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首页> 外文期刊>Fusion Science and Technology >EXPERIMENTAL & NUMERICAL STUDY OF CERAMIC BREEDER PEBBLE BED THERMAL DEFORMATION BEHAVIOR
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EXPERIMENTAL & NUMERICAL STUDY OF CERAMIC BREEDER PEBBLE BED THERMAL DEFORMATION BEHAVIOR

机译：陶瓷育雏器卵石床热变形行为的实验与数值研究

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摘要

Experiments on thermomechanics interactions between clad and pebble beds have been performed with overstoichiometric lithium orthosilicate pebbles (pebble diameters between 0.25 and 0.63 mm) at temperatures of 700-800℃. The experimental results show that the thermal deformation of our pebble bed system is nonlinear and when the operating temperature is higher than 600℃, thermal creep deformation is generated. In this paper, constitutive equations of the elastic and creep deformation are derived from the experimental results. Incorporating the effective constitutive equations infinite element method (FEM), numerical investigations presenting the elastic and plastic deformation characteristics of pebble bed system are comparable to the experimental behaviors. In addition, discrete element method (DEM) is underdevelopment to derive constitutive equations for different pebble beds. The preliminary results of DEM show the stress distribution inside the pebble beds at steady or transient states, which helps us to identify the destructive region in a pebble bed system.
机译：用化学计量过高的原硅酸锂小卵石（小卵石直径在0.25和0.63 mm之间）在700-800℃的温度下进行了包层与卵石床之间热力学相互作用的实验。实验结果表明，我们的卵石床系统的热变形是非线性的，当工作温度高于600℃时，会产生热蠕变变形。本文从实验结果导出了弹性变形和蠕变变形的本构方程。结合有效的本构方程无限元方法（FEM），数值研究表明卵石床系统的弹性和塑性变形特性与实验性能相当。另外，离散元法（DEM）尚待开发，以推导不同卵石床的本构方程。 DEM的初步结果显示出卵石床内部在稳态或瞬态状态下的应力分布，这有助于我们识别卵石床系统中的破坏性区域。

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