http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
한명수 대한용접접합학회 2020 대한용접·접합학회지 Vol.38 No.3
The welding-induced buckling distortion is one of the prime concerns in the welded thin plate panels. In this study, an analytic scheme of the plasticity-based elastic buckling prediction was proposed to assess the welding-induced buckling sensitivity of the thin plate panels. Through the scheme, the effect of the structural design and welding fab�rication variables on the buckling sensitivity has been analytically investigated. Experiments were also conducted to observe the welding distortion in the test panels. It was found that buckling was unavoidable unless the heat input to the thin plates during butt welding was adequately controlled. It was noted that the buckling distortion in thin plate panels may not be satisfactorily prevented either by considering only the structural arrangement or by controlling only the welding variables. Therefore, the integrated structural design is required in addition to the consideration of welding parameters for the panel assembly. Under those circumstances, it is expected that the proposed scheme can be an effective measure to identify whether an integrated structural and welding design for the thin plate panels can be put in production or if it should be withdrawn for further engineering consideration.
Thermal Annealing Eects on the Crystal Structures of Bulk ZnO
한명수,Young S. Park 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
We characterized the effects of thermal annealing on bulk ZnO materials in ambient O2 by using atomic force microscopy and x-ray diffraction. By thermally annealing the bulk ZnO materials, we greatly reduced the surface roughness. The grain size and the density of the threading dislocations were calculated by measuring the rocking curves of the symmetric plane and the φ scan of the asymmetric plane. The density of the screw threading dislocations was decreased by about one order from ∽106/cm2 to ∽105/cm2 after annealing; while the density of the edge threading dislocations was almost constant at ∽4.2 × 108/cm2.