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首页> 外文期刊>Nuclear Technology >Finite Element Modeling Of Thermal-mechanical Behaviors Of Dispersion Fuel Elements
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Finite Element Modeling Of Thermal-mechanical Behaviors Of Dispersion Fuel Elements

机译：分散燃料元件热力学行为的有限元建模

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摘要

A metal-matrix dispersion fuel plate is considered. Taking account of the actual geometry, a special three-dimensional representative volume element is developed according to the particle distributions, which might characterize not only the macro deformation along the thickness but also the micro stress-strain fields. An elastoplastic analysis using the finite element method is carried out for the thermal-mechanical behaviors induced only by the thermal effects. The distributions of the thermal stresses at the fuel particles and the matrix are given, and the effects of the surface heat transfer coefficients, the heat generation rates of the fuel particles, and the degraded conductivities of the fuel particles along with the burnup on the stresses and the size variations of the plate thickness are investigated. The research results indicate that the internal stress distributions are not spherically symmetrical. With increasing surface heat transfer coefficients, the first principal stresses at the particles and the matrix both fall, and the thickness increments decrease. The first principal stresses at the fuel particles and the matrix both grow with increasing heat generation rates, and the thickness variations linearly increase. With decrease of the thermal conductivities of the fuel particles, the first principal stresses at the matrix increase, and the relative stresses at the particles decrease.
机译：考虑金属基质分散燃料板。考虑到实际的几何形状，根据颗粒的分布，开发了特殊的三维代表性体元，它不仅可以表征沿厚度的宏观变形，还可以表征微应力-应变场。对于仅由热效应引起的热力学行为，使用有限元方法进行了弹塑性分析。给出了燃料颗粒和基体处的热应力分布，以及表面传热系数，燃料颗粒的发热量，燃料颗粒的电导率下降以及燃耗对应力的影响。并研究了板厚的尺寸变化。研究结果表明，内部应力分布不是球形对称的。随着表面传热系数的增加，颗粒和基体上的第一主应力均下降，并且厚度增量减小。燃料颗粒和基体处的第一主应力都随着热量产生速率的增加而增长，并且厚度变化线性增加。随着燃料颗粒的热导率的降低，基体处的第一主应力增加，而颗粒处的相对应力减小。

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