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카본블랙을 이용한 하이브리드 복합재료의 전자파 차폐 효과
한길영 ( Gil Young Han ),김기열 ( Ki Yeol Kim ) 조선대학교 공학기술연구원 2015 공학기술논문지 Vol.8 No.4
This study investigates electromagnetic interference (EMI) shielding effectiveness (SE) of hybrid composite materials. We designed and constructed a measuring system including a network analyzer and a device that serves as a sample holder and at the same time as a transmission medium of incident electromagnetic waves. The measurements of SE were carried out in a frequency range from 100 MHz to 2 GHz. The results of the EMI shielding experiments showed that the electromagnetic wave shielding effectiveness could be improved when carbon fiber sheet and the shield wear are produced in the sandwich type of hybrid composite materials with the carbon black. The CF/CCo/CF composite materials using carbon black was shown to exhibit up to 83dB of SE at 700 MHz.
하이브리드 전도성 Filler 섬유강화 복합재료의 전자파 차폐효과
한길영(Gil-Young Han),송동한(Dong-Han Song),배지수(Ji-Soo Bae) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.3
The main objective of this study was to investigate fiber reinforced composite materials (FRCM) with electromagnetic shielding characteristics using aluminum (Al) film and copper (Cu) meshes. This study investigated the electromagnetic interference (EMI) shielding effectiveness (SE) of fiber reinforced composites filled with Al film, Cu meshes, and nano carbon black as hybrid conductive fillers to provide the electromagnetic shielding property of the fiber reinforced composites. The coaxial transmission line method of ASTM D 4935-89 was used to measure the EMI shielding effectiveness of composites in the frequency range of 300 ㎒ to 1.5 ㎓. The variations of SE of FRCM with Al film fine Cu, and general Cu meshes are described. The results indicate that the FRCM having Al film exhibited up to 75 ㏈ of SE at 1.5 ㎓.
한길영(GIL-YOUNG HAN),안동규(DONG-GUE AHN),이동기(DONG-GI LEE) 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.1
The objective of this research is to investigate the mechanical characteristics of the hybrid fiber reinforced composite rebar, which is manufactured from a braidtrusion process. Braidtrusion is a direct composite fabrication technique, utilizing in-line brading and the pultrusion process. In order to obtain the mechanical behavior of the glass fiber, carbon fiber, and kevlar fiber, the tensile tests are carried out. The results of the fibers are compared with that of steel. Hybrid rebar specimens with various diameters, ranging from model size (3 ㎜) to full-scale size (9.5 ㎜), and various cross sections, such as solid and hollow shape, have been manufactured from the braidtrusion process. The tensile and bending tests for the case of the hybrid rebar, the conventional GFRP rebar, and the steel bar have been carried out. The results of the experiments show that the hybrid rebar is superior to the conventional GFRP rebar and the steel bar, from the viewpoint of tensile and bending characteristics.
자동차 사이드 도어용 인트루젼 비임 개발을 위한 케블라섬유강화 복합재료의 기계적 특성에 관한 연구
한길영(GIL YOUNG HAN),이동기(DONG GI LEE) 한국해양공학회 2000 韓國海洋工學會誌 Vol.14 No.2
Using conventional textile techniques such as weaving, braiding, knitting and stitching it is possible to produce a wide range two and three dimensional fiber preforms. However, so far only a limited attention has been given to knitted fabrics in composite industry. This is mainly due to the opinion that knitted fabric reinforced composites posses low mechanical properties owing to their looped fiber architecture. But it is possible to obtain desired mechanical properties by selecting proper knitted fabric structure. In this paper, mechanical characteristics of kevlar plain weft knitted fabrics reinforced plastics (KFRP) are evaluated for the development of intrusion beam of car side door. Tensile, bending, impact properties of KFRP are measured experimentally and crush demands of American Federal Motor Vehicle Safety Standard No.214(FMVSS 214) compared with the bending load and displacement of KFRP by quasi-static test method. The applicability and limitation of bending load and displacement of KFRP according to specimen size has been discussed.
