Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Parametric study on stress distribution of thin disk specimen of rupture disk corrosion test influencing SCC initiation using finite element analysis

  • Tae Young Kim (Material Safety Technology Research Division, Korea Atomic Energy Research Institute) ;
  • Sung Woo Kim (Material Safety Technology Research Division, Korea Atomic Energy Research Institute) ;
  • Dong Jim Kim (Material Safety Technology Research Division, Korea Atomic Energy Research Institute) ;
  • Sang Tae Kim (Department of Nuclear Engineering, Hanyang University)
  • Received : 2023.09.20
  • Accepted : 2024.03.14
  • Published : 2024.08.25
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Abstract

Rupture disk corrosion test (RDCT) method has been recently developed for real-time measurement of initiation of stress corrosion cracking (SCC) in a high-temperature water. This work presents a parametric study on the stress distribution of a thin disk specimen of RDCT to consider the fixture shape and friction using finite element analysis (FEA). The FEA results showed a dome-shaped deformation of the specimen. From the stress analysis as a function of friction coefficient, it was suggested that the maximum stress was applied around the dome-edge, which was invariant with change to the friction coefficient. This indicates that friction between the fixture and the specimen has little effect on stress distribution. On the other hand, the stress analysis as a function of a rounded-corner radius (Rc) revealed the location at which the maximum stress was applied shifted from the dome edge to the dome center as Rc increased. From SCC initiation tests using the RDCT apparatus in a primary water environment, it was found that SCC initiates at the dome edge when Rc is 0.5 mm, while SCC initiates near the disk center when Rc is 2.0 mm. This experimental result is in good agreement with the results of FEA.

Keywords

Acknowledgement

This research was supported by the Korean Nuclear R&D Program (2021M2E4A1037979) through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, and partially funded by the Korean R&D program (RS-2022-00143718).

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