Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2019, Vol. 30 ›› Issue (4): 65 doi: 10.1007/s41365-019-0586-2

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Creep damage characterization of UNS N10003 alloy based on a numerical simulation using the Norton creep law and Kachanov-Rabotnov creep damage model

Xiao-Yan Wang1,2 • Xiao Wang1 • Xiao-Chun Zhang1 • Shi-Feng Zhu1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2018-07-18 Revised:2018-09-20 Accepted:2018-10-01
  • Contact: Xiao Wang; Xiao-Chun Zhang E-mail:wangxiao@sinap.ac.cn; zhangxiaochun@sinap.ac.cn
  • Supported by:
    The work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDA02010000).
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Xiao-Yan Wang, Xiao Wang, Xiao-Chun Zhang, Shi-Feng Zhu. Creep damage characterization of UNS N10003 alloy based on a numerical simulation using the Norton creep law and Kachanov-Rabotnov creep damage model.Nuclear Science and Techniques, 2019, 30(4): 65     doi: 10.1007/s41365-019-0586-2
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Abstract: The calculation of inelastic creep damage is important for the structural integrity evaluation of the elevated temperature structure in a thorium molten salt reactor (TMSR). However, a creep damage theory model and numerical simulation method have not been proposed for the key materials (UNS N10003 alloy) in the TMSR. In this study, creep damage characterization of UNS N10003 alloy is investigated using the Norton creep law and Kachanov–Rabotnov (K–R) creep damage model. First, the creep experimental data of the UNS N10003 alloy at 650 C were adopted to fit the material constants of the two models. Then, the creep damage behavior of the UNS N10003 alloy was analyzed and discussed under uniaxial and multi-axial stress states. The results indicated that the K–R creep damage model is more suitable for the UNS N10003 alloy than the Norton model. Finally, the numerical simulation method was developed by a user-defined UMAT subroutine and subsequently verified through a finite element analysis (FEA). The FEA results were in agreement with the theoretical solutions. This study provides an effective method for the inelastic creep damage analysis of the elevated temperature structure in the TMSR.

Key words: Thorium molten salt reactor, UNS N10003 alloy, Creep damage, Inelastic analysis, Elevated temperature structure