• Title/Summary/Keyword: braided

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Electrical applications of braided composite materials (브레이드 섬유강화 복합재료의 전기적 특성)

  • 한동희;조한구;한세원;박기호
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.882-885
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    • 2001
  • This paper aims to investigate the characteristics of braided thermoplastic composite and pressure relief for polymer arrester. In general, braided composite has potential for improved impact and delamination resistance. Manufacturing processes of the braided composite could also be automated and could potentially lead to lower costs. Therefore, in consideration of characteristics of pressure relief for polymer arrester, the fabric pattern of braided composite was decided. And polymer arrester module was manufactured with braid.

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Fabrication and Mechanical Characterization of Braided Carbon Fiber Reinforced Al Matrix Composites (Braided 탄소섬유강화 알루미늄 기지 금속복합재료의 제조 및 기계적 특성평가)

  • 김경태;이상관;홍순형
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.10a
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    • pp.131-134
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    • 2002
  • Braided carbon fiber reinforced Al matrix composites were developed and characterized. Braided carbon fiber preforms with braiding angles of $30^{\circ}$, $45^{\circ}$ and $60^{\circ}$ were manufactured by using a braiding machine. The manufactured braided carbon fibers were used as reinforcement to fabricate Al matrix composites by employing a pressure infiltration casting method. In the processing of pressure infiltration casting, important processing parameters such as melting temperature, preheating temperature of preform and applied pressure were optimized. Prediction of elastic constants on composites was performed by using the volume averaging method, which utilizes the coordinate transformation and the averaging of stiffeness and compliance constants based upon the volume of each reinforcement and matrix material. The elastic moduli of composites were evaluated by using Resonant Ultrasound Spectroscopy(RUS) method and compared with the elastic moduli obtained from static tensile test method.

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Prediction of Thermal conductivities of 3-D braided glass/epoxy composites using a thermal-electrical analogy (3차원 브레이드 유리섬유/에폭시 복합재료의 열전도도 예측에 관한 연구)

  • 정혁진;강태진;윤재륜
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.10a
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    • pp.52-55
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    • 2002
  • This paper examines the effective thermal conductivity of 3-D braided glass/epoxy composites. 3-D braided composites have a number of advantage over conventional laminate composites, including through-thickness reinforcement, and high damage tolerance and processability. The thermal properties of composites depend primarily on the microstructure of the braided preform and properties of constituent materials. A thermal resistance network model based on structure of the braided preform is proposed by using thermal-electrical analogy. In order to affirm the applicability theses solutions, thermal conductivities of 3-D braided glass/epoxy composites are measured

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Mechanical Properties Prediction by Manufacturing Parameters for Braided Composites

  • Kim, Myungjun
    • Journal of Aerospace System Engineering
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    • v.14 no.4
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    • pp.25-31
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    • 2020
  • The development of manufacturing technology for braided composites has led to farther extension of the applications in aerospace structures. Since the mechanical characteristics of braided composites are affected by various materials and manufacturing parameters, it is important to determine the parameters required to appropriately design the braided composite structures. In this study, we proposed a geometric model of RUC (repeating unit cell) for 2D braided composites, and predicted the mechanical properties according to the change of fiber volume fraction, fiber filament size, braiding angle, and gap between adjacent yarns by the yarn slicing technique and stress averaging method. Finally, we analyze the characteristics of mechanical properties according to each manufacturing parameter of the braided composite material.

Fabrication and Analytical Characterization of 2-D Braided Textile Metal Matrix Composites (2-D Braided Textile 금속복합재료의 성형과 특성 해석)

  • 이상관;김효준;변준형;홍순형
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.38-41
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    • 2001
  • A new 2-D braided textile metal matrix composite was developed and characterized. The constituent materials consist of PAN type carbon fiber as reinforcements and pure aluminum as matrices. The braided preforms of different braider yarn angles were fabricated. For a fixed bundle size of 12K, three braider yarn angles was selected: $30^{\circ}$, $45^{\circ}$, and $60^{\circ}$. The braided preforms were infiltrated with pure Al by vacuum assisted squeeze casting. Through the investigation of melt pressing methods and the effects of process parameters such as applied pressure, and pouring temperature, the optimal process conditions were identified as follows: applied pressure of 60MPa, pouring temperature of $800^{\circ}C$. Using the measured geometric parameters, 3-D engineering constants of metal matrix composites have been determined from the elastic model, which utilizes the coordinate transformation and the averaging of stiffened and compliance constants based upon the volume of each reinforcement and matrix material.

