• 제목/요약/키워드: Composite-Material Panel

검색결과 151건 처리시간 0.018초

Post-buckling analysis of geometrically imperfect tapered curved micro-panels made of graphene oxide powder reinforced composite

  • Mirjavadi, Seyed Sajad;Forsat, Masoud;Barati, Mohammad Reza;Hamouda, AMS
    • Steel and Composite Structures
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    • 제36권1호
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    • pp.63-74
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    • 2020
  • The present research investigates post-buckling behavior of geometrically imperfect tapered curved micro-panels made of graphene oxide powder (GOP) reinforced composite. Micro-scale effects on the panel structure have been included based on strain gradient elasticity. Micro-panel is considered to be tapered based on thickness variation along longitudinal direction. Weight fractions of uniformly and linearly distributed GOPs are included in material properties based on Halpin-Tsai homogenization scheme considering. Post-buckling curves have been determined based on both perfect and imperfect micro-panel assumptions. It is found that post-buckling curves are varying with the changes of GOPs weight fraction, geometric imperfection, GOP distribution type, variable thickness parameters, panel curvature radius and strain gradient.

Multi-Objective Design Optimization of Composite Stiffened Panel Using Response Surface Methodology

  • Murugesan, Mohanraj;Kang, Beom-Soo;Lee, Kyunghoon
    • Composites Research
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    • 제28권5호
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    • pp.297-310
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    • 2015
  • This study aims to develop efficient composite laminates for buckling load enhancement, interlaminar shear stress minimization, and weight reduction. This goal is achieved through cover-skin lay-ups around skins and stiffeners, which amplify bending stiffness and defer delamination by means of effective stress distribution. The design problem is formulated as multi-objective optimization that maximizes buckling load capability while minimizing both maximum out-of-plane shear stress and panel weight. For efficient optimization, response surface methodology is employed for buckling load, two out-of-plane shear stresses, and panel weight with respect to one ply thickness, six fiber orientations of a skin, and four stiffener heights. Numerical results show that skin-covered composite stiffened panels can be devised for maximum buckling load and minimum interlaminar shear stresses under compressive load. In addition, the effects of different material properties are investigated and compared. The obtained results reveal that the composite stiffened panel with Kevlar material is the most effective design.

Nonlinear flexural analysis of laminated composite flat panel under hygro-thermo-mechanical loading

  • Kar, Vishesh R.;Mahapatra, Trupti R.;Panda, Subrata K.
    • Steel and Composite Structures
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    • 제19권4호
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    • pp.1011-1033
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    • 2015
  • In this article, large amplitude bending behaviour of laminated composite flat panel under combined effect of moisture, temperature and mechanical loading is investigated. The laminated composite panel model has been developed mathematically by introducing the geometrical nonlinearity in Green-Lagrange sense in the framework of higher-order shear deformation theory. The present study includes the degraded composite material properties at elevated temperature and moisture concentration. In order to achieve any general case, all the nonlinear higher order terms have been included in the present formulation and the material property variations are introduced through the micromechanical model. The nonlinear governing equation is obtained using the variational principle and discretised using finite element steps. The convergence behaviour of the present numerical model has been checked. The present proposed model has been validated by comparing the responses with those available published results. Some new numerical examples have been solved to show the effect of various parameters on the bending behaviour of laminated composite flat panel under hygro-thermo-mechanical loading.

Mechanical behavior test and analysis of HEH sandwich external wall panel

  • Wu, Xiangguo;Zhang, Xuesen;Tao, Xiaokun;Yang, Ming;Yu, Qun;Qiu, Faqiang
    • Advances in concrete construction
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    • 제13권 2호
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    • pp.153-162
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    • 2022
  • Prefabricated exterior wall panel is the main non-load-bearing component of assembly building, which affects the comprehensive performance of thermal insulation and durability of the building. It is of great significance to develop new prefabricated exterior wall panel with durable and lightweight characteristics for the development of energy-saving and assembly building. In the prefabricated sandwich insulation hanging wall panel, the selection of material for the outer layer and the arrangement of the connector of the inner and outer wall layers affect the mechanical performance and durability of the wall panels. In this paper, high performance cement-based composites (HPFRC) are used in the outer layer of the new type wall panel. FRP bars are used as the interface connector. Through experiments and analysis, the influence of the arrangement of connectors on the mechanical behaviors of thin-walled composite wall panel and the panel with window openings under two working conditions are investigated. The failure modes and the role of connectors of thin-walled composite wallboard are analyzed. The influence of the thickness of the wall layer and their combination on the strain growth of the control section, the initial crack resistance, the ultimate bearing capacity and the deformation of the wall panels are analyzed. The research work provides a technical reference for the engineering design of the light-weight thin-walled and durable composite sandwich wall panel.

철도차량 내장재용 복합재료 패널의 차음성능에 관한 연구 (A Study on the Sound Insulation Performance of the Composite-Material Panel for Railroad Vehicle)

  • 김봉기;김재승;김현실;강현주;김상렬
    • 한국철도학회논문집
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    • 제6권1호
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    • pp.10-14
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    • 2003
  • Since most of main noise sources of the railroad vehicle are transmitted to the passenger's ear through the vibration of the panel, the sound insulation performance of the panels should be high enough to protect the passenger's ear from the noisy environment. Specifically, the composite materials which are generally used for reducing the weight of the vehicle compartment have the low insulation performance, thus noise control actions should be taken appropriately by considering the insulation performance of the panels. In this study, the insulation performances of the inner/outer panels of the compartment are evaluated. In addition, the contribution of the insulation performance of aluminum door is estimated and compared to those of composite panels. The results can furnish an in-depth understanding of the insulation characteristics of the panel of railroad vehicle.

