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Peirce 모델을 이용한 평직물의 역학적 거동에 관한 연구
전붕수,전소연,김영준 한국섬유공학회 2000 한국섬유공학회지 Vol.37 No.10
Using Peirce's model of plain woven fabrics, mathematical equations that can be used to predict the structure and mechanical behaviors were derived and their solutions were obtained. The structure of woven fabrics was defined in terms of the yarn number, fabric density, and yarn crimp, and the effects of these variables on the fabric structure were investigated. The boundary of structure of fabrics where Peirce's geometrical model could still be successfully applied was determined and the Poisson's ratio under uni-axial extension was obtained. The energy method was employed in order to derive mathematical equations for estimating mechanical properties of fabrics from the mechanical properties of yarns and the structural parameters of fabrics. Furthermore, the effects of intial modulus and bending rigidity of yarns on the load-extension relationships of woven fabrics were investigated.
전붕수,김민,Jeon, Boong-Soo,Kim, Min 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.1
A method to recognize the type of woven fabric was developed by employing neural networks. In the analysis, transmission image of the woven fabric was used to obtain the yarn position, while reflection image was used to obtain the ellipsoidal aspect ratio of warp/weft interlacing point. The Learning Vector Quantization algorithm was used as a neural network and trained by applying the aspect ratio as the input value. Three fundamental types of woven fabrics could be successfully recognized by the analysis.
섬유의 이상적인 마이그레이션이 실의 초기 탄성 거동에 미치는 영향
전붕수 한국섬유공학회 1994 한국섬유공학회지 Vol.31 No.11
The orientation density function of the fibers in a yarn has been newly defined and derived for the ideal migration structure, in which the fibers migrate regularly and uniformly from the outside to the center of the yarn and then back to the outside. The ideal migration behavior has been expressed in the mathematical equation by introducing the parameter JM defining rate of migration. The relative initial modulus of the yarn having the ideal migration structure was calculated by using the orientation density function and compared with that of the idealized helical structure. The initial modulus of the yarn has been found to decrease with the increase of the degree of migration.
섬유의 Migration이 실의 역학적 성질에 미치는 영향
전붕수 한국섬유공학회 1991 한국섬유공학회지 Vol.28 No.5
The orientation density functions of the fibers in the yarn were newly defined and derived for the four different migration structures, i.e., idealized helical, ideal migration, Treloar's theoretical migration, and conical migration structures. The relative initial moduli of the yarns having the migration structures were calculated and compared with each other at the several surface twist anglect. The initial moduli of the yarn decrease as the decree of migration increases for all migration structures studied.
전붕수,이재곤,김상용,Jeon, Bung-Su,Lee, Jae-Gon,Kim, Sang-Yong 한국섬유공학회 1981 한국섬유공학회지 Vol.18 No.4
In order to obtain the theoretical formulae for representing the biaxial load-extension behavior of plain-woven fabrics, a simple straight-line model was set up and the model was analyzed by Castigliano's theorem. And the graphical method was adopted to the equation. The theoretical results were presented for a plain-woven fabric subjected to biaxial load, and these were compared with experimental results.
전붕수,김성희 한국섬유공학회 1999 한국섬유공학회지 Vol.36 No.4
Crimps of plain woven fabrics in various relaxation states were measured and compared with the crimps calculated from the geometrical models for plain woven fabrics such as Peirce, straight line, circular arc, racetrack and lenticular models. Only straight line model was suitable for the crimping behavior of unrelaxed plain woven fabric, while circular arc and Peirce models were only applicable to crimps of completely relaxed flexible fabric. When fabric in more relaxed, crimp of fabric could be interpreted by applying racetrack and lenticular models.
전붕수,정영관 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.3
The draft process is one of the most important processes in textile processes that determine the quality of spun yarn. In general, the parameters of drafting process include the number of fibers in sliver cross section, orientation of fibers, structure of silver cross section, surface shape of fibers, fiber length, distribution of fiber length, pressure of roller, roller gauge, draft ratio, etc. In this study, the fiber behavior in draft zone was simulated using the computer programming with the important parameters such as arrangement of fibers in silver, speed change model of floating fibers, distribution of fiber length, draft ratio, roller gauge, and effective contact length between high speed fiber and floating fiber. The correlation of irregularity with each parameter was also investigated.
전붕수,김상용,김전사,Jeon, Bung-Su,Kim, Sang-Yong,Kim, Jeon-Sa 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.11
The theoretical equations representing the linear viscoelastic behavior of the spun bonded nonwoven fabrics were derived in terms of the mechanical properties of their constituent fibers and binders, and the orientation distribution functions. The linear 6 element viscoelastic model of the composite consisting of two 3 element models a fiber and a binder in series arrangement was applied for the characterization of the viscoelastic behavior of spun bonded nonwoven fabrics. Relaxation modulus and creep compliance of the spun bonded nonwoven fabrics predicted from the 6 element model showed a reasonable agreement with experimental results. The comparison of theoretical and experimental results of the dynamic modulus showed that the theoretical storage tensile elastic modulus more closely approached to the experimental value than the theoretical loss tensile elastic modulus.
장섬유 부직포의 점탄성거동(I) -섬유 배향분포 함수의 유도-
전붕수,김상용 한국섬유공학회 1990 한국섬유공학회지 Vol.27 No.4
The theoretical orientation distribution functions were derived to predict the viscoelastic properties of the spun bonded nonwoven fabrics. The functions were obtained in terms of the process variables, such as feeding velocity of the filament, velocity of the moving conveyor belt, velocity and maximum angle of the oscillating adaptor, and the angle between the filaments from the adaptor and the axis of the moving conveyor belt. The theoretical results were compared and discussed with experimentals, and they were nearly conicident.