• Proceedings of the Korean Fiber Society Conference
• /
• 2003.10b
• /
• pp.215-216
• /
• 2003

섬유강화 복합재료(FRC:Fiber Reinforced Composites)는 기존의 금속재료에 비해 높은 비강도, 비강성의 특성으로 인해 자동차, 항공산업 등 폭 넓은 응용 범위에 적용되고 있다. 특히 직물 복합재료(Fibric Composites)는 취급이 용이하고, 유연성이 높기 때문에 복잡한 형상을 가지는 금형에 적용하기가 수월하다. 하지만 아직까지는 금형의 형상에 있어서 제약을 받고 있다. (중략)

• Proceedings of the Korean Fiber Society Conference
• /
• 2003.10b
• /
• pp.251-252
• /
• 2003

오염 입자 물질을 제거하기 위한 섬유상 필터는 polypropylene(이하 PP라 함) film을 fibrillate 하거나 melt blown micro fiber를 이용하여 제조할 수 있다. 특히 melt blown micro fiber web은 마스크 필터, 공기정화용 필터, 수처리용 필터 등에 폭넓게 사용되고 있다 이러한 melt blown micro web은 electret 처리에 의해 그 기능이 더욱 강화되는데, 사용 현장의 oil aerosol 노출되면 정전 특성을 빠르게 잃어버리는 경향이 있다. (중략)

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.29 no.1
• /
• pp.61-65
• /
• 2016

Composites are materials that are widely used in industries such as automobile and aircraft. The composite material is required as a material for using in a high temperature environment as well as acting as a high pressure environment like the nozzle part of the ship. It is important to know the properties of composites. Result values obtained substituting the properties of matrix and fiber numerically have an large error compared with experimental value. In this study we utilize CASADsolver EDISON program for using Finite Element Method. Properties by substituting the fiber and Matrix properties of the composite material properties were compared with those measured in the experiment and calculated by the empirical properties.

• Transactions of the Korean Society of Mechanical Engineers
• /
• v.16 no.12
• /
• pp.2328-2339
• /
• 1992

The propagation of coherent time-harmonic elastic L-and SV-waves is studied in a medium with random distribution of cylindrical inclusions. The purpose of the research is to characterize the dynamic elastic moduli and the attenuation properties of fiber-reinforced composite materials. The cylindes representing the fibers are assumed to be distributed in parallel with each other and the direction of incident waves are normal to the cylinder axes. A multiple scattering formula using the single scattering coefficients in conjunction with the Lax's quasicrystalline approximation is derived from which the dispersion relation for such medium is obtained. In order to formulate the multiple scattering interaction between cylinders, the pair correlation functions are generated by the Monte Carlo simulation technique. From the numerically evaluated complex wavenumbers, the propagation speed of the average wave, the coherent attenuation and the effective elastic moduli are presented as functions of frequency and fiber volume fraction.

• Polymer(Korea)
• /
• v.24 no.6
• /
• pp.860-868
• /
• 2000

In this work, the electro-magnetic interference (EMI) characteristics of PAN-based carbon fibers-reinforced composites are investigated with difference to manufactural parameters, i.e., fiber grade, fiber orientation angle, and laminating method. As a result, EMI shielding effectiveness (SE) of the composites greatly depends on a fiber orientation in composite angle. Especially, the fiber grade affects SE of composites in case of orientation angle of 0$^{\circ}$. Then the SE become greater as the change of electric character according to the arrangement directions, i.e., electrical anisotropy in the same constituent materials. This is due to the skin effect which is represented in the surface of electro-magnetic wave in high-frequency range. In all cases according to lamination methods, the composites represents SE of 83~98% over. Whereas, in symmetric and unsymmetric laminate structures, the SE decreases slightly as the laminate angles of composites increases. On the contrary. the repeating laminates structure shows the opposite tendency. Especially, 90$^{\circ}$ repeating laminate structure shows the SE more than 90% over the measuring frequency.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.13 no.2
• /
• pp.149-158
• /
• 2011

Utilization of the fiber reinforced polymer (FRP) material has been increased as an alternative in a bid to supplement the problems with general construction materials such as long-term problems corrosion, etc. However, there are still many problems in using a linear-shaped FRP material for a tunnel lining structure which has arch-shape in general. In this study, the loading tests for the FRP-concrete composite member was carried out to evaluate their applicability as a tunnel reinforcement material, which are based on the results from preliminary numerical studies for identifying the behavioral characteristics of FRP-concrete composite member. Moreover, numerical analysis under the same condition as applied in the loading tests was again conducted for analysis of mechanical behavior of the composite member. As a result of the load test and numerical analysis, it appears that the FRP-concrete composite member is greatly subject to shear movement caused by bending tension acting on the interface between two constituent members.

• The Monthly Technology and Standards
• /
• s.35
• /
• pp.17-21
• /
• 2004

• The Journal of the Korean dental association
• /
• v.47 no.1
• /
• pp.17-24
• /
• 2009

• 기계와재료
• /
• v.4 no.3 s.13
• /
• pp.23-30
• /
• 1992

• The magazine of the Korean Society for Advanced Composite Structures
• /
• v.3 no.1
• /
• pp.28-32
• /
• 2012