原子能科学技术2018，Vol.52Issue(6)：1056-1062,7.DOI:10.7538/yzk.2018.52.06.1056
含裂纹锆合金包壳管氢致多场耦合行为的数值模拟研究
Numerical Simulation on Hydrogen-diffusion-induced Multi-field Coupling Behavior in Zircaloy Cladding Tube with Crack
摘要
Abstract
With the stress-reorientation of hydrides considered,the theoretical models were given for the hydrogen-diffusion-induced multi-field coupling behaviors in zircaloy cladding tubes.The corresponding multi-field coupling computational methods were developed and the finite element procedures were obtained.For an axially-cracked clad-ding tube subjected to internal pressures,the finite element model was established to calculate and analyze the hydrogen-diffusion-induced multi-field coupling behaviors.T he research results indicate that for a cracked cladding tube initially containing plenty of hydrogen atoms in solid solution,only considerable amount of hydrides precipitate around the crack tip,which mainly results from the high hydrostatic stress gradients and concentration gradients of hydrogen in solid solution there,together with lower terminal solid solubility ;The majority of hydrides at the crack tip precipitate along the radial orientation,which will induce occurrence of radial cracking of cladding tubes to threaten their safety ;After applying the internal pressures,due to the expansion strains induced by hydride precipitation,the hoop stress,the radial stress,the hydrostatic stress and its gradient will decrease with time,which results in a lower velocity of hydride precipitation.关键词
含裂纹锆合金包壳管/氢化物应力再取向/氢致多场耦合行为/有限元计算/径向开裂Key words
zircaloy cladding tube with crack/stress-reorientation of hydride/hydro-gen-diffusion-induced multi-field coupling behavior/finite element computation/radial cracking分类
能源科技引用本文复制引用
夏仲佳,张靖宇,丁淑蓉..含裂纹锆合金包壳管氢致多场耦合行为的数值模拟研究[J].原子能科学技术,2018,52(6):1056-1062,7.基金项目
国家自然科学基金资助项目(11772095,11572091) （11772095,11572091）
国家重点研发计划资助项目(2016YFB0700103) （2016YFB0700103）
