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소형 선박용 복합재료 축 설계를 위한 음력해석에 관한 연구
김윤해,임철문,배창원,왕지석,Kim, Yun-Hae,Im, Cheol-Mun,Bae, Chang-Won,Wang, Ji-Seok 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.2
It is known that the composite material shafts using on small boats have various advantages comparing to forged steel shafts, fur examples, specific strength, fatigue strength, corrosion, etc. The analysis of the stresses and strains in the composite material shafts made by filament winding method is presented in this paper. The classical laminated plate theory is applied on the patch cut from the composite material hollow shafts. It is verified that the composite material hollow shafts of diameter 40 mm is the most optimum when the ratio of the inner diameter to the outer is 0.4 and winding angle is 45$^{\circ}$. It is also proven that the shear strain does not change seriously between 30$^{\circ}$and 60$^{\circ}$of winding angles. It is dangerous when the winding angle is over 75$^{\circ}$because the values of shear strain and stress produced on the shaft are too high so it must be avoided to wind the filament by the angle over 75$^{\circ}$.
다구치 방법을 이용한 복합재료 자동차용 마찰재의 마찰특성에 관한 연구
김윤해,이정주,Kim, Yun-Hae,Lee, Jeong-Ju 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
It has many variables and factors to design the friction materials for automotive brake pads. The purpose of this study is to develop the proper method for design of low-cost and to know friction characteristics of each raw materials. For the purpose of examining the effect of each major raw materials, we used the Taguchi L9(3$^4$)orthogonal matrix and 1/5 scale dynamo machine for evaluation of the friction characteristics of composite brake pads. By adapting the Taguchi method, it is easy to investigate the influence of each component in complicated composites friction materials. After analyzing the testing results by the Taguchi method, the effect of factors and levels influenced friction behavior was studied.
하니컴 샌드위치 Panel을 이용한 LCD/PDP 생산 공정용 경량 고기능성 복합 신소재 파렛트 제조 및 그 특성 평가
김윤해,최병근,손진호,조영대,엄수현,우병훈,Kim, Yun-Hae,Choi, Byung-Geun,Son, Jin-Ho,Jo, Young-Dae,Eum, Soo-Hyun,Woo, Byung-Hun 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.2
A typical honeycomb sandwich panel consists of two thin, high-strength facings bonded to a thick, light-weight core. Each component by itself is relatively weak and flexible, but when it combined in a sandwich panel they produce a structure that is stiff, strong, and lightweight. To prove the suitability the honeycomb sandwich structure with prepreg, the mechanical properties of the skin materials and honeycomb sandwich structure were evaluated with the static strength tests. Accordingly, the honeycomb sandwich structure made by autoclave process is available for a panel on LCD/PDP assembly line.
흡습 환경 하의 폴리프로필렌/유리 섬유 강화 복합재료의 환경 열화 특성
김윤해(Yun-Hae Kim),박창욱(Chang-Wook Park),정경석(Gyung-Seok Jung),신석진(Seok-Jin Shin) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.6
In this study, a mixture of polypropylene fibers and glass fibers were used to weave polypropylene/glass fiber-reinforced composite panels with characteristics such as highly elongated short fibers, high ductility, anti-fouling, and hydrophobicity as a result of a directional property. Mechanical and environmental tests were carried out with specimens fabricated with this composite panel, and its applicability to shipbuilding and ocean leisure industries was evaluated through a comparison with existing glass fiber-reinforced composite materials. The results of this experiment verified the excellence of the polypropylene/glass-mixed woven fiber-reinforced composite material compared to the existing glass fiber-reinforced composite material. However, the forming process needs to be changed to improve the weak interfacial bonding, and the properties of the composite material itself could be improved through mixed weaving with other fibers after development. Maximizing of the advantages of the polypropylene fibers and overcoming their shortcomings will improve their applicability to the shipbuilding, ocean leisure, and other industries, and increase the value of polypropylene fibers in the composite material market.
