• Title/Summary/Keyword: Glass epoxy composite

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Preparation of Amine-epoxy Adducts(AEA)/Thin Multiwalled Carbon Nanotubes (TWCNTs) Composite Particles using Dry Processes

  • Jung, Hyun-Taek;Cho, Young-Min;Kim, Tae-Ho;Kim, Tae-Ann;Park, Min
    • Carbon letters
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    • v.11 no.2
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    • pp.107-111
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    • 2010
  • We prepared the amine epoxy adducts (AEA)/thin multiwalled carbon nanotubes (TWCNTs) composite particles using nonsolvent based methods including dry mechano-chemical bonding(MCB) process and supercritical fluid (SCF) process. The resulting TWCNTs/AEA composite particles have been used as curing agents for urethane modified bispheol A type epoxy resin. The thermal, thermomechanical properties of the epoxy resins cured with TWCNTs/AEA composite particles were measured by DMA and the dispersion of CNT was characterized by SEM. Because of high degree of CNT dispersion, thermal and mechanical properties of the epoxy resin cured with TWCNTs/AEA composite particles prepared by SCF process are better than those cured with mechano-chemically prepared TWCNTs/AEA composite particles.

Effects of salt water environment on the mechanical behavior of composites (복합재료의 기계적 거동에 염수환경이 미치는 영향에 관한 연구)

  • Moon, Jin-Bum;Kim, Soo-Hyun;Kim, Chun-Gon
    • Composites Research
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    • v.23 no.1
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    • pp.44-50
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    • 2010
  • In this paper, two different experiments, namely, salt water spray and salt water immersion, were performed to reproduce the contact of composites with the seawater for three kinds of woven fabric composite material systems which would be used for the WIG(wing in ground effect)craft. After aging 140 days in the salt water environment, material properties of carbon/epoxy and glass/epoxy composite such as tensile, compressive and shear stiffness and strength, and inter-laminar shear strength (ILSS) were measured. By comparing baseline material properties with degraded ones, the effects of the salt water environment on the composite mechanical properties were evaluated. From the experiments, it was confirmed that the difference in aging conditions had very small influence on composite properties. And it was found that tensile strength of carbon/epoxy composites showed little degradation, but much more degradation was observed in glass/epoxy composites. And large degradations on matrix dominant properties were observed. The salt water could damage the fiber-matrix interface, matrix properties and the glass fiber.

Effect of coupling agent on the dielectric and mechanical properties of GFRP (GFRP의 유전적 및 기계적 특성에 미치는 계면결합제의 효과에 관한 연구)

  • 곽영순;신중홍;홍영기;조성수;박정후
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1988.10a
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    • pp.43-45
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    • 1988
  • This paper deals with the effect amino silane coupling agent for the composite insulating material (GFRP). Three kinds of coupling agent treatments are studied, that is treatment on glass fiber, epoxy resin and both glass fiber and epoxy resin. The result shows that the optimum electrical and mechanical properties is obtained for the sample treated on the glass fiber with 0.3% amino silane water solution.

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Probabilistic Approach for Fatigue Life of Composite Materials with Impact-Induced Damage (충격손상 복합재료의 피로수명에 대한 통계적 해석 연구)

  • Kang, Ki-Weon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.9
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    • pp.3148-3154
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    • 2010
  • This paper presents the probabilistic analysis for fatigue life of Glass/Epoxy laminates with impact-induced damage. For this, a series of impact tests were perfomed on the Glass/Epoxy laminates using instrumented impact testing machine. Then, tensile and fatigue tests carried out so as to generate post-impact residual strength and fatigue life. Two Parameter Weibull distribution was used to fit the residual strength and fatigue life data of Glass/Epoxy composite laminates. The residual strength was affected by impact energy and their variance decreased with increasing of impact energy. The fatigue life of impacted laminates was greatly reduced by impact energy and this trend depended on applied stress amplitude. Additionally, the variation of fatigue life was gradually decreased with the applied stress amplitude.

Dynamic Property Evaluation of Four-Harness Satin Woven Glass/epoxy Composites for a Composite Bogie Frame (복합소재 대차프레임용 4매 주자직 유리섬유/에폭시 복합소재의 진동특성평가)

  • Kim, Il Kyeom;Kim, Jung Seok;Seo, Sung Il;Lee, Woo Geun
    • Journal of the Korean Society for Railway
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    • v.16 no.1
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    • pp.1-6
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    • 2013
  • In this study, the natural frequency and damping ratio of a four-harness satin woven glass/epoxy composite material are evaluated by means of modal tests and a finite element analysis. To achieve this goal, glass/epoxy beam specimens with different lengths and thicknesses were manufactured via autoclave curing. In the test, the maximum damping ratio was found to occur at the lowest test frequency. As the test frequency increased, the damping ratio decreased exponentially to a critical value. After that value, the damping ratio increased gradually to the maximum test frequency.

