• 제목/요약/키워드: composite aircraft

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항공기용 복합소재 인증 고찰 (An Overview of Composite Material Qualification for Aircraft)

  • 양용만;윤범수;전승목;이승근;백운율;오만석
    • Composites Research
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    • 제36권5호
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    • pp.361-368
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    • 2023
  • 항공기에 사용되는 복합소재는 항공기의 감항성 확보를 위하여 인증된 소재를 사용해야 하며 소재의 물리적 특성 및 공정을 확인하여 재료규격 및 공정규격서등의 인증 문서와 시스템을 승인하는 방식으로 인증이 진행된다. 국내 복합소재 인증시스템은 국토교통부의 항공기용 복합재료 시범인증 사업을 통해 마련되었으며 현재 항공기 전문검사기관인 항공안전기술원에서 인증 및 공유 데이터시스템을 구축하여 운영하고 있다. 본 논문은 실증을 바탕으로 구축된 항공기용 복합소재 인증체계의 개선사항을 식별하고 이에 대한 개선 방안 도출을 통해 국산 항공기용 복합소재의 인증 및 산업 활성화 방안을 제시하였다.

복합재 항공기 전기체 구조시험 시험하중 산출 방법 연구 (A Study on Calculation of Test Load for Full-Scale Airframe Structural Test of Composite Aircraft)

  • 최익현;안석민
    • 항공우주기술
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    • 제10권2호
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    • pp.146-153
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    • 2011
  • 복합재 항공기의 설계하중 데이터로부터 전기체 구조시험 중에 하중부가용 스트랩에 부가될 시험하중의 크기를 산출하는 몇 가지 방법에 대하여 비교 분석하였다. 이 방법들을 KC-100 복합재 항공기 좌측 주익의 시험하중 산출과정에 적용해보고 산출된 결과의 특성 및 차이를 분석하였다. 항공기 전기체 구조시험에 부가되는 시험하중은 각 항공기의 설계 하중의 특성 및 하중부가용 스트랩의 위치 등에 따라 그 크기가 다르게 결정되므로 본 연구에서 소개하는 시험하중 산출방법을 모두 적용하여 결과를 비교해보고 최종적으로 적합한 방법을 선정하는 과정이 필요하다.

Recent Development in Ultrasonic Guided Waves for Aircraft and Composite Materials

  • Rose, Joseph L.
    • 비파괴검사학회지
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    • 제29권6호
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    • pp.525-533
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    • 2009
  • Emphasis in the paper is placed on describing guided wave successes and challenges for applications in aircraft and composite materials inspection. Guided wave imaging methods discussed includes line of sight, tomography, guided wave C-scan, phased array, and ultrasonic vibration methods. Applications outlined encircles lap splice, bonded repair patch, fuselage corrosion, water loaded structures, delamination, and ice detection and de-icing of various structures.

전기동력 수직이착륙 항공기의 복합재료 적용을 위한 소재인증 방안 고찰 (A Study on the Certification Method for the Application of Composite Material of eVTOL Aircraft)

  • 배성환;조성인;최청호;전승목
    • 한국항공우주학회지
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    • 제48권12호
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    • pp.969-976
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    • 2020
  • 전 세계적으로 도심항공교통이 미래 혁신산업으로 주목받고 있으며 국내/외 유수의 산업체들은 신개념의 전기동력 수직이착륙 항공기 설계 및 제작에 구조적 강건성과 경량화를 위해 복합재료의 적용을 고려하고 있다. 본 논문에서는 신개념의 전기동력 수직이착륙 항공기에 복합재료를 적용하기 위하여 항공선진국의 복합재료 인증체계 및 국내 실정에 적합한 항공용 복합재료 인증 절차 및 방법, 재료 입증을 수행할 조직구성 등 항공안전기본계획에 의해 제도화된 복합재료 인증체계에 대해 분석하였다. 국내에서 수립된 항공용 복합재료 인증체계에 의해 신개념의 전기동력 수직이착륙 항공기 제작사는 사전 소재인증을 통해 국산 항공기에 복합재료를 적용하는 것이 용이해졌을 뿐만 아니라 형식증명 기간 내에 소재 입증에 대한 부담이 감소할 것이다. 또한, 재료 품질 및 성능이 입증된 국산 복합재료의 제작사는 국산 항공기 적용을 위한 진입이 수월할 것이며 항공기에 적용한 경험이 있는 재료 제작사는 해외 수출에도 긍정적인 영향을 미칠 것이다. 이를 통해 신개념의 전기동력 수직이착륙 항공기 산업발전을 도모하고 국내에서 제작된 기체의 국제적 신인도 제고를 기대할 수 있을 것이다.

