• Title, Summary, Keyword: Glass/epoxy

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

  • Kim, Sun-Kyu;Heo, Uk;Im, Kwang-Hee;Jung, Jong-An
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.21 no.4
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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.

Steel-Ball-Impact fracture Behavior of Soda-Lime Glass Plates Bonded with Glass Fabric/Epoxy Prepreg (직물형 유리섬유/에폭시 프리프레그로 피막된 판유리의 강구 충격 파괴 거동)

  • 김형구;최낙삼
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.20-25
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    • 2000
  • In order to study the impact fracture behavior of brittle materials, a steel-ball-impact experiment was Performed. Five kinds of materials were used in this study : soda-lime glass plates, glass/epoxy prepreg-one layer-bonded and unbonded glass plates, glass/epoxy prepreg-three layers-bonded and unbonded glass plates. Fracture patterns, the maximum stress and absorbed fracture energy were observed according to various impact velocities 40-120m/s. With increasing impact velocity, ring crack, cone crack, radial crack and lateral crack took place in the interior of glass plates. The generation of such cracks was largely reduced with glass/epoxy prepreg coating. Consequently, it is thought that the characteristics of the dynamic Impact fracture behavior could be evaluated using the absorbed fracture energy and the maximum stress measured at the back surface of glass plates.

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Surface Fracture Response of Glass Eabric/Epoxy Lamina-Bonded Glass Plates to Impact with a Small-Diameter Steel Ball (직물형 유리섬유/에폭시 복합재료로 피막된 판유리의 미소강구 충격에 의한 표면파괴거동)

  • 김형구;최낙삼
    • Composites Research
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    • v.13 no.4
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    • pp.75-82
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    • 2000
  • A small diameter steel-ball impact experiment was performed to study the impact resistance of the surface of glass plates bonded with glass fabric/epoxy lamina. Five kinds of materials were used in this study: soda-lime glass plates, glass/epoxy lamina(one layer)-bonded and unbonded glass plates, glass/epoxy lamina(three layers)-bonded and unbonded glass plates. The range of impact velocity was 40 120m/s. The maximum stress and absorbed fracture energy were measured on the back surface of glass plates. With increasing impact velocity, various types of surface cracks such as ring, cone, radial and lateral cracks took place in the interior near the impacted site of glass plates. The cracks drastically decreased with glass/epoxy lamina coating. The surface fracture behavior could be evaluated using the maximum stress and the absorbed fracture energy.

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Encapsulation Method of OLED with Inorganic Multi-layered Thin Films Sealed with Flat Glass (평판 유리로 봉인된 다층 무기 박막을 갖는 OLED 봉지 방법)

  • Park, Min-Kyung;Ju, Sung-Hoo;Yang, Jae-Woong;Paek, Kyeong-Kap
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.24 no.11
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    • pp.905-910
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    • 2011
  • To study encapsulation method for large-area organic light emitting diodes (OLEDs), red emitting OLEDs were fabricated, on which LiF and Al were deposited as inorganic protective films. And then the OLED was attached to flat glass by printing method using epoxy. In case of direct coating of epoxy onto OLED by printing method, luminance and current efficiency were remarkably decreased because of the damage to the OLED by epoxy. In case of depositing LiF and Al as inorganic protective films and then coating of epoxy onto OLED, luminance and current efficiency were not changed. OLED lifetime was more increased through inorganic protective films between OLED and flat glass than that without any encapsulation (8.8 h), i.e., 47 (LiF/Al/epoxy/glass), 62 (LiF/Al/LiF/epoxy/glass), and 84 h (LiF/Al/Al/epoxy/glass). The characteristics of OLED encapsulated with inorganic protective films (attached to flat glass) showed the possibility of application of protective films.

Study on the durability of fiber reinforced plastic by moisture aborsoption (흡수에 의한 FRP의 내구성에 관한 연구)

  • 문창권;구자삼
    • Journal of Ocean Engineering and Technology
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    • v.11 no.2
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    • pp.48-56
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    • 1997
  • This work has been investigated in order to study the influence of the moisture absorption on the mechanical pf the glass fiber/epoxy resein composites and the carbon fiber/epoxy resein composites. The types of glass fiber used in the glass fiber/epoxy resein composites were randomly oriented fiber and plain fabric fiber. And carbon fiber.epoxy resein composites was laminated with fabric prepreg which was formed with carbon fiber and epoxy resein. Both composites were immersed up to 100 days in distilled water at $80^{\circ}C$, and then dried up to 3 days in an oven at 80$80^{\circ}C$. Both composites were measured for the weight gain of water(wt.%) and tensile strength through immersion and dry time. Consequently, it was found that the tensile strength of thw glass fiber/epoxy resein composites and the carbon fiber/epoxy resein composites were reduced proportionally to the moisture absortion rate. Also, the tensile strength of glass fiber composites was decreased more than that of the carbon fiber composites. Additionally, it was found that the tensile strength of all composites which decreased by moisture absorption were partly recovered by drying in an oven at 80$80^{\circ}C$.

