Experimental analysis of thermal loading effect on buckling behaviour of FBR main vessel


Hong Zhao, Shaode Gu Key Laboratory of Solid Mechanics of MEC, Tongji University, Shanghai 200092, China


<正> China Experimental Fast Breeder Reactor (CEFBR) is a seat-type structure. During the working condition, the thin-walled cylinder shells will stand high temperature so that buckling may happen due to strong earthquakes. The buckling strength may be reduced by the change of σ0.2 (0.2% proof stress) and E(Young's modulus). In order to investigate the effect which caused by high temperature of liquid natrium in main vessel in the operation condition under seismic load, it is necessary to carry out a thermal simulation experiment to understand the buckling property of FBR. Based on experiment, we explore a way of approximate analysis of unstability about safty evaluation of main vessel. The results of experiment are compared with numerical calculation of finite element. A model of cylinder shell vessel is presented by using poly vinyl chloride (PVC), simulating liquid natrium by heat water. On the test platform horizontal load and moment of force were applied by screw jack in the model, we carry out shear-bent test under the condition of room temperature without water, room temperature with water, and the buckling loads are obtained. The buckling mode is studied by photomechanical measurement, in which moire is employed. The buckling experiments of the model shell are well done, and some constructive achievements are obtained. The experiment provides modelization and value mode for modeling of numerical calculation, and the reliability of numerical simulation was validated.


Thermal loads, buckling strength, buckling mode, stability property, photomechanical measurement


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