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Moon-YoungKim,김남일,민병철 대한토목학회 2003 KSCE JOURNAL OF CIVIL ENGINEERING Vol.7 No.4
In the companion paper, an improved formulation for spatial stability analysis of non-symmetric thin-walled curved beams with shear deformation is presented based on the displacement field considering both constant curvature effects and the second order terms of semitangential rotations. Thus the elastic strain energy and the potential energy due to initial stress resultants are consistently derived. Also closed-from solution for in-plane buckling of curved beams subjected to uniform compression is newly derived for monosymmetric thin-walled curved beams under simply supported boundary conditions. In this paper, F.E. procedures are developed by using the curved beam elements with non-symmetric cross sections. Analytical and numerical solutions for spatial buckling of shear deformable thin-walled circular beams are presented and compared in order to illustrate the accuracy and the reliability of this study. In addition, the extensive parametric studies are performed on spatial stability behavior of curved beams. Particularly trasition and crossover phenomena of buckling mode shapes with change in curvature of beam on buckling for curved beams are investigated.
Tae‑Young Kim,Tae‑Wook Na,Hyung‑Seok Shim,Yong‑Keun Ahn,Yong‑Kwon Jeong,Heung Nam Han,Nong‑Moon Hwang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Penetrating morphologies at the growth front of abnormally-growing Goss grains in Fe–3%Si steel was examined in view ofthe possibility that they are the two-dimensional section of the solid-state wetting (SSW) along the triple junction line. Toobtain the statistically meaningful data, 102 penetrated grain and 204 penetrating abnormally-growing Goss grain morphologieswere examined. The misorientation angles of penetrating and penetrated grains were measured by electron backscattereddiffraction. Among the 102 examined penetrated grain boundaries, none has low misorientation angles less than 15°,whereas 17.2% of the 204 penetrating grain boundaries have low misorientation angles, and 23.5% of them have coincidencesite lattice boundaries. Besides, boundary energies of penetrating Goss grains, which were estimated from misorientationangles of the three grains in the penetrating morphology, satisfied the energetic condition for SSW along the triple junctionline. These results imply that the abnormal grain growth of Goss grains in Fe–3%Si steel occurs by the mechanism of subboundaryenhanced SSW.