• Title/Summary/Keyword: 오토클레이브

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Evaluation of Physical and Mechanical Properties based on Liquid Composite Molding (액상성형공정별 물리적/기계적 특성 비교 평가)

  • Park, Dong-Cheol;Kim, Tai-Gon;Kim, Seung-Hyeok;Shin, Do-Hoon;Kim, Hyeon-Woo;Han, Joong-won
    • Composites Research
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    • v.31 no.6
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    • pp.304-310
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    • 2018
  • Autoclave process has been remaining as one of the most robust and stable process in fabricating structural composite part of aerospace industry. It has lots of advantages, however exhibits some disadvantages or limitations in capital investment and operation. Recently, there have been various Out-of-Autoclave process being researched and developed to overcome those limitations. In this study, laminate specimens were fabricated using LCM (Liquid Composite Molding) process, regarded as one of potential OoA process. DB (Double bagging), CAPRI (Controlled Atmospheric Pressure Resin Infusion), VAP (Vacuum Assisted Process) and Autoclave process were used for laminate specimens. Void content, Thickness, Tg (Glass Transition Temperature), ILSS (Interlaminar Shear Strength) and Flexural strength properties were evaluated for comparison. It is verified that Autoclave based specimen has uniform thickness distribution, the lowest void content and outstanding mechanical properties. And, CAPRI based specimen exhibits relatively good physical and mechanical properties over DB and VAP based specimen and comparable mechanical properties with autoclave based specimen.

Strength Development Properties of Alkali-Activated Slag Mortar by Autoclave Curing (오토클레이브 양생에 의한 알칼리활성슬래그 모르타르의 강도발현 특성)

  • Song, Jin-Gyu;Kim, Byeong-Jo;Oh, Myeong-hyeon
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2015.07a
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    • pp.218-219
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    • 2015
  • Precast concrete produced in the industry is advantage that easy to manage, and it save construction period in the field. The specimens according to the type of activator for AAS(Alkali-Activated Slag) mortar cured in an autoclave. The specimens of AAS mortar with sodium was shown the high rate of increase of the compressive strength.

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Moisture Diffusion Analysis for Bendable Electronic Module Under Autoclave Test Condition (유연성 전자모듈에 대한 오토클레이브 시험조건에서의 습기확산해석)

  • Han, Chang-Woon;Oh, Chul-Min;Hong, Won-Sik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.5
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    • pp.523-528
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    • 2012
  • A bendable electronic module is developed for a mobile application by using a low-cost roll-to-roll manufacturing process. In the module, a thin silicon chip is embedded in a polymer-based encapsulating adhesive between flexible copper clad polyimide layers. A set of tests are conducted for the purpose of qualification: thermal shock, high temperature storage, and autoclave tests. During the autoclave test, delamination occurs at many places within the module layers. To investigate the failure mechanism, moisture diffusion analysis is conducted for the interior of the module under the autoclave test condition. For the analysis, the hygroscopic characteristics of the encapsulating materials are experimentally determined. Analysis results indicate the moisture saturation process in the interior of the module under the autoclave test condition.

A Study on the Analysis of Causes & Minimizing of Defects at Composite Materials Sandwich Aircraft Structure in Autoclave Processing (항공기용 복합재료 샌드위치 구조물의 오토클레이브 성형시 발생되는 결함 원인 분석과 그 최소화 방안)

  • 권순철;임철문;최병근;이세원;한중원;김윤해
    • Composites Research
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    • v.14 no.1
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    • pp.22-29
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    • 2001
  • The purpose of this paper is to determine the effect of the autoclave inner pressure rate, heat-up rate, tool round angle, Thickness of core, height of joggle on defects, and to minimize the defects of aircraft sandwich structure reinforced with honeycomb core occurred in autoclave processing. The results showed that the geometry of aircraft sandwich structure and tool such as tool round angle, thickness of core, height of joggle, and the autoclave cure conditions such as inner pressure rate, heat up rate strongly affected the core movement, core wrinkle, bridge phenomenon of prepreg and depression of core that occurred in autoclave processing.

