• Proceedings of the Korean Society of Disaster Information Conference
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• 2015.11a
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• pp.130-131
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• 2015

이 논문은 패널의 각 단층 구성 재료에 고인장, 경량화, 부착성능, 내화성능 등을 향상시켜 단층 각각의 개별적인 특수 성능과 복합패널 구성물로서의 방호방폭 성능을 극대화 할 수 있는 섬유복합패널 외피와 충전재(나노복합소재) 및 접착제에 대한 기초 연구를 수행하였다.

• Journal of the Society of Disaster Information
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• v.12 no.4
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• pp.373-380
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• 2016

In order to develop composite fiber panels that can maximize the protection and blast resistance of the existing structures by improving lightweight, high-strength and fireproof performances of the single layer material of precast panels, the basic properties of the inner and outer covers that are mixed with aramid fibers (AF) and polyester fibers (PF) were evaluated in this study. Also, a basic study was performed on the performance of composite fiber panels by testing Nano-sized composite materials that are lightweight and excellent in fire resistance for their compressive strength, bending strength and tensile strength.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2016.11a
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• pp.198-199
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• 2016

기존 콘크리트 구조물의 내력 및 처짐에 저항하기 위하여 섬유시트를 사용한 복합섬유 패널 보강재를 셋 앵커를 이용하여 콘크리트 구조물과 일체화시키는 공법을 개발하였다.. 본 연구에서 적용된 실험 결과에 의하면 엥커+에폭시 보강 I 시험체가 기준시험체에 비하여 최대하중이 3.13배 증가, 동일 앵커갯수인 앵커보강시험체에 비하여 1.14배 증가하여으며, 에폭시보강시험체는 기준시험체에 비하여 최대하중이 3.08배 증가하였으나 계면에서 섬유박리로 인한 취성 파괴가 발생하였다.

• Journal of the Korea Concrete Institute
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• v.14 no.4
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• pp.483-491
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• 2002

This paper summarizes the results of experimental studies concerning the flexural strengthening of reinforced concrete beams by the external bonding of the new reinforcement material, which is composite panel with an advanced fiber sheet bonded on light concrete precast panel. The structural behaviors of strengthened beams are compared with codes in terms of yield load and ultimate load, deflection, flexural stiffness, ductility. Thirty nine large-scale beams were tested experimentally to evaluate the strength enhancement provided by the composite panel. According to the results, it is shown that beams strengthened with composite panel are structurally efficient and that the strength of the strengthened beams are improved comparing with beams strengthened with fiber sheet.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.12 no.4
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• pp.599-606
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• 1999

복합 적층 판과 보강 재를 설치한 보강된 복합 적층 패널의 좌굴을 고려한 설계에서, 좌굴이 항상 구조물의 최종 파손을 의미하는 것은 아니므로 이들의 좌굴 및 좌굴 후 거동에 대한 정확한 이해와 연구가 필요하다. 본 연구에서는 유한요소 법을 이용하여 적층 메커니즘과 섬유 배향각, 적층 순서 등이 복합 적층 판과 보강된 복합 적층 패널의 좌굴 및 좌굴 후 거동에 미치는 영향을 체계적으로 해석하였고, 각 변수에 따른 좌굴 및 좌굴 후 거동 특성을 분석하였다.

• Composites Research
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• v.28 no.5
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• pp.291-296
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• 2015

In this study, structural design and analysis of the automobile bonnet is performed. The flax/vinly ester composite material is applied for structural design. The Vacuum Assisted Resin Transfer Molding-Light (VARTML) manufacturing method is adopted for manufacturing the flax fiber composite bonnet. The VARTML is a manufacturing process that the resin is injected into the fly layered-up fibers enclosed by a rigid mold tool under vacuum. A series of flax/vinyl ester composite panels are manufactured, and several kinds of specimens cut out from the panels are tested to obtain mechanical performance data. Based on this, structural design of the automobile bonnet is performed.

• Journal of the Society of Disaster Information
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• v.11 no.2
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• pp.235-243
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• 2015

The methods to improve the protection and explosion-proof performance of concrete structures include the backside reinforcement or concrete material property improvement and the addition of structural members or supports to increase the resistance performance, but they are inefficient in terms of economics and structural characteristics. This study is about the basic study on the fiber composite panel cover, and the nano-composite material and adhesive as the filler, to maximize the specific performance of each layer and the protection and explosion-proof performance as the composite panel component by improving the tensile strength, light weight, adhesion and fire-proof performances. The fiber composite panel cover (aramid-polyester ratios of 6:4 and 6.5:3.5) had a 2,348 MPa maximum tensile strength and a 1.8% maximum elongation. The filler that contained the nano-composite material and adhesive had a 4 MPa maximum tensile shear adhesive strength. In addition, the nano-composite filler was 30% lighter than the normal portland cement

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.343-346
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• 2010

형상기억합금이 삽입된 복합체는 힌지나 추가적 작동기 없이 그 자체로서 지능 구조의 역할을 할 수 있어 많은 분야에서 활발히 연구되고 있다. 본 논문에서는 형상기억합금(Shape Memory Alloy) 선이 삽입된 $\cap$자형 복합재를 제안하고, 형상기억합금과 모재가 정해진 경우의 곡률 변화에 영향을 주는 주요 설계 변수를 복합재의 너비, 두께, 형상기억합금의 편심률을 설계변수로 가정하고 유한요소 해석과 패널 제작 및 실험을 통해 검증한다. 먼저 라고다스(Lagoudas)모델을 형상기억합금의 구성방정식으로 이용한 유한요소해석모델을 구성하여 수치해석을 수행하고, 11 종류의 형상기억합금 선이 삽입된 유리섬유강화복합재(Glass Fiber Reinforced Plastic) 패널을 제작하여 열하중에 따른 곡률변화를 관찰한다. 해석결과와 실험결과의 비교를 통해 해석모델의 타당성을 검증하며, 해석을 통해 각 설계 변수들의 곡률변화에 대한 영향을 파악한다.

• Journal of Korean Association for Spatial Structures
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• v.10 no.2
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• pp.117-126
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• 2010

Experiment on flexural analysis of RC beams strengthened with composite material panel is presented. Recently, the strengthening of reinforced concrete structures using advanced fiber reinforced plastic (FRP) composites, and in particular the behavior of FRP-reinforced concrete structure is topic that has become very popular because of good corrosion resistance and easy for site handling due to their light weight. In this study, an efficient computational analysis using ABAQUS to predict the ultimate moment capacity of reinforced concrete beams strengthened with FRP is presented. Test parameters in this study are the shape of fiber arrangement (LT, DB, DBT) and the number of carbon fiber sheets (2ply, 3ply). When comparing with results of the analytical model, results of the experiments show similar values. Furthermore, reinforced concrete beam with FRP obtains improved effects for ultimate strength.

• Aerospace Engineering and Technology
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• v.12 no.2
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• pp.48-56
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• 2013

In this paper, the equivalent elastic properties of fiber reinforced plastic laminar are investigated using various homogenization schemes. Although there are several methods for predicting the equivalent elastic properties such as analytical formula or semi-empirical formula, most of them have some limitations or are not much accurate when handling new composite material consisting of various fiber, matrix and fiber-volume fraction ratio. To resolve the issues, computational homogenization scheme is adopted with a representative volume element (RVE) comprised of a set of finite elements. Finally, the equivalent elastic properties are obtained by applying periodic boundary conditions. The obtained results are compared with those by the existing methods and test results. Also its effect on structural analysis results of the composite satellite panel is investigated.