气泡相互作用对燃料颗粒应力分布的影响  

Effect on Stress Distribution of Fuel Particle Under Interaction of Bubbles

作　　者：赵毅[1] 王晓敏[1] 龙冲生[1] 

机构地区：[1]中国核动力研究设计院反应堆燃料及材料重点实验室,四川成都610041

出　　处：《原子能科学技术》2014年第5期877-882,共6页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(91226114)

摘　　要：本工作建立了受气泡内压作用的双气泡UO2模型,利用有限元方法得到燃料颗粒受气泡内压作用、不同气泡间距条件下的燃料颗粒应力分布结果,并讨论了气泡间距、气泡半径和气泡内压对气泡之间相互作用的影响。研究结果表明,受气泡相互作用的影响,燃料颗粒内部产生了应力集中,应力集中倍率与气泡间距和气泡半径的比值(距径比)有关,与气泡内压无关。当距径比等于1时,应力集中倍率约为未考虑气泡相互作用影响时的2倍。当气泡尺寸不同时,应力集中主要发生在靠近小气泡的燃料基体处。The UO2 dual bubbles model under bubble internal pressure was proposed , and the stress distribution of fuel particles under different intra-bubble distances was calculated by using the finite element method . T he effects of intra-bubble distance , bubble radius and bubble internal pressure on the interaction of bubbles were discussed . T he results show that w hen the interaction of bubbles is considered , stress concentration occurs and locates at the fuel particles between bubbles .The rate of stress concentration is related to the ratio of intra-bubble spacing to bubble radius （spacing radius ratio ,SRR） but unrelated to the bubble internal pressure .When SRR equals 1 , the stress concentration rate is about twice that when the interactions of bubbles are ignored . When the sizes of bubbles are different , the stress concentration occurs primarily at the fuel near the small bubbles .

关 键 词：弥散型燃料 UO2 燃料颗粒 气泡相互作用 应力集中 

分 类 号：TL211.1[核科学技术—核燃料循环与材料]