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전윤배(Yun Bae Chun),안중혁(Joong-Hyok An),박준협(Jun-Hyub Park),김윤재(Yun-Jae Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, fatigue tests were performed for NiCo which is widely used in MEMS devices. Mechanical properties of thin film are important for design the mechanical structure and components. Mechanical properties of thin film are not same as those for bulk materials. Therefore, the production of thin film and the experiment is needed. The width of specimen is 50, 100, 150 ㎛. In the fatigue test of thin film, it is difficult to perform the fatigue test at R=-1. However, the result of the fatigue test at R=-1 should be required when fatigue life prediction is performed. Therefore, in this study, the modified Goodman method, Gerber method and Soderberg methods were be considered to investigate which method is most reasonable when mean stress is considered.
고리 원전 가압기 노즐 용접부 잔류응력 예측 시 안전단 고려가 이종 금속 용접부 잔류응력 분포에 미치는 영향
송태광(Tae-Kwang Song),배홍열(Hong-Yeol Bae),전윤배(Yun-Bae Chun),오창영(Chang-Young Oh),김윤재(Yun-Jae Kim),이경수(Kyoung-Soo Lee),박치용(Chi-Yong Park) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.8
In nuclear power plants, ferritic low alloy steel nozzle was connected with austenitic stainless steel piping system through alloy 82/182 butt weld. Accurate estimation of residual stress for weldment is important in the sense that alloy 82/182 is susceptible to stress corrosion cracking. There are many results which predict residual stress distribution for alloy 82/182 weld between nozzle and pipe. However, nozzle and piping system usually connected through safe end which has short length. In this paper, residual stress distribution for pressurizer nozzle of Kori nuclear power plant was predicted using FE analysis, which consideded safe end. As a result, existing residual stress profile was redistributed and residual stress of inner surface was decreased specially. It means that safe end should be considered to reduce conservatism when estimating the piping system.
예방 용접 Overlay 가 원전 가압기 이종금속용접부 잔류응력 완화에 미치는 영향
송태광(Tae-Kwang Song),배홍열(Hong-Yeol Bae),전윤배(Yun-Bae Chun),오창영(Chang-Young Oh),김윤재(Yun-Jae Kim),이경수(Kyoung-Soo Lee),박치용(Chi-Yong Park) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.10
Weld overlay is one of the residual stress mitigation methods which arrest crack initiation and crack growth. Therefore weld overlay can be applied to the region where cracking is likely to be. An overlay weld used in this manner is termed a preemptive weld overlay(PWOL). In pressurized water reactor(PWR) dissimilar metal weld is susceptible region for primary water stress corrosion cracking(PWSCC). In order to examine the effect of PWOL on residual stress mitigation, PWOL was applied to a specific dissimilar metal weld of Kori nuclear power plant by finite element analysis method. As a result, strong compressive residual stress was made in PWSCC susceptible region and PWOL was proved effective preemptive repair method for weldment.
예방 용접 overlay가 밀림관 노즐 보수 용접부 잔류응력에 미치는 영향
오창영(Chang-Young Oh),송태광(Tae-Kwang Song),배홍열(Hong-Yeol Bae),전윤배(Yun-Bae Chun),김윤재(Yun-Jae Kim),이경수(Kyoung-Soo Lee),박치용(Chi-Yong Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In the welding process, weldments usually include repair weld during the manufacturing process. Repair welds is supposed to cause strong tensile residual stress. Moreover weldments, usually made by Alloy 82/182, is susceptible to PWSCC. Therefore, mitigation of welding residual stress in weldments is important for reliable operating. PWOL is one of the methods for mitigation and verified for over twenty years. In this paper, residual stress distribution of repaired weldments and the effect of PWOL on mitigation is examined for surge nozzle.