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용접 후 응력제거열처리 조건에 따른 티타늄 합금 용접부 평가
최진강(Choi, Jin-Kang),이희준(Yi, Hui-Jun),양해진(Yang, Hae-Jin),조성원(Joo, Sung-Won) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5
티타늄 용접부는 수소취성과 잔류응력에 대한 영향을 최소화 하기 위해 용접 후 잔류응력 제거 열처리 작업을 수행하고 있다. 하지만, 현재 항공 분야에 널리 사용하고 있는 규격에 따라 열처리 온도가 다양하게 설정되어 있어 현장에 적용하기에는 어려움이 있다. 이에 규격 별로 대표하고 있는 열처리 조건을 선정하여 열처리 조건에 따른 용접부에 대한 잔류응력, 잔류수소량을 확인하였고, 용접부에 대한 강도와 충격 인성을 확인하였다.
자동차용 1500MPa급 초고강도강의 레이저 용접 특성에 관한 연구
최진강(Jinkang Choi),김종곤(Jonggon Kim),신승민(Seungmin Shin),김철희(Cheolhee Kim),이세헌(Sehun Rhee) 한국레이저가공학회 2010 한국레이저가공학회지 Vol.13 No.3
In this study, fundamental experiment was conducted with various strength of UHSS (Ultra High Strength Steel) by CO2 laser. And then, butt and lap joint laser welding with boron alloyed steel and Al-Si coated boron alloy steel have been done by changing laser beam feature, existence of gap and existence of coating layer to know welding characteristics of those materials. As a result, in case of fundamental experiment with various strength steel, hardening was found in the weld metal of all tested materials and softening was found at the heat affected zone of SGAFC 1180. In case of laser butt welding of UHSS, mechanical properties was improved by using small laser beam diameter and Al-Si coating layer caused fracture of weld metal. In case of laser lap welding of UHSS, Al-Si coating layer resulted in formation of intermetallic compound at the fusion boundary where fracture occurred. Al-Si coating layer caused lowering mechanical properties of weld metal.
Al 5052, 6061합금에 대한 플라즈마-GMA 용접공정특성 평가
김철희,안영남,최진강,이세헌,Kim, Cheol-Hee,Ahn, Young-Nam,Choi, Jin-Kang,Rhee, Se-Hun 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.6
In this study, the bead-on-plate welding were conducted by using GMA welding and plasma-GMA welding on Al 5052 and, Al 6061 plates. For these processes, the maximum welding speeds for full penetration were compared, and various weld qualities such as bead appearance, cross-section, cracks and porosities were examined. Faster welding speed, cleaner bead surface and more stable drop transfer could be achieved by plasma-GMA welding, compared with GMA welding.
Design of Interactive Meta-Holographic Display Using Liquid Crystallinity
Youngki Kim(김영기),김원식,최진강,김혜인,임준형 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The arrays of subwavelength-scaled nanostructures on a surface, often called metasurfaces, have made advances in flat optics because of their potential to display programmable hologram and miniaturize optical components. As previous metasurface systems are passive, however, their practical applications have been impeded. Accordingly, recent efforts have focused on the realization of active metasurfaces that can autonomously switch homographic images upon arrival of triggers. Nevertheless, the full potential of active metasurface system has yet to be realized due to the limitation of previous approaches, including limited design of nanostructures, complex fabrication process, and slow response. Here, we propose a simple and versatile approach to enable dynamically tunable metahologram systems by leveraging the optical anisotropic and stimuli-responsive nature of liquid crystals (LCs). We demonstrate the new class of active metahologram, a thin-layer of LCs integrated with multiplexing metasurface (LC-MS), to autonomously sense a programmed stimulus (e.g., electric field, temperature, pressure, toxic gas) and dynamically switch the holographic images.1,2 These attribute provides insight into the rational design of interactive meta-hologram display that enable their full potential of multifunctional active devices.