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- 저자 : 오세빈(S.B.Oh) (검색결과 4 건)
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스테인레스 박강판의 IB형 Spot 용접이음재에 대한 응력해석과 피로강도 평가
오세빈(S.B.Oh),손일선(I.S.Sohn),배동호(D.H.Bae) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
Stainless steel sheets are commonly used in railroad cars or commercial vehicles such as the bus. Because strain of the large sized vehicles are generally large compare with small cars. even if stainless steel sheet have good mechanical properties. Fatigue strength of spot welded part is lower than that of base metal. And. Because fatigue strength of them is especially influenced by geometrical and mechanical factors of the spot welded joint. Welding conditions. A reasonable. Quantitative and systematic evaluation criterion for long life design of spot welded body strucrure of them must be established.<br/> In this report. Numerical stress analysis on the spot welded lap joint of SUS 304 sheet subjected to in-plane bending(IB signed) force by tension-shear load was performed using 3-dimensional finite element model.<br/> And fatigue strength of the IB-type spot welded lap joints having various thickness. Joint angle was evaluated. From their results. It was found that fatigue strength of the IB-type spot welded lap joints could be effectively and systematically rearranged by principal stress(∂ 1max) at the edge of nugget.<br/>
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변형에너지밀도에 의한 스테인레스 박강판 IB형 Spot 용접이음재의 피로강도 평가
오세빈(S.B.Oh),손일선(I.S.Sohn),배동호(D.H.Bae) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Stainless steel plates have been used for vehicles such as the bus and train. Because stainless steels have good mechanical properties, weldbility, resistance of corrosion, and fine appearance.<br/> By the way. to estabilish long life design criteria of spot welded structures using these materials, evaluate of fatigue strength their spot welded joints and systemetic arrangement of them.<br/> In this report, numerical analysis on the spot welded lap joint of SUS 304 sheet subjected to in-plane bending (IB signed) force by tension-shear load was performed using 3-dimensional finite element model. And fatigue strength of the IB-type spot welded lap joints having various thickness, joint angle, lapped length, and width were evaluated. Using their results, we tried systematic rearrangement to estabilish long life design criteria of spot welded IB type joints of SUS 304 sheet by strain energy density. It was found that fatigue strength of the IB-type spot welded lap joints could be effectively and systematically rearranged by strain energy density at the edge of nugget.<br/>
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오세빈(S. B. Oh),김은구(E. K. Kim),김진영(J. Y. Kim) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.4
Glass와 실리콘 웨이퍼(p-type(100), p=6~8 Ω-cm)를 기판으로 하여 NiFe/glass, NiFe/Si, NiFe/Al/Si, NiFe/Ti/Si의 박막을 제작하였다. 하지층으로 사용한 알루미늄과 티타늄은 RF 스퍼터링으로 증착하였으며 퍼멀로이 (NiFe) 필름은 60, 80, 90 wt% Ni로 조성을 변화시켜 증착하였다. 박막의 포화자화(M_s), 보자력 (H_c), 각형비 (F)는 sweep time을 1.7분으로 하여 시료 토크마그네토 메터로 측정하였다. 보자력에 영향을 주는 표면조도는 전자주사현미경(SEM) 과 표면조도 측정기로써 알아보았다. 실험결과 80 wt% Ni의 퍼멀로이에서 자장 중 열처리(35 Oe, 350℃) 후 약 1의 각형비를 나타내었으며 열처리 후 보자력이 떨어짐을 보였다. 자기이방성은 알루미늄을 하지층으로 한 퍼멀로이 박막에서 가장 좋은 값(K_u=-9.60×10^6 emu/㎤)을 나타내었다. A study on the magnetic properties of NiFe/glass, NiFe/Si, NiFe/Al/Si and NiFe/Ti/Si thin films has been performed. Aluminum and Titanum underlayers were deposited by using rf sputtering system, and permalloy (NiFe) films of 60, 80 and 90 wt% Ni were deposited by an ebeam evaporation system. The saturation magnetization (M_s), coercive force (H_c). and squareness ratio (F) of permalloy thin films were characterized by a vibrating sample magnetometer (VSM) and the values of anisotropy constant (K_u) were evaluated by utilizing a torque magnetometer. The surface roughness was also observed by using a scanning electron microscope (SEM) and a roughness tester. It was found that 80 wt% Ni permalloy films had the squareness ratio of 1 and their coercive forces were decreased after annealing at 350℃ under a magnetic field of 35 Oe. The magnetic anisotropies of 80 wt% Ni permalloy films with Al underlayer showed the most proper value of K_u=-9.60×10^6 emu/㎤ after magnetic annealing at 350℃ and 35 Oe.
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