ABS/Nickel 코팅 탄소섬유와 Epoxy/Copper-Nickel 직조 섬유 복합재료의 전자파차폐 효과
한길영(Gil-Young Han),정우철(Woo-Chul Jung),양인영(In-Young Yang),선향선(Hyang-Sun Sun) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.6
Electromagnetic interference(EMI) shielding effectiveness(SE) was investigated in of woven fabric made of epoxy/copper-nickel fabrics and nickel coated carbon fiber reinforced acrylonitrile-butadiene-styrene(ABS) composites. The coaxial transmission line method was used to measure the EMI shielding effectiveness of the composites. We designed and constructed a measuring system, consisting of a network analyzer and a device that plays the serves as a sample holder and at the same time as a transmission medium of the incident electromagnetic wave. The measurement of SE were carried out frequency range from 100MHz to 2GHz. It is observed that the SE of the composits is the frequency dependent increase with the increase in nickel coated carbon fibre volume fraction. The nickel coating with 20wt% ABS composite was shown to exhibit up to 60dB of SE. The result that nickel coated carbon fibre ABS composite can be used for the purpose of EMI shielding as well as for some microwave applications.
알루미늄 필름, 전도성 직조섬유/나노 카본블랙 탄소섬유복합재료의 전자파 차폐효과에 관한 연구
한길영(Gil-Young Han),송동한(Dong-Han Song),배지수(Ji-Soo Bae),안동규(Dong-Gyu Ahn) 한국기계가공학회 2008 한국기계가공학회지 Vol.7 No.4
This study investigated electromagnetic interference(EMI) shielding effectiveness(SE) of the aluminum film, conductive fabric and nano carbon black carbon fiber reinforced composites. We fabricated carbon fiber reinforced composites filled with nano carbon black where they bonded aluminum film and conductive fabric. The measurements of SE were carried out frequency range from 300MHz to 1.5GHz. It is observed that the SE of the bonded aluminum film and conductive fabric composites is the frequency dependent, increase with the increase in filler nano carbon black content. The aluminum film bonded composites showed higher SE compared to that of carbon black and conductive fabric. The aluminum film bonded epoxy composite was shown to exhibit up to 80dB of SE. The result that aluminum film bonded composite can be used for the purpose of EMI shielding as well as for some microwave applications.
은 피복 나일론 섬유와 면섬유 하이브리드 복합재료의 전자파 차폐효과
한길영 ( Gil-young Han ),김기열 ( Ki-yeol Kim ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.2
In this paper, the shielding effectiveness (SE) of electromagnetic interference (EMI) was investigated for hybrid composites with Ag-coated nylon fiber and cotton fiber. We designed and constructed a measuring system, consisting of a network analyzer and a device that serves as a sample holder and at the same time as a transmission medium of incident electromagnetic waves. The results of the EMI shielding experiments showed that the electromagnetic shielding effectiveness (EMSE) values of sandwich type N/C/N and C/N/C specimens were about 70 % higher than N specimens in frequency range of 100 MHz to 2 GHz. The maximum shielding effectiveness value of Co specimen was 42dB at 1.8 GHz, Co/C/Co specimen 60dB at 1.5 GHz and C/Co/C specimen 71dB at 600 MHz, respectively. This is to be considered due to lamination of cotton fiber specimen and the dependence on the electromagnetic wave shielding at the frequency band according to materials.
방한서(Han-Sur Bang),한길영(Gil-Young Han) 한국해양공학회 1994 韓國海洋工學會誌 Vol.8 No.1
Welding of structure produces welding residual stresses which influence buckling strength, brittle fracture strength and cold crack on the weld parts. Therefore, it is very important to accurately analyze the residual stress before welding in order to guarantee the safety of weldment.<br/> If the weld length is long enough compared to the thickness and the breadth of plate, thermal and mechanical behaviors in the middle portion of the plate are assumed to be uniform along the thickness direction(z-axis). Thus, the following conditions(so-called plane deformation) can be assumed for the plate except near its end ; 1) distributions of stress and strain are independent on the z-axis ; 2) plane normal to z-axis before deformation remains plane during and after deformation.<br/> In this paper, plane-deformation thermal elasto-plastic problem is formulated by being based on the finite element method. Moreover special regards are paid to the fact that material properties in elastic and plastic region are temperature-dependence. And the method to solve the plane-deformation thermal elasto-plastic problem is shown by using the incremental technique. From the results of analysis, the characterisics of distribution of welding residual stress and plastic strain with the production mechanism are clarified.