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한길영,이동기,김성용 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.2
This paper describes the need for a ductile Fiber Reinforced Plastic(FRP) reinforcement for concrete structures. Using the material hybrid and geometric hybrid, it is demonstrated that the pseudo-ductility characteristic can be generated in FRP rebar. Ductile hybrid FRP bars were successfully fabricated at 4mm and 10mm nominal diameters using an hand lay up method. Tensile specimens from these bars were tested and compared with behavior of FRP rebar and steel bar. The summarized results are as follows : The tensile strength of CFRP, KFRP and GFRP rebar with nominal diameter ψ4mm, respectively, showed 91.7kg/mm^2, 66.5kg/mm^2, 53.6kg/mm^2. The tensile strength of CFRP, KFRP, GFRP rebar with nominal diameter ψ10mm by the hand lay up method, respectively, showed 125.4kg/mm^2, 54.1kg/mm^2, 46kg/mm^2.
韓吉永 조선대학교 동력자원연구소 1988 動力資源硏究所誌 Vol.10 No.2
It has been thought that by analyzing and considering the shock strength and fracture of impact load. We can accurately determine strength and thus it will be helpful in optimum design. In this experimental study the following results were obtained by using the instrumented impact test for SUS 316. 1) The total charpy impact energy is progressively decreased by increasing the shock pressure. 2) The dynamic yield strength is increased by increasing the shock pressure for all test temperatures. 3) The ration of dynamic yield to static yield strength was found to decrease with increasing chock pressure.
한길영,김진석,안동규 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1
The objective of this research is to investigate the electromagnetic interference(EMl) shielding characteristics of aluminium sandwich panel. We fabricated aluminium sandwich panel with core material Ni-Cu fabrics. The measurements of shielding effectiveness(SE) were carried out frequency range 300MHz -1 GHz for commercial purposes such as electric or telecommunication devices. The return loss and loss due to absorption were also measured as a function of frequency in the microwave(300MHz-1GHz) region. It is observed that the SE of the composites is the frequency dependent, increases with the increases in filler loading. The Ni-Cu fabrics core material showed higher SE compared to that of AI. The aluminium sandwich panel was shown to exhibit up to 40dB of SE.The results indicate that the composite having higher filler loading can be used for the purpose of EMI shielding as well as for some microwave applications.
高强度 알루미늄合金의 動的波壤靭性에 미치는 Notch先端 半徑의 影響
韓吉永 조선대학교 생산기술연구소 1992 生産技術硏究 Vol.14 No.2
Relationship between the dynamic fracture toughness and the notch root radius of high Strengch 7075 alloys aged in Various Conditions were investigated. The apparent fracture toughness is Strengthened with an increase of the notch root radius, ρ, and is independert of the aging Condition. The notch root radius does not affect the critical Value of fracture toughness, which depends on the mean free path of the inclusions over 1㎛.
韓吉永 조선대학교 동력자원연구소 1983 動力資源硏究所誌 Vol.5 No.1
This paperis the result of an experimental data concerning the relation between each strength and variable brazing condition. The specimens used in this experiment were made according to the configuration of KSB 0875. Each strengthes was measured by 54ton Universal tensile test machine. These examinations gave the results as fallows: 1) The tensile strength and shearing strength of a brazed joining part are reduced, as the clearance increases. The tensile strength is the greatest at about 0.3mm clearance and the shearing strength at about 0.4mm clearance. 2) As overlap distance increases, the shearing strength is reduced. 3) As thr basemetal is thickened, the tensile strength and shearing strength are reduced. 4) Under the state of combined stress, the strength is shown to the lowest at θ=30˚∼45˚, and at θ=70˚, the combined stress value of BCuZn and BAg is shown to be the same, and at 70˚or above, the joining part is not broken, but a basemetal part is broken by tensile.
한길영,이동기,최병기,오환교,신용욱,전수영 조선대학교 에너지.자원신기술연구소 1999 에너지·자원신기술연구소 논문지 Vol.21 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, tensile failure load and displacement of one yarn, four yarns and knitted fabrics of ten yarns of kevlar fiber were determined experimentally in the unidirection. Mechanical properties of plain weft knitted fabrics reinforced composite intrusion beam for car side door application were investigated experimentally, which compared with desire value of American Fedral Motor vehicles Safety Standard (FMVSS) and presented the results.
콘크리트 구조물용 GFRP리바의 기계적 특성에 관한 연구
한길영,이동기,김성용,전상기,최종대,박준식 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2
In this paper was studied on the mechanical characteristics of Glass Fiber Reinforced Plastics(GFRP) of the steel bar it is to replace The advantage of FRP such as high strength low weight and chemical inertness or noncorrosiveness can be fully exploited. GFRP bar were successfully fabricated at 10mm nominal diameters and hollow types using a pultrusion method Tensile and bending specimens from this bar were tested and compared with behavior of GFRP rebar and steel bar.
한길영,김기열,윤태순 한국기계가공학회 2015 한국기계가공학회지 Vol.14 No.2
This study investigated electromagnetic interference (EMI) shielding effectiveness (SE) of hybrid conductive fabrics. The coaxial transmission line method was used to measure the EMI Shielding effectiveness of the conductive fabrics. 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 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 maximum electromagnetic shielding effectiveness (EMSE) values of sandwich type C/A/C (carbon fiber sheet/aluminum foil tape/carbon fiber sheet) and C/Ni/C (carbon fiber sheet/magnetic shielding foil/carbon fiber sheet) samples were 55 dB and 113 dB, respectively, at a frequency of 1.9 GHz.