• Title/Summary/Keyword: Composite material certification

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Advanced Methodology of Composite Materials Qualification for Small Aircraft (소형항공기용 복합재료 인증시험)

  • Lee, Ho-Sung;Min, Kyung-Ju
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.35 no.5
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    • pp.446-451
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    • 2007
  • Since the introduction of advanced composite materials for use in aircraft, the material qualification has been a costly burden to the small airframe manufacturer. For each manufacturer, extensive qualification testing has often been performed to develop the base material properties and allowables at operating environmental conditions, regardless of whether this material system had been previously certificated by other manufacturers. In recent years, NASA, industry, and the FAA have worked together to develop a cost-effective method of qualifying composite material systems by the sharing of a central material qualification database. In this paper, the new methodology of composite material qualification is presented and material allowable of 350°F carbon fiber/epoxy composite material produced domestically is determined with this methodology.

Development of Structural CFRP according to BMS Certification Standard (BMS 인증기준에 따른 구조용 CFRP 개발)

  • Kang, Byong-Yun;Son, Chang-Suk;Moon, Chang-Kwon;Nam, Ki-Woo;Kim, Yoon-Hae
    • Journal of Ocean Engineering and Technology
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    • v.23 no.2
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    • pp.92-97
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    • 2009
  • In order to export aircraft components or substructures, it is necessary to get a certification from the main company for the components or an airworthiness certification from the FAA. In Korea, those processes are performed by a small number of private companies for aircraft components. However, airworthiness certification has never been done in the company. To export an assembled aircraft, whether small or large, it is obligatory to get a certification for the aircraft being exported. Currently, the Korean government is trying to get BASA agreement in a few years. For a mid-size company, it is easier to get the NADCAP audit process for the supply of aircraft components to the main company. In this paper, the overall process of aircraft certification is discussed and airworthiness certification is treated for export aircraft. Moreover, the NADCAP audit process is described in detail by introducing example parts made of composite material. This detailed process would be very helpful to a small or mid-size company that wants to develop and deliver aircraft components to foreign companies.

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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    • v.28 no.6
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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.

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

  • Bae, Sung-Hwan;Cho, Sung-In;Choi, Cheong-Ho;Jeon, Seungmok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.48 no.12
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    • pp.969-976
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    • 2020
  • Urban Air Mobility is attracting attention as a future innovation industry around the world, and leading industries are considering the application of composite materials for structural robustness and lightening in the designing and manufacturing new concept eVTOL aircraft. To apply composite materials to the new concept of eVTO aircraft, this paper was analyzed about composite material qualification system of FAA & EASA and institutionalized by Korea Government, including the procedures and methods, the organization to carry out the material verification for domestic conditions. The domestic composite material qualification system will not only make it easier for manufacturers of eVTOL aircraft with a new concept to apply composite materials to domestic aircraft through pre-material qualification, but also reduce the burden of material qualification within the period of type certification. In addition, domestic manufacturers of composite materials with qualified material quality and performance will be easy to enter for domestic aircraft applications and composite material manufacturers with experience in applying to aircraft will have a positive impact on overseas exports. This system will be able to promote the development eVTOL aircraft industry of a new concept and enhance international credibility of made aircraft in Korea.

Development of Composite Brake Pedal for KTX-1 and Tests for Structural Certification (KTX-1 복합재 브레이크 페달 개발 및 구조 인증시험)

  • Joe, Chee-Ryong;Kim, Hyun-Su;Kim, Kwang-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.23 no.7 s.166
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    • pp.1104-1111
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    • 1999
  • A brake pedal for the flight control system of the Korean primary trainer is developed using composite material. The development includes the structural design, stress analysis, manufacturing and the qualification tests. A FEM analysis is used for the structural design and stress analysis. Autoclaving process is used to fabricate the composite brake pedal. For the qualification tests, modular fixtures are developed and applied. It is shown that the composite brake pedal developed meets all the structural integrity requirements specified in the military specification for aircraft parts.

Design and Analysis on Composite Structure for Aircraft Certification (항공기 인증을 위한 복합재 구조물 설계/해석)

  • Kim, Sung-Joon;Choi, Ik-Hyeon;Ahn, Seok-Min;Yeom, Chan-Hong
    • Aerospace Engineering and Technology
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    • v.8 no.1
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    • pp.42-48
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    • 2009
  • There are a number of factors affecting the continued airworthiness of composite structure. Unlike metal structure, damages made in manufacturing processes or maintenance repair procedures need to be considered. The different levels of degradation and damage, which may occur, must be considered for structural substantiation of static strength, stiffness, flutter, and damage tolerance. This can start with an evaluation of environmental effects for the particular composite material. Matrix-dominated composite properties, such as compressive strength, are most sensitive to moisture absorption and temperatures. Static strength substantiation includes the smaller damages that will not be detected in production or maintenance inspection while damage tolerance addresses larger damages that need to be repaired once discovered. In this paper, we intend to list the airworthiness regulations and advisory circular that are deemed closely related to the certification of composite airplanes.

