Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Three-dimensional numerical simulation of hydrogen-induced multi-field coupling behavior in cracked zircaloy cladding tubes

  • Xia, Zhongjia (Institute of Mechanics and Computational Engineering, Department of Aeronautics and Astronautics, Fudan University) ;
  • Wang, Bingzhong (Institute of Mechanics and Computational Engineering, Department of Aeronautics and Astronautics, Fudan University) ;
  • Zhang, Jingyu (Institute of Mechanics and Computational Engineering, Department of Aeronautics and Astronautics, Fudan University) ;
  • Ding, Shurong (Institute of Mechanics and Computational Engineering, Department of Aeronautics and Astronautics, Fudan University) ;
  • Chen, Liang (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institution of China) ;
  • Pang, Hua (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institution of China) ;
  • Song, Xiaoming (Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institution of China)
  • Received : 2018.07.15
  • Accepted : 2018.09.25
  • Published : 2019.02.25
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Abstract

In the high-temperature and high-pressure irradiation environments, the multi-field coupling processes of hydrogen diffusion, hydride precipitation and mechanical deformation in Zircaloy cladding tubes occur. To simulate this hydrogen-induced complex behavior, a multi-field coupling method is developed, with the irradiation hardening effects and hydride-precipitation-induced expansion and hardening effects involved in the mechanical constitutive relation. The out-pile tests for a cracked cladding tube after irradiation are simulated, and the numerical results of the multi-fields at different temperatures are obtained and analyzed. The results indicate that: (1) the hydrostatic stress gradient is the fundamental factor to activate the hydrogen-induced multi-field coupling behavior excluding the temperature gradient; (2) in the local crack-tip region, hydrides will precipitate faster at the considered higher temperatures, which can be fundamentally attributed to the sensitivity of TSSP and hydrogen diffusion coefficient to temperature. The mechanism is partly explained for the enlarged velocity values of delayed hydride cracking (DHC) at high temperatures before crack arrest. This work lays a foundation for the future research on DHC.

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References

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