A new method to simulate the micro-thermo-mechanical behaviors evolution in dispersion nuclear fuel elements |
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| Affiliation: | 1. Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China;2. Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institution of China, Chengdu 610041, Sichuan, China;1. Shaanxi Key Lab. of Advanced Nuclear Energy and Technology, School of Nuclear Science and Technology, Xi''an Jiaotong University, Xi''an 710049, China;2. Key Laboratory of Nuclear Reactor System Design and Technology, Nuclear Power Institute of China, Chengdu 610213, China;1. Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology, Shaanxi Engineering Research Center of Advanced Nuclear Energy, Xi''an Jiaotong University, Xi''an City 710049, China;2. China Nuclear Power Technology Research Institute Co., Ltd., China |
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| Abstract: | The large-deformation constitutive relations and stress update algorithms in a co-rotational framework are formulated respectively for the fuel particles, the matrix and cladding in dispersion nuclear fuel elements undergoing irradiation, with the main irradiation-induced effects within them considered. Their specific consistent tangent stiffness moduli are also developed. Correspondingly, the user subroutines UMAT have been programmed for definition of their mechanical constitutive relations. Besides, the user subroutines UMATHT have been written to define their thermal constitutive relations, in which degradation of the thermal conductivity of fuel particles are involved. An efficient method is established for modeling the irradiation-induced micro-thermo-mechanical behaviors evolution in dispersion nuclear fuel elements. The developed methodology is validated with the simulation results of the thermo-mechanical behaviors in fuel elements under an assumed irradiation condition. This study lays a foundation for optimal design of dispersion fuel elements. |
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| Keywords: | Dispersion nuclear fuel element Incremental constitutive relations Stress update algorithm Irradiation effect UMAT UMATHT |
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