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응력 특이점을 갖는 필릿 용접구조물의 피로해석을 위한 가상절점법을 이용한 구조응력 계산 기법 고찰
하청인,강성원,김명현,김만수,손상용,허주호,Ha Chung-In,Kang Sung-Won,Kim Myung-Hyun,Kim Man-Soo,Sohn Sang-Yong,Heo Joo-Ho 대한용접접합학회 2006 대한용접·접합학회지 Vol.24 No.3
Structural stress approach is well known as a mesh-size insensitive fatigue assessment method by using finite element analyses. It is, however, difficult to estimate the structural stress (SS) at weld end points due to stress singularities when shell elements are used. In this study, fatigue evaluations with longitudinal load carrying box fillet weldment under out-of-plane bending load have been performed by using virtual node method (VNM) in order to avoid the problem, which is called the weld end effect. Various combinations of virtual node parameters, such as reference point and virtual node locations, are investigated for the estimation of proper structural stress values applying VNM in a systematic manner. The appropriate guidance of virtual node parameter has been offered for the fillet weldment considered in the study. The structural stress values obtained by VNM have also been validated by comparing the result with finite element model including weld bead. Moreover, the fatigue strength of the fillet weldment based on the equivalent structural stress is shown to be consistent with the master S-N curve.
전석희(Seock-Hee Jun),황외주(Oe-Ju Hwang),강중규(Joong-Kyoo Kang),허주호(Joo-Ho Heo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
A very large semi-submersible drilling unit has been designed and fabricated in DSME shipyard. In mid-2004 year, it has been delivered to Gulf of Mexico. After its topside module integration and commissioning are completed, the unit is operated for oil and gas production during 25 years at Thunder Horse field. In this study, hydrodynamic analysis, load response analysis and global strength analysis using DNV SESAM program were performed for structural safety verification of the unit under 100-year extreme condition. Using stochastic approach and design wave method, critical design waves were selected in accordance with nine critical load responses. Quasi-static global strength assessment was carried out for a beam structure model and a shell structure model, respectively. The analysis results show the safe stress levels within the allowable stress limit in view of yielding and buckling criteria. Compared with analysis results given by other engineering company, the results show a good agreement.