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하나콤 코어로 보강된 복합재료 샌드위치 구조물의 오토클레이브 성형시 발생되는 결함 원인 분석과 그 최소화 방안
권순철,임철문,최병근,이세원,한중원,김윤해 한국마린엔지니어링학회 2000 한국마린엔지니어링학회 학술대회 논문집 Vol.2000 No.-
본 논문의 목적은 허니콤 코어로 보강된 샌드위치 항공기 구조물 제작 시 오토클레이브 성형 과정 중에 발생되는 결함의 원인을 분석하고, 이를 최소화시키는 것이다. 결과적으로 금형의 곡률, 코어 두께, 저글 높이 등과 같은 구조물 및 금형의 형상과 오토클레이브 경화 조건인 승온율, 승압율 등이 core movement, core wrinkle, core depression 및 bridge phenomenon 등의 결함 발생에 큰 영향을 미치고 있음을 알 수 있었다.
필라멘트 와인딩 공법에 의한 소형 선박용 복합재료 축 설계를 위한 응력해석에 관한 연구
배창원,임철문,왕지석,김윤해 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.3
The purpose of this study is to design and the analyze the stress of composited shaft which is wound by filament winding method. The composites shaft has high strength and reduction in weight compared to metal shaft. The classical laminate plate theory(CLT) was used fro analysis the stress, and for structure design. In order to replace metal shaft by composites shaft, the diameter of shaft was determined to $\phi$ 40. The ration of diameter was determined to 0.4 for torsional moment with CLT. In this result of analyzing the stress, composites shaft was safe $30^{\circ}~60^{\circ}$C of winding angle, and was fractured on $90^{\circ}$.
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$^{\circ}$.
필라멘트 와인딩 공법으로 제조된 복합재료 NOL Ring 시험편의 최적 인장강도의 평가법에 관한 연구 -풍력발전용 복합재료 터빈블레이드 제조 및 평가를 목적으로-
배창원,권순철,임철문,엄수현,김윤해 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.1
Filament winding process is a comparatively simple operation in which continuous reinforcements in the form of roving are wound over a rotating mandrel. And now it is well established as a versatile method for storage tanks and pipe for the chemical and other industries. In this study, tensile strength of a filament wound ring specimens were evaluated by split disk test fixture and dress disk test fixture. The results obtained from experiments were compared with the theoretical values obtained by the rule of mixture. And the purpose of this paper is to suggest an appropriate test method for the evaluation of tensile properties of filament wound structures. The tensile strength of a ring specimens tested by the dress disk test showed better agreement with the theoretical values than of a ring specimen tested by the split disk test because the stress concentration in edges of s split disk test fixture is more severe than the that of dress disk test fixture. The results showed that the tensile strength of a ring specimen was influenced by the geometry of test fixture, the continuity of fibers, fiber-tension, fiber-end and stress concentration in specimen.