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고리 원전 가압기 PWOL의 용접 방향이 이종금속용접부 잔류응력 분포에 미치는 영향
배홍열(H-Y Bae),송태광(T-K Song),전윤배(Y-B Chun),오창영(C-Y Oh),김윤재(Y-J Kim),이경수(K-S Lee),박치용(C-Y Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Weld overlay is one of the residual stress mitigation method which arrest crack. An overlay weld sued in this manner is termed a preemptive weld overlay(PWOL). PWOL was good for distribution of residual stress of dissimilar metal weld(DMW) by previous research. Because range of overlay welding is wide relatively, residual stress distribution on PWR is affected by welding sequence. In order to examine the effect of welding sequence, PWOL was applied to a specific DMW of KORI nuclear power plant by finite element analysis method. As a result, the welding direction that from nozzle to pipe is better good for residual stress distribution on PWR.
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Nano-indentation 실험과 유한요소 해석을 연계한 재료의 탄소성 물성 평가법 개발
김윤재(Y.J Kim),송태광(T.K Song),박준협(J-H Park),한준희(J-H Hahn) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
Determination of elastic properties of nano-scale materials using nano-indentation tests is well established, but that of plastic properties is not yet clear. This paper presents a method to extract plastic properties from nano-indentation test, together with results from detailed elastic-plastic FE analysis. It shows that the plastic properties determined from this method are not unique, in the sense that a number of different plastic properties can give the same load-displacement response from nano-indentation test. Possible ways to overcome such problems are discussed.
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