• Title/Summary/Keyword: 적층순서

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Optimization of stacking sequence for composite golf club shafts (복합재료 골프샤프트의 적층최적화)

  • Kim, Moo-Sun;Han, Dong-Chul;Kim, Seon-Jin;Lee, Woo-Il
    • Composites Research
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    • v.20 no.1
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    • pp.1-7
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    • 2007
  • This study presents a methodology for optimization of static characteristics of golf club shafts. Stacking sequence for the optimal composite shaft performance is searched. A new objective function is defined for the simultaneous optimization of flexural and torsional stiffnesses. Classical lamination theory is used for the static analysis. As the optimization tool, genetic algorithm is applied with the stacking sequence as design. variables. With the optimal stacking sequence, dynamic characteristics of the shaft is also studied.

Development of the Piecewisely-integrated Composite Bumper Beam Based on the IIHS Crash Analysis (IIHS 충격해석에 근거한 구간 조합 복합재료 범퍼 빔 개발)

  • Jeong, Chan-Hee;Ham, Seok-Wu;Kim, Gyeong-Seok;Cheon, Seong S.
    • Composites Research
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    • v.31 no.1
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    • pp.37-41
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    • 2018
  • The aim of the current work is to characterise a piecewisely-integrated composite bumper beam based on the IIHS bumper crash protocol. IIHS bumper crash FE analysis for an aluminium type bumper beam was carried out to get the information about the dominant loading types at several regions in the bumper beam during crash. In the meantime, robust stacking sequences against tension and compression have been searched for using FE analysis of a coupon type model. After determining most effective stacking sequences for tension and compression, three-point bending simulation was preliminarily carried out to investigate the combination performance of them. Finally, IIHS bumper crash FE analysis for the piecewisely-integrated composite bumper beam, which consisted of the combination of tension effective stacking sequence and compression efficacious stacking sequence, was conducted and the result was compared with other types of composite bumper beams. It was found that the newly suggested piecewisely-integrated composite bumper beam showed superior crashworthy behaviour to those of uni-modal stacking sequence composite bumper beams.

A Comparison of Stacking Sequence Optimization Schemes;Genetic Algorithm and Branch and Bound Method (적층순서 최적화 알고리듬의 평가;유전 알고리듬과 분기법)

  • Kim, Tae-Uk;Shin, Jeong-Woo
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.420-424
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    • 2003
  • Stacking sequence optimization needs discrete programming techniques because ply angles are limited to a fixed set of angles such as $0^{\circ},\;{\pm}45^{\circ},\;90^{\circ}$. Two typical methods are genetic algorithm and branch and bound method. The goal of this paper is to compare the methods in the light of their efficiency and performance in handling the constraints and finding the global optimum. For numerical examples, maximization of buckling load is used as objective and optimization results from each method are compared.

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Sufficient Conditions for Fully Orthotropic Stacking Sequences (완전 직교이방성 적층순서에 대한 충분조건)

  • Lee, Jong-Won;Kim, Jin-Won
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.28-32
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    • 2007
  • Sufficient Conditions are proposed herein for analytically obtaining fully orthotropic (A16=A26=0, Bij=0, D16=D26=0) laminate stacking sequences together with a brief literature survey. A number of specially chosen anti-symmetric balanced stacking sequences are analytically studied, in which all coupling stiffnesses including B16 and B26 are identically zero. Those specially chosen anti-symmetric balanced stacking sequences are then arranged symmetrically with respect to the laminate mid-plane to obtain a number of symmetric stacking balanced stacking sequences of which the elastic stiffnesses are fully orthotropic.

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Nonlinear Analysis of Adhesive Tubular Joints with Composite Adherends subject to Torsion (비틀림 하중을 받는 복합재료 튜브형 접합부의 비선형 해석)

  • Oh Je-Hoon
    • Composites Research
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    • v.19 no.3
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    • pp.29-36
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    • 2006
  • Since composite materials have anisotropic properties that depend on their stacking angle and sequence, the analysis of joints with isotropic adherends is limited in describing the behavior of the adhesive Joint with composite adherends. In this study, the nonlinear solution for adhesive joints with composite adherends was derived by incorporating the nonlinear behavior of the adhesive into the analysis. The behavior of the laminated composite tube was first analyzed, and the stress distributions of the composite tubular adhesive joint were calculated by including the nonlinear properties of the adhesive. The effect of the stacking sequence of composite adherends and bonding length on torque capacities of joints was examined, and results of the nonlinear analysis were also compared with those of the linear analysis.

A Study on the Buckling and Postbuckling Behaviors of Laminated Composite Plates and Stiffened Laminated Composite Panels by Finite Element Method (유한요소법을 이용한 복합적층판과 보강된 복합적층 패널의 좌굴 및 좌굴후 거동에 관한 연구)

  • 허성필;양원호;성기득;조명래
    • 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.

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Buckling Analysis of Laminated Composite Cylindrical Shell under Combined Load State (복합하중상태에 있는 복합재료 원통형 쉘의 좌굴 거동)

  • Yeo, Kyoung-Su;Yang, Won-Ho;Cho, Myoung-Rae;Sung, Ki-Deug
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.9
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    • pp.119-130
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    • 1999
  • This paper deals buckling behavior of laminated composite cylindrical shells subjected to combination of axial compression and torison. Linear and nonlinear finite element analysis are carried out . the influence of load type, load ratio, fiber orientation angle, stacking sequence, and intial imperfect on buckling behavior is discussed.

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원공노치를 가진 CFRP의 적층방향에 따른 기계적 특성 평가

  • 태영일;윤유성;권오헌
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2001.11a
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    • pp.349.2-363
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    • 2001
  • 안전성의 측면에서 기계설비 및 구조물의 파손을 유발할 수 있는 재료손상에 대한 평가는 매우 중요하기 때문에, 사용 목적에 부합되는 우수한 첨단재료의 개발과 그 특성을 파악할 필요성이 있다 그 중에서 섬유강화 복합재료는 금속재료보다 높은 비강도와 비강성을 가지며 적층각도, 적층순서 및 경화방법에 따라서 원하는 강도와 강성을 가질 수 있다 특히, 탄소섬유강화복합재료(CFRP)는 스포츠용품에서 최신 항공기의 구조재료에 이르기까지 경량화 관점에서 기존의 재료를 대체해 나가고 있다.(중략)

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복합재료 적층구조의 역학적 특성

  • 홍창선
    • Journal of the KSME
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    • v.32 no.1
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    • pp.4-17
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    • 1992
  • 이 글에서는 복합적층판의 역학적 특성인 층간분리, 모재균열, 초기파손 후의 거동에 대한 문헌을 간단히 서술하고 그 특성을 살펴 보았다. 이상에서 살펴본 바와 같이 이방성인 층으로 구성된 복합적층 구조의 역학적 특성은 균질인 단일구조와 달리 각층의 재료상수가 달라층과 층 사이의 층간응력이 존재하여 층간분리현상이 발생하지 않도록 섬유방향뿐만 아니라 적층순서를 중요한 설계변수로 고려하여야 한다. 또한 모재균열로 인한 기계적 거동의 변화를 이해하고 초기파손 후의 손상을 고려한 해석을 수행하여 복합적층 구조의 응력해석 및 파손, 강도예측을 한다.

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