ZnO/Ag Multilayer의 투과율과 전도성에 관한 연구
김윤해(Yun-hae Kim),김도완(Do-wan Kim),무라카미 리이치(Ri-Ichi Murakami),문경만(Kyung-man Moon),이성열(Sung-Yul Lee) 한국해양공학회 2011 韓國海洋工學會誌 Vol.25 No.1
This study has lowered the specific resistance by coating a thin film layer of Ag, playing the role of the electron donor on the ZnO that is used usefully for the transparent conductive oxides. Presently, this study has examined the transmittance and electric characteristics according to the thickness of the Ag thin film layer. Also, this study has observed the transmittance and electric characteristics according to the uppermost ZnO thin film layer of ZnO/Ag/ZnO symmetric film and has conducted the theoretical investigation. In order to observe the transmittance and electric characteristics according to the thickness of the Ag thin film layer and the uppermost ZnO thin film layer, this study conducted the film deposition at room temperature while making use of the DC magnetron sputtering system. In order to see the changes in the thickness of the Ag thin film layer, this study coated a thin film while increasing by 4㎚; and, in order to see the changes in the thickness of uppermost ZnO thin film layer, it performed the thin film coating by increasing by 5㎚. From the experimental result, the researchers observed that the best transmittance could be obtained when the thickness of the Ag thin film layer was 8㎚, but the resistance and mobility increased as the thickness got larger. On the other hand, when the thickness of the uppermost ZnO thin film layer was 20㎚, the experiment yielded the best transmittance with excellent electric characteristics. Also, when compared the ZnO/Ag asymmetric film with the ZnO/Ag/ZnO symmetric film, the ZnO/Ag asymmetric film showed better transmittance and electric characteristics.
적층시간에 따른 PET기반위의 ZnO/Ag/ZnO박막의 특성 연구
김윤해(Yun-hae Kim),이진우(Jin-Woo Lee),Ri-Ichi Murakami,하진철(Jin-cheol Ha),문경만(Kyung-man Moon) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Transparent conductive oxides (TCOs) have been extensively used in optoelectronic device because of their high visible transmittance, low DC resistivity, high infra-red reflectance and absorbance in the microwave region. Zinc oxide is a direct wide-band gap II-VI n-type semiconductor material with the structure of wurtzite hexagonal structure. Zinc oxide has energy bandgap 3.37 eV and exciton binding energy of 60 meV at room temperature. We study using ZnO/Ag/ZnO films were deposited onto PET substrate at room temperature with the inclined opposite target type DC magnetron sputtering equipment. ZnO/Ag/ZnO multilayer films having high transmittance of 78.3 % and low sheet resistance of 1.974 Ω/sq. are successfully fabricated and can be reproduced by controlling the preparation process parameters properly.
김윤해(Yun-Hae Kim),배성열(Sung-Youl Bae),조영대(Young-Dae Jo),문경만(Kyung-Man Moon) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.11
This research investigated to find out the possibilities of applying FRPs to the AUVs. In this study, two kinds of metal materials, which is one of the popularly used materials for manufacturing AUVs, and 6 kinds of FRP materials were considered. Material properties of FRPs were derived by tensile tests and chemical analysis. Moreover, various types of AUVs were designed by 8 kinds of materials. From structural analysis, we can find out that the weights of AUV by CFRP-Autoclave could be reduced by 60% in comparison with the weights of AUV by Al 7075-T6. Also, 40% weight reduction could be expected compared to the AUV by Ti-6Al-4V. In this result, we could conclude that the material of CFRP-Autoclave have various merits and potentialities as one of the AUV materials.
호버크래프트 블레이드의 Erosion Shield 접착특성
김윤해(Yun-Hae Kim),김태현(Tae-Hyun Kim),조영대(Yong-Dae Jo),배창원(Chang-Won Bae),강병윤(Byong-Yun Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Hovercrafts are useful transportations because it can be operated both and water. Blades for hovercraft ara one of the most important part but it can be damaged by environmental factors. The erosion shield is applied to prevent erosion damage of the blades. Bonding properties between the blade and the erosion shield are very important. This paper is trying to identify the bonding characteristics according to surface treatment. In this study, three kinds of bonding layers and five kinds of surface treatment were applied. Test was achieved according to ASTM D 1002. From the test results, mechanical treatment like etching is the most effective solution than other chemical treatment and the impact absorption pad to reduce the impact damage decreases bonding strength within are experimented range.
첨단 소재와 공법을 응용한 무인잠수정의 최적설계에 관한 연구
김윤해(Yun-Hae Kim),배성열(Sung-Youl Bae),조영대(Young-Dae Jo) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
This research investigated to find out the possibilities of applying FRP to the AUV's material. In this study, two kinds of metal materials, which is one of the popularly used materials for manufacturing AUVs, and 6 kinds of FRP materials were selected. Material properties of FRP were investigated by mechanical and physical tests. Moreover, the material properties were applied to the structural analysis. From the simulation, we can find out that the weight of AUV by CFRP-Autoclave could reduce 60% of weight relate to the AUV by Al7075-T6 and 40% of weight could be reduced relative to the AUV by Ti-6AI-4V. In addition, the material of CFRP-Autoclave have sufficient mechanical properties comparing to Al alloy and Ti alloy by structural analysis.