• Title/Summary/Keyword: 적층 판 이론

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Free Vibration Analysis based on HSDT of Laminated Composite Plate Structures Using Multi-scale Approach (멀티 스케일 접근 방법에 의한 복합소재 적층 판구조의 HSDT 기반 고유진동 해석)

  • Lee, Sang-Youl
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.34 no.1
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    • pp.61-71
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    • 2014
  • This study carried out finite element vibration analysis of composite plate structures for construction using multi-scale approaches, which is based on the higher-order theory. The finite element (FE) models for composite structures using multi-scale approaches described in this paper is attractive not only because it shows excellent accuracy in analysis but also it shows the effect of the material combination. The FE model is used for studying free vibrations of laminated composite plates for various fiber-volume fractions. In particular, new results reported in this paper are focused on the significant effects of the fiber-volume fraction for various parameters, such as fiber angles, layup sequences, and length-thickness ratios. It may be concluded from this study that the combination effect of fiber and matrix, largely governing the dynamic characteristics of composite structures, should not be neglected and thus the optimal combination could be used to design such civil structures for better dynamic performance.

Thermoelastic deformation and stress analysis of a FGM rectangular Plate (경사기능재료 사각 판의 열 탄성 변형과 응력 해석)

  • Kim,Gwi-Seop
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.31 no.1
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    • pp.34-41
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    • 2003
  • A Green's function approach is adopted for analyzing the thermoelastic deformation and stress analysis of a plate made of functionally graded materials (FGMs). The solution to the 3-dimensional steady temperature is obtained by using the laminate theory. The fundamental equations for thermoelastic problems are derived in terms of out-plane deformation and in-plane force, separately. The thermoelastic deformation and the stress distributions due to the bending and in-plane forces are analyzed by using a Green’Às function based on the Galerkin method. The eigenfunctions of the Galerkin Green's function for the thermoelastic deformation and the stress distributions are approximated in terms of a series of admissible functions that satisfy the homogeneous boundary conditions of the rectangular plate. Numerical examples are carried out and effects of material properties on thermoelastic behaviors are discussed.

A Study on the Optimal Design of Laminate for CNG composite vessel using ANSYS RSM (ANSYS RSM을 이용한 CNG차량 용기 필라멘트 와인딩 적층판 최적설계에 관한 연구)

  • Kim, Eui-Soo
    • Journal of the Korean Institute of Gas
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    • v.13 no.4
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    • pp.15-21
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    • 2009
  • The fiber reinforced composite material is widely used in the multi-industrial field where the weight reduction of the infrastructure is demanded because of their high specific modulus and specific strength. Pressure vessels using this composite material have two main merits which are to cut down energy by reducing weight and to have long-term life due to corrosion resistance. In this paper, we developed optimal design module of laminate for CNG composite pressure vessel winding E-glass/epoxy based on Von-Mises yield criterion, Tsai-Hill theory and stress ratio using finite element method and ANSYS RSM(Response Surface Method).

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Analysis of Composite Sandwich Plates with a Local Shear Deformations (국부전단변형을 고려한 복합샌드위치 평판의 해석)

  • JI, Hyo Seon;Chang, Suk Yoon
    • Journal of Korean Society of Steel Construction
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    • v.10 no.1 s.34
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    • pp.11-24
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    • 1998
  • The composite sandwich plate is constructed by combining two laminated facings with high strength and a thick core of light weight material. The governing equations for the analysis of bending of simply supported sandwich plates with laminated facings are derived and analysed using the analytical method including the local shear deformations. The accuracy of the approach is ascertained by comparing solutions from the sandwich plate theory with composite facings to the laminate plate theory. Since the present analysis considers the bending stiffness of the core and also the transverse shear deformations of the laminated facings, it is expected that the analysis is capable to analyze the general anisotropic laminated plates with global shear deformations.

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중형 수평축 풍력발전용 복합재 회전날개의 설계방법 개선연구

  • 공창덕;정석훈;백종진;장병섭;안주연
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2000.11a
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    • pp.26-26
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    • 2000
  • 본 연구에서는 풍력발전기용 복합재 회전날개의 설계단계에서 공력 설계 후 결정되어진 공력 형상을 기초로 하여 구조적 형상설계를 수행 할 때에 여러 가지 경우의 형상을 해석하여 이중 설계요구조건에 적합한 경우를 채택하는 시행착오 방법으로 인한 비효율적인 요소를 배재 하기 위해 고전 적층판 이론을 기초로 한 해석 프로그램을 사용하여 예비설계를 수행하는 수정된 설계절차를 제안하였으며 예비설계단계에서 신속하고 신뢰성 있는 해석결과를 얻을 수 있었다.(중략)

