多气泡对燃料颗粒应力分布的影响研究  

Effect Study of Multi-bubbles on Stress Distribution of Fuel Particle

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》2015年第1期121-125,共5页Atomic Energy Science and Technology

基　　金：国家自然科学基金资助项目(91226114)

摘　　要：利用有限元模拟方法建立了UO2弥散型燃料颗粒受内部多个气泡内压作用的模型,计算得到了燃料颗粒内部存在多个气泡时的应力分布结果。结果表明,当气泡沿x轴均匀排列时,y方向的最大正应力随气泡数量的增多而增大,且增大幅度逐渐减小,气泡对燃料颗粒内部最大正应力的影响存在极限;当存在多行气泡时,燃料颗粒内部x方向的最大正应力随气泡行数的增加而增大,y方向的最大正应力随气泡行数的增加而减小;气泡造成的燃料颗粒内部的应力集中效应随距径比的增大而减小。The finite element model was proposed to simulate the process of the UO 2 dis‐persion fuel particle sustaining the internal pressure of multi‐bubbles ,and the stress distribution of fuel particle with intra‐bubbles was calculated .The results show that when the bubbles line equidistantly along x axis ,the max normal stress along y axis increases with the number of bubbles ,meanwhile ,the increment of the normal stress gradually decreases .There is a limit that the effect of bubble’s number imposes on the max normal stress in the fuel particle .When multi‐column of bubbles exist ,the max normal stress along x axis in the fuel particle increases ,and the max normal stress along y axis decreases with the increase of the number of bubble column .The stress concen‐tration in the fuel particle decreases with the spacing radius ratio increasing .

关 键 词：弥散型燃料 UO2 燃料颗粒 多气泡 应力集中 

分 类 号：TL211.1[核科学技术—核燃料循环与材料]