폐타이어를 이용한 목질고무 복합패널의 물성에 관한 연구 - 원료혼합비율에 따른 복합패널의 재질변화 - (Studies on Physical Properties of Wood-based Composite Panel with Recycled Tire Chip - Change of Properties on Composite Panel by Mixing Ratio of Combined Materials -)

  • 이원희;변희섭;배현미
    • Journal of the Korean Wood Science and Technology
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    • 제26권1호
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    • pp.70-75
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    • 1998
  • In this paper, the relationships between volumetric mixing ratio of rubber chip and physical and mechanical properties of wood/rubber composite panel was examined in order to investigate the mixture characteristics of wood and rubber chip. Because of the specific gravity of rubber differed from wood chip, physical properties of wood/rubber composite panel was shown very different values by mixing rate of chip element. Specific gravity in air-dry of composite panel was increased rapidly as volumetric percent of rubber chip was increased. Moisture content of composite panel was decreased as volumetric percent of rubber chip element was increased. This results was considered that wood weight is light and porosity material for moisture absorption. Compressive strength and modulus of rupture in bending test were decreased as volumetric percent of rubber chip increased. By mixing ratio control of chip elements, various wood/rubber composite panel can be applicable to every interior materials such as subfloor, playground, and exterior materials such as road blocks for recreational facilities in garden and forest and city parks.

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도로구조물 경량화를 위한 복합재료 샌드위치 패널에 관한 연구 (The Advanced Composite Sandwich Panels for Light Weight of Road Structures)

  • 한봉구
    • 한국도로학회논문집
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    • 제16권3호
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    • pp.1-8
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    • 2014
  • PURPOSES : The purpose of this paper is to demonstrate to the practicing engineers, how to apply the advanced composite materials theory to the road structures. For general construction material used, there is certain theoretical limit in sizes. For super road structure construction, the reduction in panel weight is the first step to take in order to break such size limits. METHODS : For a typical road structures panel, both concrete and advanced composite sandwich panels are considered. The concrete panel is treated as a special orthotropic plate. RESULTS : All types of advanced composite sandwich panels are considered as a self-weights less than one tenth of that of concrete panel. The concrete panel is treated as a special orthotropic plate to obtain more accurate result. CONCLUSIONS : Advanced composite sandwich panels are considered as a self-weights less than one tenth (10%) of that of concrete panel, with deflections less than that of the concrete panel. This conclusion gives good guide line for design of the light weight of road structures.

굽힘 및 비틀림 하중작용시 횡방향 모재균열을 갖는 복합재료 판넬 해석 (Analysis of a Composite Panel with Transverse Matrix Cracks under Bending and Twisting Moments)

  • 박정선;허해규;이수용
    • 대한기계학회논문집A
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    • 제21권6호
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    • pp.971-980
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    • 1997
  • This study is to investigate the stiffness degradation of a composite laminated panel including transverse matrix cracks subjected to bending and twisting moments. Micromechanics theory on the composite material is derived by introducing crack density. Iterative numerical scheme is developed to calculate the degraded composite stiffness which has nonlinear relation due to the crack density. The finite element method is used for structural analysis of the composite panel. Structural responses of the composite panel are examined for various laminated angles and crack density under the bending and twisting moments. Also, the effect of crack opening and closing is considered in the examination. It is realized that the matrix cracks may cause severe stiffness reduction and should be considered in the composite laminated panel.

ACP와 AUTODYN을 이용한 방호·방폭 보강 복합패널 구조해석 (Structural Analysis of Impact·Blast Resistant Composite Panel using ACP and AUTODYN)

  • Kim, Woonhak;Kang, Seokwon
    • 한국재난정보학회 논문집
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    • 제12권4호
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    • pp.432-439
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    • 2016
  • 방호 방폭 보강용 복합재료의 특성상 모델을 구성하고 사용하기 위해서는 재료 각각의 물성치가 필요하며, 이러한 물성 데이터를 도출하기 위해서는 수많은 실험을 통해 도출된 결과를 여러 계산식을 통하여 도출된 값으로 입력해야 하며, 일반적인 재료가 아닌 특수 목적용 소재의 경우는 이를 수행하는데 많은 어려움이 있다. 본 연구에서는 Ansys Workbench 환경에서 제공하는 복합재 적용 물성을 적용하여 ACP와 AUTODYN에서 방호 방폭 보강용 복합섬유 패널의 모델링 및 구조 해석을 수행하였다.

방호·방폭 보강용 복합섬유 패널 제작을 위한 기초연구 (Basic Study on Fiber Composite Panel Production for Impact·Blast Resistant)

  • Kim, Woonhak;Kang, Seokwon;Yun, Seunggyu
    • 한국재난정보학회 논문집
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    • 제11권2호
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    • pp.235-243
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    • 2015
  • 콘크리트 구조물의 방호 방폭성능을 향상시키기 위한 보강방법으로 배면보강이나 콘크리트 재료의 물성보강에 따른 방법과, 구조 부재나 지지물 등을 추가로 설치하여 저항성능을 향상시키는 방법 등을 고려하였을 때 경제적인 측면과 구조적인 측면에서 효율성이 떨어진다. 본 논문에서는 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 충전제로서 나노복합소재 및 접착제에 대한 기초 연구를 수행하였다. 그 결과 섬유복합패널 외피(아라미드-폴리에스터 비 6:4, 6.5:3.5)의 최대 인장강도 2,348MPa, 최대 신율 1.8%의 값을 얻었고, 나노복합소재와 접착제를 혼합한 충전제의 최대 인장전단접착강도 4MPa을 얻었다. 또한 나노복합소재로 제작한 충전제는 보통포틀랜드시멘트의 30%의 경량화의 결과를 얻었다.