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균질화법에 의한 다결정 형상기억합금의 기계적 거동 모델링
구병춘,조진,Gu, Byeong-Chun,Jo, Jin 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.5
We obtain a micromechanics-based Helmholtz free energy and then in the framework of irreversible thermodynamics, a kinetic relation, a martensitic nucleation criterion and the reorientation criterion of martensitic variants are obtained. These relations are valid for a three-dimensional proportional and non-proportional loadings and for a combination of mechanical and thermal loading. From the simulated pseudoelastic stress-strain relation of a single crystal with loading rate effect, polycrystalline behavior in case of proportional and non-proportional loading is predicted by a homogenization method. The obtained results are compared quantitatively with experimental results.
유한요소 해석에 의한 맞대기 용접 이음의 응력집중에 과한 연구
구병춘,최병일,김재훈 대한용접접합학회 2004 대한용접·접합학회지 Vol.22 No.4
The purpose of this study is to investigate the influence of weld bead profiles on stress concentration factors of double V groove butt-welded joints. The influence of three parameters such as toe radii, flank angles and bead heights on the stress concentration factors is studied by finite element analysis. It is shown that the three parameters have similar effects on the stress concentration factors. Finally a formula to estimate the stress concentration factors considering the three parameters and others is proposed and estimated results are compared with the results obtained by finite element analysis.
Al6061-T6 판재의 마찰교반용접 3D 유한요소 해석
구병춘,정현승,Goo, Byeong-Choon,Jung, Hyun-Seung 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.4
Friction stir welding (FSW) is a solid state joining method patented in 1991 by The Welding Institute (TWI). It is widely used for joining light metals such as Al and Mg alloys. Foreign railway vehicle manufacturing companies have been applying FSW to car body welding, but domestic companies are in the beginning of feasibility study. Therefore, lots of experimental and analytical study is needed. In this study, three-dimensional finite element modeling of the friction stir welding of two Al6061-T6 plates was carried out. And temperature field and residual stresses were obtained and compared to experimental results in the literature. It is found the analytic thermal field is in a good agreement with the experimental results, but there are some differences between numerical and experimental residual stresses.