多气泡对燃料颗粒应力分布的影响研究
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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 UO2 dispersion 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 xaxis,the max normal stress along yaxis 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 xaxis in the fuel particle increases,and the max normal stress along yaxis decreases with the increase of the number of bubble column.The stress concentration in the fuel particle decreases with the spacing radius ratio increasing.
The finite element model was proposed to simulate the process of the UO2 dispersion 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 xaxis,the max normal stress along yaxis 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 xaxis in the fuel particle increases,and the max normal stress along yaxis decreases with the increase of the number of bubble column.The stress concentration in the fuel particle decreases with the spacing radius ratio increasing.
引文
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[2]杨文斗.反应堆材料学[M].北京:原子能出版社,2006.
[3]REST J,HOFMAN G.DART model for irradiation induced swelling of uranium silicide dispersion fuel elements[J].Nuclear Technology,1999,126:88-101.
[4]邢忠虎,应诗浩.U3Si2-Al弥散型燃料的辐照肿胀研究[J].原子能科学技术,2001,35(1):15-19.XING Zhonghu,YING Shihao.Study on the irradiation swelling of U3Si2-Al dispersion fuel[J].Atomic Energy Science and Technology,2001,35(1):15-19(in Chinese).
[5]LEE V D.Evaluation of the mechanical behavior of a metal matrix dispersion fuel for plutonium burning[D].USA:Georgia Institute of Technology,2003.
[6]DING Shurong,JIANG Xin,HUO Yongzhong,et al.Reliability analysis of dispersion nuclear fuel elements[J].Journal of Nuclear Materials,2008,374:453-460.
[7]DING Shurong,HUO Yongzhong.Finite element modeling of thermal mechanical behaviors of dispersion fuel elements[J].Nuclear Technology,2008,163:416-425.
[8]赵毅,王晓敏,龙冲生.气泡相互作用对燃料颗粒应力分布的影响[J].原子能科学技术,2014,48(5):877-882.ZHAO Yi,WANG Xiaomin,LONG Chongsheng.Effect on the stress distribution of fuel particle under interaction of bubbles[J].Atomic Energy Science and Technology,2014,48(5):877-882(in Chinese).
[9]ROMANO A.Evolution of porosity in the highburnup fuel structure[J].Journal of Nuclear Materials,2007,361:62-68.
[10]李冠兴,武胜.核燃料[M].北京:化学工业出版社,2007.
[11]范钦珊,殷雅俊.材料力学[M].2版.北京:清华大学出版社,2008.