• Title/Summary/Keyword: 강화재

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A Study on the Evaluation of the Failure for Carbody Structures made of Laminated Fiber-Reinforced Composite Materials Using Total Laminate Approach (전체 적층판 접근법을 이용한 섬유강화 적층 복합재 차체 구조물의 파손평가 연구)

  • 신광복;구동회
    • Composites Research
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    • v.17 no.1
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    • pp.18-28
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    • 2004

  • In order to evaluate the strength of carbody structures of railway rolling stock made of laminated fiber-reinforced composite materials, total laminate approach was introduced. Structural analyses were conducted to check the basic design of hybrid composite carbody structures of the Korean Tilting Train eXpress(TTX) with the service speed of 180km/h. The mechanical tests were also conducted to obtain strengths of composite laminates. The results show that all stress components of composite carbody structures are inside of failure envelopes and total laminate approach is recommended to predict the failure of hybrid composite carbody structures at the stage of the basic design.

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Reheating Process of Metal Matrix Composite for Thixoforming (Thixoforming을 위한 금속복합재료의 재가열 공정)

  • 안성수;강충길;조형호
    • Composites Research
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    • v.13 no.4
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    • pp.19-32
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    • 2000

  • The fabrication process of particulate metal matrix composites(PMMCs) with homogeneous distribution of reinforcement and reheating for thixoforming has been studied. Both of eletro-magnetic stirring and mechanical stirring were used to fabricate particulate metal matrix composites(PMMCs) for variation of particle size. The electrical and mechanical processing conditions for fabricating PMMCs are also suggested. For thixoforming of PMMCs, fabricated bi1lets are reheated by using the designed optimal coil with as function of length between PMMC billet and coil surface, and coil diameter and billet. The effect of reinforcement distribution according to variation of billet temperature were investigated with solid fraction theory with a function of matrix alloy and volume fraction of reinforcement.

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Bending Performance of Glulam Beams Reinforced with Carbon Fiber-Reinforced Plastics Bonded with Polyvinyl Acetate-Based Adhesive (초산비닐수지계 접착제를 사용한 탄소섬유강화플라스틱 복합집성재의 휨 성능)

  • Park, Jun-Chul;Shin, Yoon-Jong;Hong, Soon-Il
    • Journal of the Korean Wood Science and Technology
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    • v.37 no.4
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    • pp.364-371
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    • 2009

  • This study was carried out to investigate the bending strength of the Larix glulam beams which were reinforced with CFRP (Carbon fiber reinforced plastic) of which the reinforcement ratios were 0.7% and 2.1% by volume. In the bending test, the rupture shape of the reinforced glulam shows that the reinforced glulam broke firstly in the lowest bottom layer on which tension was loaded, but did not in the upper part reinforced with the CFRP layer. The upper part of the reinforced layer kept strength and did not break when the reinforced glulam broke firstly at the bottom part of the reinforced layer, but broke secondly as loading was increased. In the glulam beams reinforced with CFRP of which the reinforcement ratio was 0.7% by volume, the bending strength of the reinforced beams was increased by 28% at the first break. When beams broke up to the upper part of the reinforced layer, the bending strength of the reinforced beams was increased by 55%, compared to those of control glulam beams. When the glulam beams were reinforced with CFRP of which the reinforcement ratio was 2.1% by volume, the bending strength of the reinforced beams was increased by 77%, compared to those of control glulam beams. The ratio of the height of calculated neutral axis using failure mode recommended by Romani and the height of actual neutral axis using strain gauge was 1.03 and agreed well.

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