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노형도(Hyung Doh Roh),박영빈(Young-Bin Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
A carbon-glass hybrid fiber textile, fabricated by weaving continuous carbon and glass fibers simultaneously, is a unique reinforcement material that can compromise between performance and cost. It has long been known that carbon fiber-reinforced polymer composites ? continuous or chopped ? exhibit piezoresistive behavior, characterized by an increase in electrical resistivity upon mechanical loading. However, studies on piezoresistivity due to intra-/inter-tow and interlaminar interactions have been limited, not to mention the piezoresistivity of carbon-glass hybrid fiber composites. This paper presents an investigation of the self-sensing behavior of carbon-glass hybrid fiber composites from a monofilament level to single-tow and woven-fiber composite levels. It was found that the overall piezoresistivity of hybrid fiber composites is affected by complex combinations of the intrinsic piezoresistivity behavior of a monofilament, radial shrinkage of tows, inter-tow contacts, and interlaminar resistance changes. The piezoresistivity behavior of woven carbon fiber-reinforced composites was also characterized to provide the reference data and to elucidate the unique self-sensing features of hybrid fiber composites. Carbon-glass hybrid fiber composites can serve as self-sensing structures in various fields, including aerospace and civil infrastructures, and the findings from the study allow the composite engineers to tailor the composite design.
입자영상유속계와 컴퓨터 시뮬레이션을 이용한 분기관내 유동해석
서상호,최을,노형운,도덕희,Sub, Sang-Ho,Choi, Yul,Roh, Hyung-Woon,Doh, Deog-Hee 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.1
The objective of the current study is to understand steady 3-dimensional flow phenomena in a bifurcated duct experimentally. A bifurcation model is fabricated with transparent acrylic resin to visualize the whole flow field with the PIV system. The gray level cross-correlation method is applied to the image processing algorithm. The subpixel and the area interpolation methods are used to obtain the final velocity vectors. The finite volume predictions are used to analyze the flow patterns in the bifurcation model. The results of the computer simulation and the PIV experiment for three-dimensional flow show the recirculation zone and the formation of the paired secondary flow distal to the apex of the bifurcation model. The results obtained with the two methods also show that the branch flow strongly strikes the inner wall due to the inertial effect and accompanied helical motion as it flows toward the outer wall.