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김윤해(Y.H.Kim) 한국해양대학교 해사산업연구소 1997 海事産業硏究所論文集 Vol.6 No.-
Filament winding method is widely used for composite fabrications using low viscosity liquid formation and processing asymmetrical structures of pressure vessel, pipe, rocket motor case etc. The filament winding method is affected by several parameters such as pot life of process time, viscosity of resin, filament winding temperature and schedules, curing condition, post curing condition of resin. The degree of robin impregnation and void contents was measured by tension. To develope high functional composite materials the rotation(5, 10, 15, 20, 30rpm) was controlled by D.C motor. And the wiper to give proper tension was equipped between strand and robin bath. The resin is hooked by the design wiper and the viscosity of resin was measured by viscometer. The adequate cure schedule was found by DSC. NOL ring test is carried to investigate the basic physical properties such as stress analysis, design technology of structure of winding.
용사처리에 의한 자동차 브레이크용 마찰재료의 마찰성능개선에 관한 연구
김윤해(Y. H. Kim),배창원(C. W. Bae),손태관(T. K. Shon),김봉식(B. S. Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Friction materials that are used in brake linings and clutches have severe performance requirements. The principal function of such frictional elements is to convert kinetic energy to heat and then either to absorb or otherwise dissipate the heat while simultaneously, through friction, reducing the relative movement between the friction material and the part to which it is engaged. In order to achieve these objectives, the coefficient of friction must be as high as possible, independent of variations in operating conditions, and the necessary energy conversion must be accomplished with a minimum of wear on the contacting parts. The friction material, in addition to having a relatively high coefficient of friction, should be durable and heat stable, and should generate little or no noise while in rubbing contact with the engaged part. This study focused on the improved frictional performance of friction material by spray treatment. In the case of the spray treatment the aluminum bronze sprayed specimen showed the most excellent frictional characteristics and anti-corrosive effect in our experimental ranges.
열분석시험을 통한 항공기 복합재료 부품의 수리 시 반복경화에 따른 물성변화 측정에 관한 연구
엄수현(S-H. Eum),이상언(S-U. Lee),한중원(J-W. Han),김국진(K-J. Kim),김영식(Y-S. Kim),김윤해(Y-H. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
Recently, composites have been widely applied in the sporting goods, automobile, aerospace industry. As the use of advanced composites increase, specific techniques have been developed to repair damaged composite structures. In order to repair the damaged part, it is required that the material in the damaged area be removed first by utilizing the proper method, and prepreg be laid up in the area and cured under vacuum using the vacuum bagging materials. In curing process, either in an oven or autoclave is to be delamination can be occurred in the sound areas during and/or after the exposure to the elevated curing temperature in case that the repair process is repeated. Therefore, this study was conducted to evaluate the degree of degradation of properties of the cured parts and how it affects to the delamination phenomenon between laminated skin and honeycomb core.