• 제목/요약/키워드: Composite Materials

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브레이드 복합재료를 이용한 피뢰기 모듈 제조에 관한 연구 (Manufacture of arrester module using braided composite materials)

  • 한동희;조한구;한세원;박기호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 C
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    • pp.1467-1469
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    • 2002
  • This paper aims to investigate the characteristics of braided thermoplastic and thermosetting composite and pressure relief for polymer arrester. In general, braided composite has potential for improved impact and delamination resistance. Manufacturing processes of the braided composite could also be automated and could potentially lead to lower costs. Therefore, in consideration of characteristics of pressure relief for polymer arrester, the fabric pattern of braided composite was studied. And polymer arrester module was manufactured with braid.

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대칭 및 반 대칭으로 적층된 복합재료 채널 빔의 굽힘 거동 (Bending Behaviors of CAS and CUS Thick-walled Composite Channel Beam)

  • 박미정;전흥재;변준형
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2005년도 춘계학술발표대회 논문집
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    • pp.167-171
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    • 2005
  • The thick open section composite beams are used extensively as load carrying members and stiffeners of structural elements. However, most of studies on thick composite beams are limited only to closed section beams. In this study, an open cross-section thick-walled composite beam model which includes coupled stiffness, transverse shear, and warping effects is suggested and the deflections associated with the thick-walled composite beams and thin-walled composite beams are obtained and compared with the finite element analysis results. The correlation between thin and thick walled composite beam was achieved for two different layup configurations which are the circumferentially asymmetric stiffness (CAS) and circumferentially uniform stiffness (CUS) beams.

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Properties of Graded Open-celled Metal Foams

  • Adler, J.;Kummel, K.;Quadbeck, P.;Standke, G.;Stephani, G.
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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    • pp.601-601
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    • 2006
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Synthesis and Properties of Open-celled Metal Foams

  • Adler, J.;Kummel, K.;Quadbeck, P.;Standke, G.;Stephani, G.
    • 한국분말야금학회:학술대회논문집
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    • 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part 1
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    • pp.103-103
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    • 2006
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복합 티타늄실리사이드 공정에서 발생한 공극 생성 연구 (Void Defects in Composite Titanium Disilicide Process)

  • 정성희;송오성
    • 한국재료학회지
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    • 제12권11호
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    • pp.883-888
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    • 2002
  • We investigated the void formation in composite-titanium silicide($TiSi_2$) process. We varied the process conditions of polycrystalline/amorphous silicon substrate, composite $TiSi_2$ deposition temperature, and silicidation annealing temperature. We report that the main reason for void formation is the mass transport flux discrepancy of amorphous silicon substrate and titanium in composite layer. Sheet resistance in composite $TiSi_2$ without patterns is mainly affected by silicidation rapid thermal annealing (RTA) temperature. In addition, sheet resistance does not depend on the void defect density. Sheet resistance with sub-0.5 $\mu\textrm{m}$ patterns increase abnormally above $850^{\circ}C$ due to agglomeration. Our results imply that $sub-750^{\circ}C$ annealing is appropriate for sub 0.5 $\mu\textrm{m}$ composite X$sub-750_2$ process.

탄소섬유 복합재료의 열사이클에 의한 물성치 변화에 관한 연구 (A study for multi thermal cycle effect on mechanical property change in carbon epoxy composite)

  • 최순권;박세만;박명균
    • 한국복합재료학회:학술대회논문집
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    • 한국복합재료학회 2000년도 춘계학술발표대회 논문집
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    • pp.43-48
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    • 2000
  • Composite materials have been increasingly used in automotive and aircraft industries, naturally leading to active researches on the materials. The carbon-epoxy composite is selected to study its thermal characteristics. During multiple thermal cycles composed of repeated cooling and heating variations of elastic constants are investigated to understand thermal effects on the carbon-epoxy composite. In this investigation longitudinal resonance method and flexural resonance method was used to characterize. The values of $E_1$ show small amount of increases depending on number of cycles of the thermal fatigue processes whereas values of $G_13$ do not indicate noticeable changes. Also, in cases of $E_2$ and $G_23$ their values decrease to a certain extend in initial stages after applications of thermal fatigue processes. However, the number of cycles of the applied thermal fatigue processes does not seem to affect their values.

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ARB법에 의해 강소성가공된 Al/SiCp 입자분산복합재료의 미세조직 및 기계적 특성 (Microstructure and Mechanical Properties of Al/SiCp Particle Reinforced Composite Severely Deformed by ARB Process)

  • 이성희;김형욱
    • 한국분말재료학회지
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    • 제13권1호
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    • pp.39-45
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    • 2006
  • The $Al/SiC_p$ particle reinforced composite fabricated by a powder-in sheath rolling (PSR) method was severely. deformed by the accumulative roll-bonding (ARB) process. The ARB process was performed up to 8 cycles at ambient temperature without lubricant. The ARBed composite exhibited an ulbricant. grained structure similar to the other ARBed bulky materials. Tensile strength of the composite increased gradually with the number of ARB cycles, but from the 6th cycle it rather decreased slightly. These characteristics of the composite were somewhat different from those of Al powder compact fabricated by the same procedures. The difference in microstructure and mechanical properties between Al powder compact and the composite was discussed.

ANSYS를 이용한 복합 적층 사각판의 진동특성에 관한 연구 (A Study on the Vibration Characteristics of Laminated Composite Rectangular Plate using ANSYS)

  • 이기형
    • 한국안전학회지
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    • 제12권2호
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    • pp.37-44
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    • 1997
  • Composite materials have various complicated characteristics depending on the ply materials, ply orientations, ply stacking sequences and boundary conditions. Therefore, it is difficult to analyze composite materials. For efficient use of composite materials in engineering applications, the dynamic behavior such as natural frequencies and nodal patterns should be identified. This study presents FEM results for the free vibration of symmetrically and antisymmetrically laminated composite and hybrid composite rectangular plates. The natural frequencies of laminated composite rectangular plates having the various boundary conditions (completely clamped, 2-edge clamped, cantilevered) are experimentally obtained. In order to demonstrate the validity of the experiment, FEM analysis using ANSYS was performed and natural frequencies experimentally obtained is compared with that calculated by FEM analysis. The results obtained from both experiment and FEM analysis show a good agreement.

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