Effect of silane coupling agent on the Dielectric Properties of Glass Cloth / Epoxy Composite (Glass Cloth / Epoxy 복합재료의 유전특성에 미치는 계면 결합제의 효과)

  • Kwak, Young-Soon;Hong, Young-Ki;Sin, Joong-Hong;Park, Chung-Hoo
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.353-355
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    • 1989
  • Composite insulating materials have the defect of interface. To minimize the defect of interface of GFRP (glass cloth reinforced plastics), coupling agent is treated. In this paper, the method of coupling agent treatment has been studied. The result shows that the optimum electric and mechanical properties is obtained for the sample treated on the glass fiber with 0.3% amino silane water solution.

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Prediction of Deterioration Rate for Composite Material by Moisture Absorption

  • Kim, Yun-Hae;An, Seung-Jun;Jo, Young-Dae;Bae, Chang-Won;Moon, Kyung-Man
    • Journal of Advanced Marine Engineering and Technology
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    • v.34 no.2
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    • pp.296-302
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    • 2010
  • If the fiber reinforced plastic is exposed to the moisture for a long period of time, most of moisture absorption occurs on the resin place, thus dropping cohesiveness between the molecules as the water molecules permeated between high molecular chains grant high molecular mobility and flexibility. Also as the micro crack occurs due to the permeation of moisture on the interface of glass fiber and epoxy resin, it is developed to the overall damage of interface place. Hence, the study on absorption is essential as the mechanical and physical properties of fiber reinforced composites are reduced. However, the study on absorption has the inconvenience needing to expose composite materials to fresh water or seawater for 1 month or up to 1 year. Therefore, this study has exposed fiber reinforced composites to fresh water and has developed a model with an accuracy of 98% after comparing the analysis value obtained by using ANSYS while basing on the experimental value of property decline by absorption and the basic properties of glass fiber and epoxy resin used in the experiment.

Impact Energy Behavior in Composite Materials of Ankle Foot Orthosis (A.F.O.) (족부보장구(Ankle Foot Orthosis, A.F.O.)용 복합재료의 충격에너지 거동)

  • Kim, Cheol-Woong;Song, Sam-Hong;Oh, Dong-Joon
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.330-335
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    • 2004
  • The needs of walking assistive device such as the Ankle Foot Orthosis (A.F.O.) are getting greater than before. However, most of the A.F.O. are generally imported rather than domestic manufacturing. The major reason of high import reliability is the rack of impact properties of domestic commercial products. Therefore, this research is going to focus on the evaluation of impact properties of the A.F.O. which has the high import reliability. Unfortunately, these kinds of researches are not performed sufficiently. This research is going to evaluate impact energy behavior in composite materials such as the glass/epoxy (S-glass, $[0/90]_{2S}$) and the aramid/epoxy (Kevlar-29, woven type, 8 ply) of ankle foot orthosis. The approach methods were as follows. 1) The history of impact load and impact energy due to the various velocities. 2) Relationship between the deflection and damage shape according to the impact velocities. 3) The behavior of absorbed energy and residual strength rate due to the various impact velocities.

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Functionalization of graphene nanoplatelets using sugar azide for graphene/epoxy nanocomposites

  • Bose, Saswata;Drzal, Lawrence T.
    • Carbon letters
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    • v.16 no.2
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    • pp.101-106
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    • 2015
  • We report a covalent functionalization of graphene nanoparticles (GnPs) employing 2,3,4-Tri-O-acetyl-${\beta}$-D-xylopyranosyl azide followed by fabrication of an epoxy/functionalized graphene nanocomposite and an evaluation of its thermo-mechanical performance. Successful functionalization of GnP was confirmed via thermal and spectroscopic study. Raman spectroscopy indicated that the functionalization was on the edge of the graphene sheets; the basal plane was not perturbed as a result of the functionalization. The epoxy/functionalized GnP composite system exhibited an increase in flexural modulus (~18%) and glass transition temperature (${\sim}10^{\circ}C$) compared to an un-functionalized GnP based epoxy composite.

Microstructure and Impactive Flexural Vibration Characteristics of Glass-Fabric/Epoxy Composite Beams (유리직물/에폭시 복합재료 보의 내부구조와 충격굽힘진동특성)

  • 서지웅;최낙삼
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 1999.04a
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    • pp.53.1-56
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    • 1999
  • The vibration behavior of glass-fabric reinforced plastic(GFRP) composite beams subjected to various transverse impacts has been investigated as a function of fiber orientation and void fraction. Theoretical results of resonant frequency damping coefficient and modal amplitude dispersion using the Euler-beam theory were obtained along with the finite element analysis which were compared with experimental ones Consequently it was shown that the transverse vibration characteristics were largely affected by fiber orientation and void fraction.

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