Finite Element Simulation for Equivalent Elastic Properties of Dispersion Fuel Elements
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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。Abstract: The safety and reliability of the dispersion fuel elements in the reactors are the focus of relative 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 investigated in details.As the particles are distributed randomly,the numerical results are compared with several analytical equations,and the comparison indicates that the Mori-Tanaka model provides the best agreement with the FEM data.
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