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Precise Drilling characteristics of glass fiber epoxy composite material (유리섬유 에폭시 복합재료의 정밀드릴가공 특성)

  • 김홍배
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.7 no.4
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    • pp.117-122
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    • 1998
  • Glass fiber epoxy composite material is widely used in the structures of aircrafts, robots and other machines because of their high specific strength, high specific stiffness and high damping. In order for the composite materials to be used in the aircraft structures or machine elements, accurate surfaces for bearing mounting or joint must be provided, which require precise machining. In this paper, the machinability of the glass fiber epoxy composite material was experimentally investigated. The results can be summarized as follows : 1. The entrance of hole is very good manufacturing existing, but exit come to occur sever surface exfoliation. 2. The cutting force in drilling of the glass fiber epoxy composite material is decreased as the drilling speed increased. 3. If the glass fiber epoxy composite material is drilling by the standard twist drill, then the hole recommand cutting condition is spindle speed 400∼600rpm, feed 40∼50mm/min.

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Investigation of Energy Absorption Property of Glass/Epoxy Composite Tubes with Bevel and Tulip Triggers (베벨 및 튤립 트리거를 갖는 유리섬유 복합소재 튜브의 에너지 흡수특성 평가)

  • Kim, Jung Seok
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.26 no.4
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    • pp.395-401
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    • 2017
  • Energy absorption capabilities and failure modes of circular tubes made of glass/epoxy with two trigger mechanisms were evaluated. Three types of glass/epoxy tubes were fabricated using a hand lay-up method with unidirectional and woven fabric prepregs tapes, and a filament winding method. The one end of the fabricated tubes was machined for the bevel trigger and tulip trigger. Then, crush tests were conducted at 10 mm/min loading speed, wherein the glass/epoxy tubes were crushed by a brittle fracturing mode combined with fragmentation and lamina-splaying modes. The UD glass/epoxy tubes with a bevel trigger and the filament winded tubes with a tulip trigger showed the maximum and minimum specific energy absorptions, respectively, with a difference of 9.3%. The tube with a tulip trigger exhibited a maximum reduction of 5.7% in the initial peak load; the tube with a bevel trigger showed a maximum increase of 2.9% in the specific energy absorption.

A Study on the Corrosion Control of Glass Flake Lining for Mild Steel in Marine Environment (해양환경 중에서 Glass Flake 라이닝 강재의 부식방지에 관한 연구)

  • Lim, Uh-Joh;Kim, Seong-Hoon
    • Journal of Fisheries and Marine Sciences Education
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    • v.12 no.2
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    • pp.164-175
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    • 2000
  • Port facilities and marine structures used in marine environment were encountered to corrosion damages because of the influence of Cl-. Generally, to protect these accidents, anti-corrosion paint and epoxy coating have been used. But they were still remained erosion-corrosion damage like impingement erosion, cavitation erosion and deposit attack. It is necessary to develope the new composite lining material in order to protective those corrosion damages. In this paper, polyester glass flake, vinylester glass flake lining and epoxy coating for SS400 were investigated by the electrochemical polarization test and the impingement-cavitation erosion test for corrosion behaviour under the sea water. The main results obtained are as follows ; 1) Epoxy coating appear potentiodynamic polarization behaviour, but polyester glass flake and vinylester glass flake lining do not appear potentiodynamic polarization behaviour. 2) Open circuit potential of polyester glass flake lining is more noble than that of epoxy coating and corrosion current density of polyester glass flake lining is less drained than that of epoxy coating in sea water. 3) Open circuit potential of vinylester glass flake lining is more noble than that of polyester glass flake lining and corrosion current density of vinylester glass flake lining is less drained than that of polyester glass flake lining in the sea water.

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A study on the optimal condition of the fabrication glass-cloth/epoxy composite material (Glass-cloth/epoxy 복합재료의 최적제작조건에 관한 연구)

  • Kwak, Young-Soon;Cho, Jung-Soo;Choi, Se-Won;Lee, Kyu-Chul;Lee, Jong-Ho
    • Proceedings of the KIEE Conference
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    • pp.68-71
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    • 1989
  • This paper is to investigate the optimal condition of fabrication for glass-cloth/epoxy composite material. According to the result in this paper, in fabrication of composite materials, the optimal condition of treatment for epoxy silane coupling agent is 1.5% water solution of silane coupling agent by weight. Then, % weight ratio of silane coupling agent VS, glass cloth is about 0.3%. And the optimal post cured condition of glass cloth/epoxy composite material is about 30 hours at 100$^{\circ}C$.

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Surface Fracture Behaviors of Unidirectional and Cross Ply Glass Fiber/Epoxy Lamina-Coated Glass Plates under a Small-Diameter Steel Ball Impact (일방향 및 직교형 유리섬유/에폭시 복합재로 피막된 판유리의 미소강구 충격에 의한 표면파괴거동)

  • Chang, Jae-Young;Choi, Nak-Sam
    • Composites Research
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    • v.22 no.4
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    • pp.33-40
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    • 2009
  • Fiber orientation effects on the impact surface fracture of the glass plates coated with the glass fiber/epoxy lamina layer were investigated using a small-diameter steel-ball impact experiment. Four kinds of materials were used: soda-lime glass plates, unidirectional glass fiber/epoxy layer(one ply, two plies)-coated, crossed glass tiber/epoxy layer (two plies)-coated glass plates. The maximum stress and absorbed fracture energy were measured on the back surface of glass plates during the impact. With increasing impact velocity, various surface cracks such as ring, cone, radial and lateral cracks appeared near the impacted site of glass plates. Cracks in the plate drastically diminished by glass fiber coating. The tiber orientation guided the directions of delamination and plastic deformation zones between the tiber layer and the glass plate. Impact surface-fracture indices expressed in terms of the maximum stress and absorbed energy could be used as an effective evaluation parameter of the surface resistance.