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Title |
Numerical Studies on the Control Performance of Fiber Orientation for Nozzle with Inside Blades
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.157 |
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Keywords |
섬유보강시멘트복합체 ; 섬유 방향성 ; 블레이드 ; 노즐 ; 유한요소해석 Fiber-reinforced cement composite ; fiber orientation ; blade ; nozzle ; finite element analysis |
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Abstract |
This study is aimed at controlling the fiber orientation and improve the fiber distribution in fiber-reinforced cement composites using blades that can be placed inside the existing nozzles. To optimize the blade parameters, multi-physics finite element analysis was performed that could account for the flow of the cementitious matrix material, the movement of the entrained fibers, and the interactions with the nozzle. As a result, this study defined the blade distance, length, and position as a function of the fiber length to be used in the field. The blades with a distance from 1.2 to 2.4 times the fiber length and length from 4 to 8 times the fiber length, as well as located at below 14 times the fzfiber length from the nozzle exit maintained the fiber orientation angle less than 5°. In addition, the blade-type nozzle proposed in the study can be attachable and detachable to the conventional casting equipment, and thus it can provide the usability and convenience in practical applications.
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