SIMULATION OF THE IN-PILE BEHAVIORS EVOLUTION IN NUCLEAR FUEL RODS WITH THE IRRADIATION DAMAGE EFFECTS  

作　　者：Xin Gong Yijie Jiang Shurong Ding Yongzhong Huo Canglong Wang Lei Yang 

机构地区：[1]Department of Mechanics and Engineering Science, Fudan University [2]Institute of Modern Physics, Chinese Academy of Sciences

出　　处：《Acta Mechanica Solida Sinica》2014年第6期551-567,共17页固体力学学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11172068,91226101,11072062 and91026005);the Research Fund for the Doctoral Program of Higher Education of China(No.20110071110013);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA01020304)

摘　　要：Based on the commercial computational software, a three-dimensional finite ele- ment model to simulate the thermo-mechanical behaviors in a nuclear fuel rod is established; By taking into consideration irradiation-swelling of the pellet and the irradiation damage effects in the cladding together with the coupling effects between the temperature field and the mechanical field, the user subroutines to define the special material performance and boundary conditions have been developed independently and validated. Three-dimensional numerical simulation of the thermo-mechanical coupling behaviors in a nuclear fuel rod is carried out, and the evolution rules of the important thermal and mechanical variables are obtained and analyzed. The research re- sults indicate that： （i） the fuel pellets will be in contact with the cladding at high burnup, which will induce a strong mechanical interaction between them; （2） the irradiation creep effect plays an important role in the mechanical behavior evolution in the nuclear fuel rod.Based on the commercial computational software, a three-dimensional finite ele- ment model to simulate the thermo-mechanical behaviors in a nuclear fuel rod is established; By taking into consideration irradiation-swelling of the pellet and the irradiation damage effects in the cladding together with the coupling effects between the temperature field and the mechanical field, the user subroutines to define the special material performance and boundary conditions have been developed independently and validated. Three-dimensional numerical simulation of the thermo-mechanical coupling behaviors in a nuclear fuel rod is carried out, and the evolution rules of the important thermal and mechanical variables are obtained and analyzed. The research re- sults indicate that： （i） the fuel pellets will be in contact with the cladding at high burnup, which will induce a strong mechanical interaction between them; （2） the irradiation creep effect plays an important role in the mechanical behavior evolution in the nuclear fuel rod.

关 键 词：irradiation hardening irradiation creep LARGE-DEFORMATION thermo-mechanicalcoupling FEM 

分 类 号：TL352[核科学技术—核技术及应用]