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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.
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$^{\circ}$.
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.
金允海(Yun-Hae Kim),金永植(Young-Sik Kim),西谷弘信(Hironobu Nisitani) 한국해양공학회 1993 韓國海洋工學會誌 Vol.7 No.2
The static tensile tests of GFRP, ID300, CFRID300 and CFRPEEK were made on the plain and notched specimens at room temperature. The results were discussed based on linear notch mechanics which was proposed by H.Nisitani.<br/> The fracture of notched GFRP, ID300, CFRID300 and CFRPEEK specimens is controlled by the elastic maximum stress, σ<SUB>max</SUB>, and the notch root radius, p, alone, independently of the other geometrical conditions. The relation between fracture nominal stress, σ<SUB>c</SUB> and stress concentration factor, K<SUB>t</SUB>, is to be classified into two parts, namely, a part where σ<SUB>c</SUB> decreases with increasing K<SUB>t</SUB> and a part where σ<SUB>c</SUB> is nearly constant independent of K<SUB>t</SUB>. A similar phenomenon can be seen in the fatigue tests of notched specimens under rotating bending or push-pull.<br/> The almost constant σ<SUB>c</SUB> values correspond to the nearly constant apparent stress intensity factor, K<SUB>lpc</SUB> values, obtained by assuming p=0. This can be attributed to the existence of the stable crack. Linear notch mechanics is very useful for analyzing the static tensile fracture behavior of notched GFRP, ID300, CFRID300, and CFRPEEK specimens.
김윤해(Yun-Hae Kim),박근실(Kenn-Sil Park),배성열(Sung-Youl Bae) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
FRP boats have been widely used because of their high specific strength, high specific stiffness and etc. Although these kinds of FRP boats have various merits in applications, it has been had one of the complicated problems to manufacture their wooden mold. For these reasons, the simple methods to manufacture the mold required in the FRP boat industries. To improve these kinds of problems, the molding system using composite materials was developed. By this new manufacturing techniques, high functional FRP boat was built. Comparing with wooden mold, the process efficiencies of frame manufacturing process and inner mold manufacturing process were approximately 40% and 70%, respectively.
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.
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.
김윤해(Yun-Hae Kim),이진우(Jin-Woo Lee),박창욱(Chang-Wook Park),박수정(Soo-Jeong Park) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.4
Today, carbon fibers are used as heating elements. Carbon fibers are generally used to reinforce composite materials because they are lightweight and have a high strength and modulus. Carbon fiber reinforced composite materials are used for aerospace, automobile, and wind turbine blade applications. This work explored the possibility of using carbon fiber reinforced composite materials as self heating materials. The temperatures of the carbon fiber reinforced composites were measured. These results verified that the carbon fiber reinforced composite materials could be used as heating elements. A glass fiber was laminated using various methods. The thermal characteristics of the composites were evaluated. This confirmed that the generation of heat varied according to the lamination thicknesses of the carbon fiber and glass fiber. As the number of carbon fiber laminations increased, the heat-generating temperature increased. In contrast, as the number of glass fiber laminations increased, the amount of heat decreased. The generation of heat and ability to remain warm could be controlled by controlling the carbon fiber and glass fiber laminations.