Optimization of Composite Laminates Subjected to High Velocity Impact Using a Genetic Algorithm

  • Nguyen, Khanh-Hung;Ahn, Jeoung-Hee;Kweon, Jin-Hwe;Choi, Jin-Ho
    • International Journal of Aeronautical and Space Sciences
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    • 제11권3호
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    • pp.227-233
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    • 2010
  • In this study, a genetic algorithm was utilized to optimize the stacking sequence of a composite plate subjected to a high velocity impact. The aim is to minimize the maximum backplane displacement of the plate. In the finite element model, we idealized the impactor using solid elements and modeled the composite plate by shell elements to reduce the analysis time. Various tests were carried out to investigate the effect of parameters in the genetic algorithm such as the type of variables, population size, number of discrete variables, and mutation probability.

항공기 복합재 날개구조 전단흐름 해석 (Shear Flow Analysis of Aircraft Composite Wing Structure)

  • 최익현;김성찬;김성준
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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    • pp.75-78
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    • 2004
  • Traditionally aluminum alloy have been used in manufacturing of aircraft structures, and semi-monocoque structural concept have been mainly applied in structural design of fuselage and wing. However, recently monocoque structural concept is applied in many small-size aircraft structures manufactured with composite materials. In such case appling monocoque structural concept, in initial conceptual design stage on wing, it is not easy to analyze shear flow using classical shear flow analytical method because composite skin structure can support span-wise tension/compression stress as well as sectional shear stress. In this study, an extended shear-flow analytical method to apply to composite monocoque structural concept was developed through extending the classical shear-flow analytical method.

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Establishment of Aerospace Composite Materials Data Center for Qualification

  • Lee, Ho-Sung;Rhee, Seung Yun;Yoon, Jong-Hoon;Yoo, Joon-Tae;Min, Kyung Ju
    • Composites Research
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    • 제28권6호
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    • pp.402-407
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    • 2015
  • It is well known that the polymer matrix composite materials have good specific strength, making them appropriate for use in transport vehicle. Since the property of composite materials can be obtained only after manufacturing parts, the property depends on greatly on the fabrication process, which is different from metallic system. Therefore, in order to use composite materials for aircraft, the certifying agency requires a robust database with extensive tests and proof of the process unlike metals. Recently developed material qualification methodology by NCAMP (National Center for Advanced Materials Performance) has been accepted by FAA and EASA and can be applied to type certificate reducing time and cost of developing a composite materials database for aircraft application. This paper summarizes a study to establish the composite materials database to apply the NCAMP methodology to composite materials characterization for composite aircraft and to provide the effective materials database through Aerospace Composite Materials Data Center to be approved by Korea Civil Aviation Certification Agency.

항공기 기체에 적용된 샌드위치 복합재 구조의 손상 후 수리 방안 연구 (A Study on Repair Technique after Damage of Aircraft Sandwich Composite Structure)

  • 박현범;공창덕
    • 항공우주시스템공학회지
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    • 제7권1호
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    • pp.39-43
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    • 2013
  • In this study, damage assesment and repair technique of aircraft adopted on Sandwich composite structure were performed. The sandwich composite structure were damaged by drop weight type impact test machine. The damaged sandwich composite structure was repaired using external patch repair method after removing damaged area. This study presents comparison results of the experimental investigation between the impact damaged and the repaired specimen.

A Numerical Study of the High-Velocity Impact Response of a Composite Laminate Using LS-DYNA

  • Ahn, Jeoung-Hee;Nguyen, Khanh-Hung;Park, Yong-Bin;Kweon, Jin-Hwe;Choi, Jin-Ho
    • International Journal of Aeronautical and Space Sciences
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    • 제11권3호
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    • pp.221-226
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    • 2010
  • The failure of a Kevlar29/Phenolic composite plate under high-velocity impact from an fragment simulation projectile was investigated using the nonlinear explicit finite element code, LS-DYNA. The composite laminate and the impactor were idealized by solid elements, and the interface between the laminas was modeled as a tiebreak type in LS-DYNA. The interaction between the impactor and laminate was simulated using a surface-to-surface eroding contact algorithm. When the stress level meets the given failure criteria, the layer in the element is eroded. Numerical results were verified through existing test results and showed good agreement.

Analysis of the adhesive damage between composite and metallic adherends: Application to the repair of aircraft structures

  • Ibrahim, Nour Chafak;Bouanani, Morad Fari;Bouiadjra, Bel Abbes Bachir;Serier, Boualem
    • Advances in materials Research
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    • 제5권1호
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    • pp.11-20
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    • 2016
  • In bonded composite repair of aircraft structures, the damage of the adhesive can thus reduce significantly the efficiency and the durability of the bonded composite repair. The adhesive damage models using critical zone have proven their effectiveness due to simplicity and ap-plicability of the damage criteria in these models. The scope of this study is to analyze the effects of the patch thickness and the adhesive thickness on the damage damage in bonded composite repair of aircraft structures by using modified damage zone theory. The obtained results show that, when the thickness of adhesive increases the damage zone increases and the adhesive loses its rigidity, inversely when the patch is reduced the adhesive damage be-comes more significant.