Abstract
Transport containers for radioactive materials should withstand drop tests according to the regulations. In order to prevent a loss or dispersal of the internal radioactive materials in the drop tests, a tightening of the lid of the transport container should be maintained. The opening of the lid, due to the drop impact, might cause the dispersion of internal contents or a loss of shielding performance. Thus, it is crucial to predict damage to the fastening bolt and its fracture. In this study, the damage parameters of the fastening bolt were acquired, and its fracture was predicted using the generalized incremental stress state-dependent damage model (GISSMO), a phenomenological damage model. Since the dedicated transport container is large and heavy, various jigs that can simulate the fall of the container were designed, and the accuracy of fracture prediction was verified. Digital image correlation (DIC) was introduced for the accurate measurement of the displacement, and load–displacement data for tensile, shear, and combined loads were successfully acquired. Finally, the load–displacement curve of the finite element analysis (FEA) with GISSMO until the point of the bolt fracture was compared with the curve obtained from the experiment, where a good agreement was observed.
Highlights
In order to prevent radiation exposures during transportation, radioactive materials should be transported in a transport container that satisfies the regulations [1,2]
Radioactive waste transport containers are made of metals, and the upper and lower parts of them are fastened with bolts to prevent the dispersion of radioactive waste to the outside (Figure 1)
The measurements were compared with the load–displacement curve obtained through finite element analysis (FEA) until the bolt fractured to verify the reliability of the generalized incremental stress state-dependent damage model (GISSMO) parameters
Summary
In order to prevent radiation exposures during transportation, radioactive materials should be transported in a transport container that satisfies the regulations [1,2]. In this study, the fracture of the bolts used for radioactive waste transport containers was predicted using the generalized incremental stress state-dependent damage model (GISSMO), one of the damage models. Jigs that can reach the stress state at the moment when the bolt fractures due to the drop of the transport container were designed to simulate the situation, and this was used to verify the accuracy of the fracture prediction. At this time, the digital image correlation (DIC) measurement method was introduced to measure the accurate displacement of the jig. The measurements were compared with the load–displacement curve obtained through finite element analysis (FEA) until the bolt fractured to verify the reliability of the GISSMO parameters
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