• Title/Summary/Keyword: 복합적층판

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Characteristic of Impact Behavior of Laminated Composite Plates due to Initial Stress (복합적층판의 초기응력에 의한 충격거동 특성)

  • Kim, Seung--Deog;Kang, Joo-Won;Kwon, Suk-Jun
    • Journal of Korean Association for Spatial Structures
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    • v.11 no.3
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    • pp.77-83
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    • 2011
  • Laminated composite plates have shown their superiority over metals in applications requiring high specific strength, high specific modulus, and so on. Therefore, they have used in various industry. However, they have poor resistance to impact compared to typical metal materials. To resolve this problem by many researchers for a variety of studies have been attempted. This study investigates characteristic of impact behavior of laminated composite plates due to initial stress. Using finite element program which involved the indentation law, we investigate characteristic of impact behavior of laminated composite plates due to initial stress.

Investigation of Low Velocity Impact Behavior of Laminated Composite Plates Considering the Stacking Method (적층방법에 따른 복합적층판의 저속충격거동 조사)

  • Kim, Seung-Deog;Kwon, Suk-Jun
    • Journal of Korean Association for Spatial Structures
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    • v.10 no.4
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    • pp.75-83
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    • 2010
  • Laminated composite plates have shown their superiority over metals in applications requiring high specific strength, high specific modulus, and so on. Therefore, they have used in various industry. However, they have poor resistance to impact compared to typical metal materials. So, many researchers have investigated about impact behavior of laminated composite plate. To investigate impact behavior of laminated composite plate, we have to calculate contact force between impactor and laminated composite plate at the first. Impactor's equation of motion, plate's equation of motion and correlations for indentation were solved to know the contact force at the same time. In this study, low velocity impact behavior of composite plate was investigated using the finite element program which is involved the classical Hertzian law, Sun's law and Sun & Yang's experimental law and Sun & Tan's experimental law considering the stacking method.

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Probability Analysis for Impact Behavior of Composite Laminates Subjected to Low-Velocity Impact (저속충격을 받는 복합적층판의 충격거동에 대한 확률분포 특성)

  • Ha, Seung-Chul;Kim, In-Gul;Lee, Seok-Je;Cho, Sang-Gyu;Jang, Moon-Ho;Choi, Ik-Hyeon
    • Composites Research
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    • v.22 no.6
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    • pp.18-22
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    • 2009
  • In this paper, we examined impact force and impact behavior through low velocity impact tests of composite laminates. And through c-scan as nondestructive inspection, explored the damaged area being difficult to examine with the visual inspection. Through CAI tests, we also measured the compression strength of composite laminates subjected to low velocity impact. To examine the characteristics of impact behavior measured from low velocity impact test, nondestructive inspection, and CAI test, the simulated data are generated from the test data using Monte-Carlo simulation, then represented it by probability distribution. The testing results using visible stochastic distribution were examined and compared.

Bending, Free Vibration and Buckling Analysis of Anisotropic Composite Laminated Plate and Shell Structures (비등방성 복합적층판 및 쉘 구조의 휨, 자유진동 및 좌굴해석)

  • Yoon, Seok Ho
    • Journal of Korean Society of Steel Construction
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    • v.11 no.1
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    • pp.55-67
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    • 1999
  • The ratios of elastic to shear modulus of the structures as laminated composite plates and shells, are very large. They are much susceptible to effect of shear deformation. In order to obtain the accurate solutions of laminated composite plate and shells, the effects of shear strain should be considered for the analysis and design of them. Especially, the more exact solution can be obtained in applying to higher-order shear deformation theory. Therefore, in this paper, the third-order shear deformation theory is used to present the distributions of bending, the characteristics of natural frequencies and the buckling load according to the effects of ply orientation, number of layers for the laminated composite plates and shells with simply supported boundary conditions.