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Fabrication and Evaluation of Integrated Composite Part for Aircraft using OoA (Out-of-Autoclave) Prepreg (OoA (Out-of-Autoclave) 프리프레그를 이용한 항공기용 복합재 일체형 부품 제작 및 평가)

  • Hong, Sungjin;Song, Min-Hwan;Song, Keunil;Baik, Sang-Moon;Shin, Sang-Jun
    • Composites Research
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    • v.29 no.5
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    • pp.315-320
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    • 2016
  • Conventionally, composite aircraft structures are fabricated within autoclave at high pressure. However, autoclave process has several disadvantages including high curing costs and limitation of part size. Recently, out-of-autoclave (OoA) processes have been investigated in many studies to replace conventional autoclave process. A newly developed OoA prepreg, using conventional ovens, can significantly reduce the curing costs and produce autoclave-quality parts. Nevertheless, manufacture of void-free complex shape structure using OoA process presents significant challenges because of the low consolidation pressure. In this study, integrated skin-spar-rib composite part was fabricated using OoA prepreg. And cross-sectional macro- and micro-graphs of the part were examined in order to assess the possibility of replacing conventional autoclave process.

Stress Analysis for Bendable Electronic Module Under Thermal-Hygroscopic Complex Loads (열·습도 복합하중에서의 유연성 전자모듈에 대한 구조해석)

  • Han, Changwoon;Oh, Chulmin;Hong, Wonsik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.5
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    • pp.619-624
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    • 2013
  • A bendable electronic module is developed. In this module, thin silicon electronic chips are embedded in a polymer-based encapsulating adhesive between flexible copper-clad polyimide layers. During the qualification test of a harshly thermal-hygroscopic complex loading condition, delaminations occur inside the module layers. A finite element model is developed for the module. To investigate the effect of hygroscopic stress on delamination, the results of the thermal and thermal-hygroscopic loads are compared. The analysis results reveal that the hygroscopic effect more strongly affects delamination than does the thermal effect. The potential failure mechanisms of the module are investigated based on the stress analysis.

Preparing of Carbon Fiber Composites Using by Vacuum Bag Hot-press Molding Process and Comparison with the other Molding Processes (진공백 핫 프레스 성형공정을 이용한 탄소섬유 복합재료의 제조와 공정비교)

  • Heo, Won-Wook;Jeon, Gil Woo;An, Seung Kook
    • Composites Research
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    • v.33 no.2
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    • pp.76-80
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    • 2020
  • In this study, vacuum bag hot-press (V-HP) process can be used as an out-of-autoclave (OOA) process by improving the inefficient process of the autoclave forming method with excellent physical properties and surface quality. A carbon fiber composite was molded via V-HP process and analyzed the physical properties and microstructures between composites manufactured by autoclave (AC) process and hot-press process (HP). The tensile strength of the composite materials using the V-HP process was 320.6 MPa and the AC process samples found to be substantially close to the tensile strength of 335.3 MPa. As a result of confirming the surface quality of the composite material using SEM, it was confirmed that in the V-HP process, the removal state of pores due to volatile solvent in the resin was slightly lower than that of the AC process, but it had a considerably superior surface compared to the HP process.

A Study on the Analysis of causes & minimizing of Defects at Composite Materials Sandwich Structure reinforced with Honeycomb core in Autoclave Processing (하니콤 코어로 보강된 복합재료 샌드위치 구조물의 오토클레이브 성형시 발생되는 결함 원인 분석과 그 최소화 방안)

  • 권순철;양철문;최병근;이세원;한중원;김윤해
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2000.11a
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    • pp.21-29
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    • 2000
  • The Purpose of this paper is to determine the effect of the autoclave inner pressure rate, heat-up rate, tool round angle, Thickness of core, height of joggle on defects, and to minimize the defects of aircraft sandwich structure reinforced with honeycomb core occurred in autoclave processing. The results showed that the geometry of aircraft sandwich structure and tool such as tool round angle, Thickness of core, height of joggle, and the autoclave cure conditions such as inner pressure rate, heat up rate strongly affected the core movement, core wrinkle, bridge phenomenon of prepreg and depression of core that occurred in autoclave processing.

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Development of Material Qualification Method for LCM(Liquid Composite Molding) Process (항공기용 액상성형공정(Liquid Composite Molding) 복합재료 인증방안 개발)

  • Sung-In Cho
    • Journal of Aerospace System Engineering
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    • v.17 no.2
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    • pp.71-77
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    • 2023
  • Liquid Composite Molding (LCM), an Out of Autoclave (OoA) composite manufacturing process, has big advantages when making large and complex structures of airplanes. Since the importance of LCM process is increasing, FAA has suggested recommended guidance and criteria for the development of material and process specifications for LCM materials and process. The importance of LCM process is also raised by domestic composite material suppliers and OEM. This study suggested structures of material specifications and process specification of LCM materials. Material qualification method for LCM process and material was also developed in this study.