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Characteristics of polymer arrester with pressure relief structure (폴리머 피뢰기의 방압구조 및 특성)

  • Han, Dong-Hee;Cho, Han-Goo;Han, Se-Won
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07b
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    • pp.1109-1112
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    • 2004
  • This study reports on the pressure relief design and braided composite of surge arrester. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. As a solution, this study describes pressure relief design performance of arresters with braided composite module. In general, braided composite has Potential for improved impact and delamination resistance. Manufacturing processes of the braided composite could also be automated and could potentially lead to lower costs. Therefore, in consideration of characteristics of pressure relief for polymer arrester, the fabric pattern of braided composite was decided. And Polymer arrester module was manufactured with braid. The mechanisms of pressure occurrence and relief were investigated basically by analyzing arc energy and the correlation between thermal shock and indoor pressure in pressure relief test.

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Manufacture of arrester module using braided composite materials (브레이드 복합재료를 이용한 피뢰기 모듈 제조에 관한 연구)

  • Han, D.H.;Cho, H.G.;Han, S.W.;Park, K.H.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1467-1469
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    • 2002
  • This paper aims to investigate the characteristics of braided thermoplastic and thermosetting composite and pressure relief for polymer arrester. In general, braided composite has potential for improved impact and delamination resistance. Manufacturing processes of the braided composite could also be automated and could potentially lead to lower costs. Therefore, in consideration of characteristics of pressure relief for polymer arrester, the fabric pattern of braided composite was studied. And polymer arrester module was manufactured with braid.

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Laser-cut-type versus braided-type covered self-expandable metallic stents for distal biliary obstruction caused by pancreatic carcinoma: a retrospective comparative cohort study

  • Koh Kitagawa;Akira Mitoro;Takahiro Ozutsumi;Masanori Furukawa;Yukihisa Fujinaga;Kenichiro Seki;Norihisa Nishimura;Yasuhiko Sawada;Kosuke Kaji;Hideto Kawaratani;Hiroaki Takaya;Kei Moriya;Tadashi Namisaki;Takemi Akahane;Hitoshi Yoshiji
    • Clinical Endoscopy
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    • v.55 no.3
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    • pp.434-442
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    • 2022
  • Background/Aims: Covered self-expandable metallic stents (CMSs) are widely used for malignant distal biliary obstructions (MDBOs) caused by pancreatic carcinoma. This study compared the efficacy and safety of the laser-cut-type and braided-type CMSs. Methods: To palliate MDBOs caused by pancreatic carcinoma, the laser-cut-type CMSs was used from April 2014 to March 2017, and the braided-type CMSs was used from April 2017 to March 2019. The tested self-expandable metallic stents were equipped with different anti-migration systems. Results: In total, 47 patients received CMSs for MDBOs (24 laser-cut type, 23 braided-type). The time to recurrent biliary obstruction (TRBO) was significantly longer in the braided-type CMSs (p=0.0008), and the median time to stent dysfunction or patient death was 141 and 265 days in the laser-cut-type CMSs and braided-type CMSs, respectively (p=0.0023). Stent migration was the major cause of stent dysfunction in both groups, which occurred in 37.5% of the laser-cut-type CMSs and 13.0% of the braided-type CMSs. There were no differences in the survival duration between the groups. Conclusions: The TRBO was significantly longer for the braided-type CMSs with an anti-migration system than for the laser-cut-type. Stent migration tended to be less frequent with the braided-type CMSs than with the laser-cut-type CMSs.

Geometrical Modeling for Hybrid 3-D Braided Composites (하이브리드 삼차원 브레이딩 복합재료의 기하학적 모델링)

  • 한문희;강태진;윤재륜
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.10a
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    • pp.67-70
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    • 2003
  • To develop an effective geometric modeling is essential in order that precise mechanical properties and the geometrical properties of the 3-D braided composites can be estimated. RVE(representative volume element) was adopted fur geometrical modeling. RVE consisted of IC(inner unit cell), ISUC(interior surface unit cell) and ESUC(exterior surface unit cell). The whole geometrical model fur hybrid 3-D braided composites was developed.

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