http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Commingled Yarn을 사용한 열가소성 복합재료의 급행강도 연구(II) -굽힘 강도 이방성-
이덕래,최경은 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.3
Thermoplastic composite is stronger and lighter than thermosetting composite, and it has great compression strength and high processability. However, the thermoplastic resin is difficult to be impregnated into the reinforced fiber because the resin is a ploymer and its melt viscosity is high. Unidirectional composites were fabricated by using commingled yarn that consisted of glass fiber as reinforcing fiber and PP, nylons and PET as matrix fibers. Longiludinal(0$^{\circ}$), 30$^{\circ}$, 45$^{\circ}$, 60$^{\circ}$, and transverse(90$^{\circ}$) bending strength were investigated by three point bending text. The results were as follows : Bending strength of commingled yarn composites were higher than that of uncommingled yarn composites in each direction.
Commingled Yarn을 사용한 열가소성 복합재료의 굽힘강도 연구(I)-냉각조건과 가압시간의 영향-
이덕래,최경은 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.11
Unidirectional composites were fabricated under different cooling conditions and holding times by using commingled yarn which consisted of glass fibre as the reinforcing fibre and PP. Nylon6 and PET as the matrix fibres. Longitudinal bending stress was investigated by three point bending test. The relationships between the bending stress and the fabricating conditions (cooling, holding time and molding pressure) of thermoplastic composites were discussed.
Commingled Yarn을 사용한 열가소성 복합재료의 굽힘강도 연구(III)
이덕래,임동희 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.6
Thermoplastic composites have great advantages over thermoses composites in productivity and their propels. However, thermoplastic composites have not been used so widely because of the difficulty in impregnation of their materials. In this study, the unidirectional composites were fabricated under different cooling conditions by using companioned yarn and uncommingled yarn. It was investigated that the bending strength at the longitudinal(0$^{\circ}$) and transverse(90$^{\circ}$) directions, DSC analysis and X-ray dieaction analysis of thermoplastic composites which consisted of polypropylene(PP), nylon6(Ny6) and polyethylene telephtalate(PET) as the matrix fiber and glass fiber as the reinforcement, respectively.
Braid구조를 갖는 Commingled Yarn을 사용한 열가소성 복합재료의 인장특성 연구
이덕래,최경은 한국섬유공학회 1995 한국섬유공학회지 Vol.32 No.9
The thermoplastic resin is difficult to be impregnated into the reinforced fiber because the resin is a polymer and its melt viscosity is high. Commingled yarn has been developed in order to overcome the difficulties that are experienced when thermoplastic materials are impregnated to reinforce composite materials. Tensile and bending properties of thermoplastic braid composites were discussed. The middle-end-yarn and axial yarn were used to raise strength of thermoplastic braid composites. Tensile properties of thermoplastic braid composites were almost saturated from the molding pressure of 2.0MPa, however, the bending properties were increased along with the molding pressure. The tensile strength of the slow cooling type in double wrapped spun yarn(DSY) thermoplastic braid composites was higher than that of the rapid cooling type.
李德來 전북대학교 공업기술연구소 1978 工學硏究 Vol.8 No.-
The purpose of this investigation was to find what determines the load-extension properties of warp knitted fabric. 1) The bendingmoment in the underlap was small, so that the loop can be approximated to by simple elastica. 2) The resistance to deformation during initial extension of knitted fabric was governed by the resistance of the loop. 3) Grosberg's theory is quite applicable to practical use if the fabric tension is low and maximum extension is independent of the cloth structure.