摘要
弥散型核燃料元件在反应堆中的安全和可靠性与元件芯体的等效力学性能密切相关。本研究采用细观力学的方法,假设芯体中的燃料颗粒在基体中周期性排列,从中取出代表性体积元,运用有限元方法计算弥散型燃料在不同温度和颗粒体积含量下的等效弹性模量。分析比较了颗粒的体积含量和分布形式对弥散型燃料等效弹性性质的影响,并在颗粒随机排列时,将有限元计算结果和解析模型的结果进行了比较。结果表明,计算值和Mori-Tanaka模型的预测值最为接近。
The safety and reliability of the dispersion fuel elements in the reactors are the focus of rela-tive researches.They depend on the mechanical property of the fuel elements.In the present work,several representative volume elements are chosen from the fuel elements according to the arrangement styles of the fuel particles in the matrix and the finite element analysis is applied to study the effective elastic property of the fuel element.The effects of temperature and volume fraction of the fuel particles on the property are in-vestigated in details.As the particles are distributed randomly,the numerical results are compared with sev-eral analytical equations,and the comparison indicates that the Mori-Tanaka model provides the best agree-ment with the FEM data.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2011年第3期43-47,共5页
Nuclear Power Engineering
基金
国家自然科学基金(10672042
10772049)
国家高技术研究发展计划(863计划)(2009AA04Z408)
关键词
弥散型燃料
等效弹性系统
细观力学
有限元法
Dispersion fuel element
Effective elastic property
Micromechanics
Finite element analysis