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Vibration Characterization of Cross-ply Laminates Beam with Fatigue Damage (피로 손상을 입은 직교 복합재료 적충보의 진동 특성)

  • 문태철;김형윤;황운봉;전시문;김동원;김현진
    • Composites Research
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    • v.14 no.3
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    • pp.1-9
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    • 2001
  • A new non-destructive fatigue prediction model of the composite laminates is developed. The natural frequencies of fatigue-damaged laminates under extensional loading are related to the fatigue life of the laminates by establishing the equivalent flexural stiffness reduction as a function of the elastic properties of sublaminates. The flexural stiffness is derived by relating the 90-ply elastic modulus reduction, and using the laminate plate theory to the degraded elastic modulus and the intact elastic modulus of other laminates. The natural frequency reduction model, in which the dominant fatigue mode can be identified from the sensitivity scale factors of sublaminate elastic properties, provides natural frequency vs. fatigue cycle curves for the composite laminates. Vibration tests were also conducted on $[{90}_2/0_2]_s$ carbon/epoxy laminates to verify the natural frequency reduction model. Correlations between the predictions of the model and experimental results are good.

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Free Vibrations and Strain Energy Anaylsis of Antisymmetric Cross-ply Laminted Plates (역대칭(逆対称) Cross-ply 다층판(多層板)의 자유진동(自由振動) 및 변형 에너지 해석(解釋))

  • Park, Moon Ho;Jin, Yoshimura;Takashi, Mikami;Park, Sung Jin
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.11 no.4
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    • pp.37-44
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    • 1991
  • A powerful analytical procedure and strain energy analysis to investigate the free vibration of antisymmetric cross-ply laminated plates, having one pair of opposite edges simply supported, are develped on the basis of the Yang, Norris abd Stavsky (YSN) theory. The equation of motion of the plate are solved by the use of collation method. A range of results are presented for plates to show the effects of modulus ratio and number of layers on natural frequency. In addition, an analysis of the strain energy distributions is used as an aid for the better understanding of the vibration characteristics of the plates.

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Bending, Vibration and Buckling Analysis of Functionally Graded Material Plates (점진기능재료(FGM) 판의 휨, 진동 및 좌굴 해석)

  • Lee, Won-Hong;Han, Sung-Cheon;Park, Weon-Tae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.4
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    • pp.1043-1049
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    • 2008
  • In this paper, we investigate the static response. natural frequencies and buckling loads of functionally graded material (FGM) plates, using a Navier method. The eigenvalues of the FGM plates and shells are calculated by varying the volume fraction of the ceramic and metallic constituents using a sigmoid function, but their Poisson's ratios of the FGM plates and shells are assumed to be constant. The expressions of the membrane. bending and shear stiffness of FGM plates art more complicated combination of material properties than a homogeneous element. In order to validate the present solutions, the reference solutions of rectangular plates based on the classical theory are used. The various examples of composite and FGM structures are presented. The present results are in good agreement with the reference solutions.

A Study on Stress Analysis for Design of Composites Shaft on Small Ship by Filament Winding Process (필라멘트 와인딩 공법에 의한 소형 선박용 복합재료 축 설계를 위한 응력해석에 관한 연구)

  • 배창원;임철문;왕지석;김윤해
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.3
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    • pp.617-622
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    • 2001
  • The purpose of this study is to design and the analyze the stress of composited shaft which is wound by filament winding method. The composites shaft has high strength and reduction in weight compared to metal shaft. The classical laminate plate theory(CLT) was used fro analysis the stress, and for structure design. In order to replace metal shaft by composites shaft, the diameter of shaft was determined to $\phi$ 40. The ration of diameter was determined to 0.4 for torsional moment with CLT. In this result of analyzing the stress, composites shaft was safe $30^{\circ}~60^{\circ}$C of winding angle, and was fractured on $90^{\circ}$.

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Damage detection in laminated beams by anti-optimization (반 최적화기법에 의한 적층복합보의 손상추적)

  • 이재홍
    • Computational Structural Engineering
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    • v.9 no.2
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    • pp.173-182
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    • 1996
  • The present study proposes a detection technique for delaminations in a laminated compoiste structure. the proposed technique optimizes the spatial distribution of harmonic excitation so as to magnify the difference in response between the delaminated and intact structures. The technique is evaluated by numerical simulation of two-layered aluminum beams. Effects of measurement and geometric noises are included in the analysis. A finite element model for a delaminated beam, based on the layer-wise laminated plate theory in conjunction with a step function to simulate ddelaminations, is used.

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