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적층판으로 제작된 고온초전도 한류기의 Hot-Spot에 대한 열응력 해석
양경진(Kyeong-Jin Yang),강기주(Ki-Ju Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Analysis for the stress distribution in the laminated plates containing a hot-spot(localized heating region) is performed. It is assumed that the hot spot induces only mechanical stress by the thermal expansion but effect of the thermal conduction is neglected. That is, the hot spot is regarded equivalent 10 a homogeneous inclusion expanding in a laminated medium. As an example, Au/YBCO/AI₂O₃ laminate which is often employed for high temperature superconducting Fault Current Limiter(FCL) has been analyzed. Effects of heat input, thickness of each layer and the hot spot size upon the stress distribution in the hot spot have been investigated. For a constant heat generation into the hot-spot, as the thickness of the AI₂O₃ substrate increases, the stress in the YBCO layer is peculiarly oscillated. The curvature of laminate has a maximum at a certain thickness of the AI₂O₃
보강재가 접합된 직교이방성 평판 복합체 열응력의 이론적 해석
양경진(Kyeong-Jin Yang),이기영(Ki-Young Lee),이태훈(Tae-Hoon Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Analyzed was the thermal stress for one-sided bonded repair as an inclusion in an infinite orthotropic plate with non uniform temperature distribution that might be approximated by a polynomial. One might regard the one-sided bonded repair typically used for resisting the crack growth in a plate as an inclusion in the plate inclusion model, in which the integral type general solutions for the in-plane and out-of-plane displacements on the mid-plane of the plate were derived. These results were applied to the analysis of the thermal stress for an inclusion with non uniform temperature distribution. For mathematical convenience, we consider an inclusion with a linear temperature distribution. The expressions for the displacements were decomposed in order to separately investigate the effects of the constant and the first-order term of the temperature distribution.
연성재료의 균열진전에 따른 A<sub>2</sub>의 변화; 실험적 측정
김헌중,김동학,양경진,강기주,Kim, Heon-Joong,Kim, Dong-Hak,Yang, Kyeong-Jin,Kang, Ki-Ju 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.1
A way to measure the second parameter $A_2$of CT specimens is described. The displacement $\delta$$_{5}$ which is measured continuously from visual images of the lateral surface during crack growth is used to calculate the A, as a function of crack growth. The crack length is measured by DCPD(Direct Current Potential Drop) method and the J-resistance curve is determined according to ASTM standard E1737-96. To prove the validity of this method, three dimensional finite element analyses were performed, and variations of the displacements $\delta$$_{5}$ and $A_2$along the thickness were explored. As the result, it has been shown that the $\delta$$_{5}$ measured from the visual images of the lateral surface and the corresponding $A_2$can be regarded as the average through the thickness for 1T and 1/2T specimens of SA106Gr.C steel.steel.
주위 가스 속도에 따른 고온가스내의 입자 거동에 관한 연구
최재혁(Jae-Hyuk Choi),양경진(Kyeong-Jin Yang),이기영(Ki-Young Lee),윤두호(Doo-Ho Yoon),윤석훈(Seok-Hun Yoon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The effect of surrounding air velocity on the soot depos ition on a solid wall in high temperature was investigated in a microgravity environment to attain observations of the process. An ethylene(C₂H₄) diffusion flame was formed around a cylindrical rod burner in surrounding air velocity of vair=2.5, 5, and 10 ㎝/s with oxygen concentration of 35 % and wall temperature of 300 K. Laser extinction was a dopted to determine the soot volume fraction distribution between the flame and burner wall. The experimental results show that the soot particle distribution region moves closer to the surface of the wall with increas ing surrounding air velocity. A numerical simulation was also performed to understand the motion of soot particles in the flame and the characteristics of the soot deposition to the wall. A comparison of the calculations and experimental results led to the conclusion that a consid eration of the thermophoretic effect is essential to understand the soot deposition on walls.