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쉘요소의 두께방향 적분점 개수에 따른 스프링백 예측 분석
이동기(D. G. Lee),송민철(M. C. Song) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
Shell element modeling is applied to finite element analysis of sheet metal forming including bending work. In bending work analysis, however, the result by shell element model shows quite difference with real phenomenon in general. In this study, the number of integration points in thickness direction of shell element is focused on increasing springback prediction accuracy. In single curvature forming analysis, springback prediction accuracy shows increase proportionating to the number of integration points and this result is similar to former studies. In double curvature forming analysis, the formed radius of the blank is also increased along with the number of integration points.
섬유배향각 분포측정에 있어서 농도법의 정밀도에 미치는 섬유종횡비와 면적비의 영향
이상동,김혁,이동기,한길영,김이곤,Lee, S.D.,Kim, H.,Lee, D.G.,Han, G.Y.,Kim, E.G. 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.4
To investigate accuracy of intensity method for measurement of the fiber orientation distribution, fiber orientation function is calculated by drawing simulation figures for the fiber orientation as varying fiber aspect ratio, fiber area ratio, and fiber orientation state, respectively. The values of fiber orientation function measured by intensity method are compared with the calculated values of fiber orientation function. The results show that measurement accuracy of the fiber orientation angle distribution by intensity method is affected by the fiber aspect ratio when the total length of oriented fiber is same. The average gradient of fiber orientation function is 0.94 for 1000mm of the total fiber length and is 0.93 for 2000 mm when the fiber aspect ratio is over 50. Measurement accuracy by intensity method is about 94% and the reliable data can be obtained by intensity method.
한길영(G.Y.Han),이동기(D.G.Lee),김이곤(E.G.Kim),김기성(K.S.Kim) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.1
The hygrothermal efftect on three different types of Glass/Polypropylene was investigated under the environment of 40℃ distilled water. The residual strength of Glass/Polypropylene with randomly oriented and fiber content of 40wt%(R40) was found stable under the moisture content of 0.2%. In this case, the maximum moisture content was 0.53%. On the other hand, Glass/Polypropylene with unidirection and 42wt%(U42) and 50wt%(U50) fiber content, respectively, showed the residual strength less stable than R40. However, the maximam moisture contents were 0.52% and 0.45% respectively.