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1 방 밴드와 어댑터를 사용하여 구성한 겹완철 장주의 응력 및 피로해석
김완재(Wanjae Kim),이기철(Lee Kichul),황수천(Hwang Soo-chun),이건욱(Lee Gun-uk) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Power pole and its components mainly support and shift power cable and its direction to properly distribute electric power to the need. Power pole assembly includes such components as supporting pole, crossarms, bands for crossarms and insulators. Considerable portion of external force are to be applied to crossarms and bands which connect crossarms to the poles. One-directional bands, 1D bands, are used for single crossarms and two-directional bands, 2D bands, for double cross arms. In the case of replacing a single crossarm by double crossarms, a band also has to be changed to a 2D band. Since replacing bands require a lot of work, a suggestion which utilize adapters to install double bands without the replacement of bands is made. This paper compares the results of stress and fatigue analysis of double crossarms with 1D band and adapter and double crossarms with 2D bands by finite element analysis. Finally structural integrity of the two structures are evaluated and then compared.
김완재(Wanjae Kim),이경수(Kyoung-Soo Lee),김태룡(Tae-Ryong Kim),송태광(Tae-Kwang Song) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Distribution of welding residual stresses are mainly characterized by degrees and frequencies of thermal loads applied to materials. However, other effects as component size and clamping condition can also affect stress distributions to a certain extent thus careful manipulation of these parameters based on clear understanding of how they affect residual stresses distributions and why can be additional measure to mitigate residual stresses. This paper discusses aforementioned issues for the case of safety and relief nozzle in nuclear power plant through finite element analysis.
김완재(Wanjae Kim),박치용(Chi-yong Park),이경수(Kyoung-soo Lee),권종주(Jongjooh Kwon),김태룡(Tae-Ryoung Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, several sets of numerical calculation are performed to investigate geometric effects of main steam isolation valve components on valve’s structural integrity. In particular, stress distributions around valve’s stem neck are closely evaluated where a full scale rupture had occurred. Components of MSIV such as ring, stem, poppet are remodeled and stress calculation are followed to find major geometric effects from which stem neck rupture may have been initiated. Finally, Major geometric factors are indentified and their contribution to stress concentration are evaluated and then compared.
원전 주기기 피로평가 알고리즘 최적화를 위한 보수성 부여 방법론 연구
김완재(Wanjae Kim),권종주(Jong Jooh Kwon),정일석(Ill-Seok Jeong),김태룡(Tae Ryong Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
New fatigue usage calculation algorithms recently developed in KEPCO Research Institute are now in the process of computerization and scheduled to be delivered as software package named FEMS (fatigue evaluation and monitoring system) soon after program verification and validation. Algorithms are designed in such way that they can give accurate and optimized fatigue usage to estimate more realistic component life. In order for calculated usage to be reliable and applicable, usage factor should ranges between two values: one that is calculated using finite element method, likely to be accurate for most cases but computationally expensive and the other that is obtained with design transient conditions assumed, likely to be too conservative. More desirably, it is required for algorithm that it be able to control the level of conservatism of the result. Proposed method in this paper characterizes plant transient signals such as fluid temperature or internal pressure and calculates representative parameters that are then to be used as input values in fatigue life evaluation. With these critical parameters, level of conservatism in fatigue usage calculation results can become predictable thus desired level of conservatism can be obtained effectively.
김완재(Wanjae Kim),김건탁(Kuntak Kim),임세영(Seyoung Im) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Spiral seam welding pipes are manufactured in two consecutive processes: forming and welding. These processes are analyzed via finite element method to calculate the deformation and stress occurring from the two steps of manufacturing process. The ultimate goal is to find the effect of the plastic deformation resulting from the pipe forming on the residual stress.