. From the results of analysis and test, neither additional tension and tension deviation due to the thermal expansion of the mandrel and the initial tension difference had a significant effect on tensile test results, because carbon fiber had sufficiently high strength compared with tension. Therefore, it was confirmed that the change of the mandrel material and configuration of the automatic winding device was unnecessary.

Effect of Carbon-based Nanofillers on the Toughening Behavior of Epoxy Resin

  • Lee, Gi-Bbeum;Kim, Haeran;Shin, Wonjae;Jeon, Jinseok;Park, In-Seok;Nah, Changwoon
    • Elastomers and Composites
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    • v.56 no.3
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    • pp.179-186
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    • 2021
  • Carbon-based nanofillers, including nanodiamond (ND) and carbon nanotubes (CNTs), have been employed in epoxy matrixes for improving the toughness, using the tow prepreg method, of epoxy compounds for high pressure tanks. The reinforcing performance was compared with those of commercially available toughening fillers, including carboxyl-terminated butadiene acrylonitrile (CTBN) and block copolymers, such as poly(methyl methacrylate)-b-poly(butyl acrylate)-b-poly(methyl methacrylate) (BA-b-MMA). CTNB improved the mechanical performance at a relatively high filler loading of ~5 phr. Nanosized BA-b-MMA showed improved performance at a lower filler loading of ~2 phr. However, the mechanical properties deteriorated at a higher loading of ~5 phr because of the formation of larger aggregates. ND showed no significant improvement in mechanical properties because of aggregate formation. In contrast, surface-treated ND with epoxidized hydroxyl-terminated polybutadiene considerably improved the mechanical properties, notably the impact strength, because of more uniform dispersion of particles in the epoxy matrix. CNTs noticeably improved the flexural strength and impact strength at a filler loading of 0.5 phr. However, the improvements were lost with further addition of fillers because of CNT aggregation.