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대형 적층/가공 시스템에서 적층조건에 따른 인장강도에 관한 연구
오제하,국호형 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.6
In this paper, the CFRP(Carbon Fiber Reinforced Plastic) parts were printed and cut in a large-scale additive and subtractive hybrid manufacturing system. A method to increase the strength and durability of a product by identifying the interlayer adhesion during the printing process of a large-scale additive manufacturing hybrid system was investigated. According to the printing conditions(CF content, deposition temperature, compaction process), the specimen was printed and cut to determine the tensile strength in the printing direction. As a result of the experiment, the highest tensile strength was shown when ABS-CF 20wt.% Compound was printed at 230℃ extrusion temperature, and the higher the CF content of the material, the lower the tensile strength. As a result of observing the inside of the test piece through an optical microscope, a large number of voids were kept inside the test piece. To remove voids generated inside the test piece, a compaction process was applied to the additive manufacturing hybrid system to prepare a test piece. As a result, void size decreased, and the strength of the part showed a tendency to increase. It is thought that additive manufacturing with high tensile strength can be obtained through studies on the optimization of deposition conditions in additive manufacturing hybrid systems.
이경재,오제하,강신재,노병준 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
This study was carried out to investigate turbulent structure and mixing flow characteristics of a two-phase swirl jet nozzle. As a measurment system, a two-channel hot wire anemometer system was utilized and the data were treated by an on-line computer analyzing system. A swirl jet nozzle was designed to have a liquid jet in the central part of the nozzle and annular air jet in the outer part of the liquid column. In this study, the speed of air was measured using a hot wire anemometer system to understand flow characteristics of turbulence in single phase(air), and the mearsurement have been made in a fully developed turbulenct flow regions.<br/>