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Comparative Study of Mechanical and VOC Properties According to Manufacturing Conditions of Glass Fiber/Bamboo Fiber/PP Composites (유리섬유/대나무섬유/PP 복합재의 제조 조건에 따른 기계적 및 VOC 특성 비교 연구)

  • Lee, Su-kyoung;Park, Tae-sung;An, Seung-kook
    • Textile Coloration and Finishing
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    • v.33 no.3
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    • pp.153-160
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    • 2021
  • In this study, composite materials were prepared by varying the content of glass fiber and bamboo fiber in PP/glass fiber/bamboo fiber. Experiments were conducted to confirm the mechanical properties(tensile, impact and burst strength) and volatile organic compound content of the bamboo fiber composite prepared under these conditions. An improvement in the main properties was observed at a fiber content of 30wt%. When the fiber fraction was increased above 30wt%, the mechanical properties tended to decrease due to the agglomeration of fibers at higher load fractions. In addition, the content of volatile organic compounds increased as the content of bamboo fibers increased, which is thought to be due to the volatile organic compounds generated during the manufacturing process of the composite material being present in the composite material without escaping from the pores of the bamboo fibers and volatilizing at a certain temperature. As a result of confirming the physical properties of the composite, it is considered that the optimal mixing condition is 30wt% of bamboo fiber for the composite produced by varying the amount of bamboo fiber composite. In the future, it is thought that follow-up experiments to confirm and improve the pre-treatment conditions for reducing the content of volatile organic compounds in the manufactured composite material are possible.

Comparative Study on Mechanical Properties of Sonicated Bamboo and Kenaf Fiber Composite (초음파 처리된 대나무섬유와 케냐프섬유 복합재의 기계적 특성 비교 연구)

  • Lee, Su Kyoung;Park, Eun Young;Park, Tae Sung;An, Seung Kook
    • Textile Coloration and Finishing
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    • v.32 no.4
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    • pp.274-280
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    • 2020
  • This study compared the mechanical properties of bamboo fiber composites and kenaf fiber composites through physical treatment (ultrasonic treatment). Kenaf, a composite of PP reinforced with bamboo fiber, was made using injection molding technology. PP was used as a binder and the ultrasonic treatment time of bamboo and kenaf was increased by 30 minutes to compare and study various mechanical properties of bamboo and kenaf composites through physical treatment. Interfacial properties such as internal cracks and internal structure of the wave cross section were confirmed using a scanning electron microscope (SEM). As a result of the ultrasonic treatment, most of the characteristics were fragile as the ultrasonic treatment time was increased, and it was confirmed that the natural characteristics of the twisted fibers had a great influence on the characteristics of the composite material.

Compliance Validation Method of UAM Composite Part Manufacturing System based on Composite Material Qualification System (복합재료인증체계를 통한 UAM 용 복합재료 부분품 인증 적합성 확인 방안)

  • Cho, Sung-In;Yang, Yong Man;Jung, Seok-Ho;Kim, Je-Jun
    • Journal of Aerospace System Engineering
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    • v.16 no.3
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    • pp.35-41
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    • 2022
  • UAM (Urban Air Mobility) is a new safe, secure, and more sustainable air transportation system for passengers and cargo in urban environments. Commercial operations of UAM are expected to start in 2025. Since production rates of UAM are expected to be closer to cars than conventional aircraft, the airworthiness methodology for UAM must be prepared for mass production. Composite materials are expected to be mainly used for UAM structures to reduce weight. In this paper, the composite material qualification method was derived and the materials were applied for small aircraft application. It is expected to reduce the airworthiness certification time by applying composite material qualification system and its database.

Impact force and acoustic analysis on composite plates with in-plane loading (면내하중을 받는 복합적층판에 대한 충격하중 및 음향 해석)

  • Kim, Sung-Joon;Park, Ill-Kyung;Ahn, Seok-Min
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2011.10a
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    • pp.244-249
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    • 2011
  • The potential hazards resulting from a low-velocity impact (bird-strike, tool drop, runway debris, etc.) on aircraft structures, such as engine nacelle or a leading edges, has been a long-term concern to the aircraft industry. Certification authorities require that exposed aircraft components must be tested to prove their capability to withstand low-velocity impact without suffering critical damage. In most of the past research studies unloaded specimens have been used for impact tests, however, in reality it is much more likely that a composite structure is exposed to a certain stress state when it is being impacted, which can have a significant effect on the impact performance. And the radiated impact sound induced by impact is analyzed for the damage detection evaluation. In this study, an investigation was undertaken to evaluate the effect in-plane loading on the impact force and sound of composite laminates numerically.

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