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Papers : Panel Flutter Analysis of Isotropic and Composite Plates Including Structural Damping (논문 : 구조감쇠를 고려한 등방성 평판 및 복합적층판의 패널 플러터 해석)

  • Gu, Gyo-Nam
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.3
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    • pp.115-122
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    • 2002
  • 구조감쇠가 복합적층판의 초음속 패널 플러터에 미치는 영향을 연구하기 위해 에너지법을 활용하여 지배방정식을 유도하였다. 구조 모델링은 일반적인 고전 적층판 이론을 적용하고 이의 해석은 진동 모우드를 가정하는 Rayleigh-Ritz법을 이용하였다. 비정상 공기력은 피스톤 이론(piston theory)을 적용하였다. 구조감쇠가 패널의 플러터에 미치는 일반적인 영향을 고찰하기 위해 등방성 평판의 구조감쇠의 크기에 따른 임계동압을 계산하였으며 이로부터 구조감쇠가 플러터 안정성을 감소시킬 수 있음을 확인하였다. 또한 복합적층판의 적층각에 따른 임계동압을 계산하여 패널 플러터와 구조감쇠와의 관계를 파악하였다. 구조감쇠는 낮은 공력감쇠에서는 플러터 안정성에 중요한 역할을 하지만 높은 공력감쇠에서는 거의 영향을 미치지 않았다.

Vibration Analysis of Composite Laminated Plates Considered in Material-Nonlinearity (재료비선형을 고려한 복합적층판의 진동해석)

  • Seok, Keun-Yung;Kang, Joo-Won;Shin, Young-Shik
    • Journal of Korean Association for Spatial Structures
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    • v.6 no.4
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    • pp.45-52
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    • 2006
  • FRP laminated plates have strong material-nonlinearity. Through vibration Analysis of FRP laminated plates, the result of nonlinearity analysis is compared with the result of linearity analysis according to stacking angle and squency. This study is a fundamental study about displacement in nonlinearity dynamic behavior of FRP laminated plates.

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Stacking method of thick composite laminates considering interlaminar normal stresses (층간수직응력을 고려한 두꺼운 복합적층판의 적층방법)

  • 김동민;홍창선
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.12 no.5
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    • pp.944-951
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    • 1988
  • Global-Local Laminate Variational Model is utilized to investigate the characteristics of interlaminar stresses in thick composite laminates under uniform axial extension. Various laminates with different fiber orientation and stacking sequences are analyzed to observe the behavior of interlaminar normal stresses. From this result, the interlaminar normal stress distribution along the laminate interfaces is examined and discussed with an existing approximation model. The repeated stacking of Poisson's ratio symmetric sublaminates is found to be the best stacking method of thick composite laminates to reduce the interlaminar normal stresses for the prevention of the free-edge delamination.

Nonlinear Analysis of Composite Laminates Subjected to Low-Velocity Impact (복합적층판의 저속충격 거동에 대한 비선형 해석)

  • Choi, Ik-Hyeon;Hong, Chang-Sun;Lee, In
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.3
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    • pp.757-770
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    • 1991
  • 본 연구에서는 조속충격을 받는 복합적층판의 거동에 대해 횡전단변형과 대처 짐효과를 동시에 고려하여 선형해석한 결과와의 차이를 비교, 검토하여 저속충격무제 의 해석에 있어서 비선형해석의 중요성을 보이는데 있다.그리고 충격체의 질량과 속도가 충격하중과 판의 거동, 그리고 동적 변형도등에 미치는 영향을 파악하여 복합 적층판의 외부 물체에 의한 저속충격문제를 이해 하고자 한다.

Design of Composite Laminates by Consideration of Manufacturability (제작성을 고려한 복합적층판의 설계)

  • 김정석;김천곤;홍창선
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.264-267
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    • 1999
  • 복합적층판은 일반적으로 균일한 두께를 갖는 평평한 구조물을 형성하게 된다. 그러나 실제 적용시 적층판의 테이퍼링(tapering)이 요구되는 경우가 존재한다. 테이퍼진 복합재 구조물의 적용분야는 항공기의 날개, 수직/수평 안정판 및 헬리콥터의 로터 블레이드 등이다. (중략)

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Investigation of Impact Behavior by Thickness variation of Laminated Composite Subjected to Low-Velocity Impact (저속충격을 받는 복합적층판의 두께 변화에 따른 충격거동 조사)

  • Kwon, Suk-Jun;Jeon, Jin-Hyung;Kim, Seung-Deog
    • Proceeding of KASS Symposium
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    • pp.74-79
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    • 2008
  • In this study, impact transient responses of (Graphite/Epoxy) laminated composite subjected to low-velocity impact are investigated using a finite element method. Dynamic von-Karman plate equations considering large deflection of plate are modified to include the effect of transverse shear deformations as in Mindlin plate theory and also the rotary inertia effect is considered. The convergence of transient responses is used contact law established through the statical indentation test. We investigate displacements, contact forces and strains by thickness variation of various laminated composite. We compare and analyze each results.

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