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고유변형률 직접 적용을 이용한 원통 박판 구조물의 레이저 용접 변형 예측
윤지홍(Ji-Hong Yoon),양영수(Young-Soo Yang),김성훈(Sung-Hoon Kim),이세환(Se Hwan Lee),박정웅(Jeong-Ung Park) 대한용접·접합학회 2024 대한용접·접합학회지 Vol.42 No.1
In this study, a simplified analysis method by directly applying inherent strain (DIS) at integration points to predict welding distortion of cylindrical shell structures was suggested. The 3D thermo-elastoplastic method demands substantial computational time. The strain as direct boundary (SDB) simplified method using virtual temperature encounters challenges in consecutive thermal structural analysis including welding distortion. The suggested method (that is, DIS) offers the advantage of enabling continuous thermal structural analysis after welding distortion analysis, with computational efficiency. To calculate inherent strain, lap laser welding with 2 mm and 2.6 mm SUS304 plates was performed, measuring fusion and heat-affected zone sizes via cross-sectional observations. Using the calculated inherent strain and our suggested direct input method, we conducted welding analysis and welding test on cylindrical shell structures. Comparison of welding distortion under same conditions revealed radial distortion difference within approximately 10%, corresponding with the experimental result and confirming a computational time reduction by over 2,000 times than those of thermo-elastoplastic analysis. Therefore, an efficient and accurate prediction of welding distortion was achievable through the suggested method.
윤지홍,양호근 안동대학교 기초과학연구소 2000 基礎科學 硏究論文集 Vol.11 No.1
The hypocyclodial pinch (HCP) equipment has been fabricated and used to improve the efficiency of Ti:Sapphire laser. The experimental result shows that the BBQ(5 ×10^(-6) mol/l) and BBO(1 ×10^(-4) mol/l) dyes turn out to be suitable converter dyes of laser dyes, which are the LD-490(4 ×10^(-4) mol/l) and C503(0.8 ×10^(-6) mol/l) dyes. The emission characteristics of the argon gas in the HCP show that the optimum output intensity yields at 20 torr of argon pressure and 8㎸ of input voltage. When the fluorescent energy converter dye has been used, the efficiency of Ti:Sapphire laser has been increased. The maximum enhancement of laser efficiency has been obtained, (i) when adding the BBO(1 ×10^(4) mol/l) dye into the LD-490(4 ×10^(-4) mol/l) dye with the same ratio, and (ii) when adding the BBQ(5 ×10^(-6) mol/l) dye into the C503(0.8 ×10^(-6) mol/l) dye with the same ratio.
a-Si :H 박막과 a-Si : H : B 박막의 광음향분광법
윤지홍 제주대학교 1986 논문집 Vol.23 No.-
Photoacoustic Spectra of glow discharge deposited hydrogenated amorphous silicon(a-Si : H) and boron-alloyed amorphous silicon (a-Si : H : B) films have been studied Optical gap of a-Si : H is 1.94 eV and that of a-Si : H : B is 1.56. This has broad band and high Urabch slope parameter.