改良9Cr-1Mo鋼製円筒容器の耐震座屈評価法に関する研究

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  • Study on the seismic buckling evaluation method for Mod. 9Cr-1Mo steel cylindrical vessel

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<p>It is considered that the diameter of cylindrical vessels for demonstration or commercial FBR (Fast Breeder Reactor) power plant will become larger to increase electric generation capacity and the vessels will be thinner compared to the existing FBR plants. Furthermore, because of the horizontal seismic isolation due to increase of assumed seismic load, the cylindrical vessels will be subjected to relatively large and cyclic vertical seismic load with long-term horizontal seismic load. In addition to austenitic stainless steel used for the vessels in the existing FBR plants, modified 9Cr-1Mo steel, which has larger yield stress and lower stiffness after yielding, will be applied. Current JSME standard for buckling strength evaluation mainly focuses on plastic buckling of thick cylindrical vessels. Thus, new buckling strength evaluation method for thin walled cylindrical vessels which can consider (1) elastic (or elasto-plastic) axial, bending and shear buckling and their interaction, (2) decrease of buckling strength by axial cyclic load and (3) the material characteristics of modified 9Cr-1Mo steel. In this study, static buckling tests and FE analyses of cylindrical vessel made of modified 9Cr-1Mo steel were conducted to confirm the applicability of new buckling strength evaluation method and verify the accuracy of FE analyses. The test vessels were loaded with constant horizontal force and incremental vertical force considering actual seismic load in horizontal isolated plant. As a result, buckling strength evaluated by elasto-plastic buckling analysis had good accuracy compared to test results by considering stress - strain relationship and imperfection of test vessel.</p>

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