正硅酸锂卵石的尺寸相关压碎分析
Size dependent crush analysis of lithium orthosilicate pebbles
摘要：
研究了用于欧盟固体增殖堆概念的卵石形式的增殖堆材料（正硅酸锂、$\rm{Li_4SiO_4}$或OSi）的压碎强度。使用熔融喷涂方法制造卵石，因此预期所产生的卵石的尺寸变化。卵石的机械完整性（压碎强度）的知识对于成功设计增殖包层是重要的。本文给出了不同直径（从$250~μ$ m到$800~μ$ m）的球形硅氧石卵石的压碎（破坏）载荷的实验结果。每种尺寸的极限失效载荷均呈威布尔分布。此外，平均压碎载荷随着卵石直径的增加而增加。还观察到卵石的不透明度水平显著影响压碎载荷。本文提出的实验数据和相关的分析可能有助于我们开发一个框架，模拟一个可破碎的多分散卵石组件使用离散元方法。
英文摘要：
Crushing strength of the breeder materials (lithium orthosilicate, $\rm{Li_4SiO_4}$ or OSi) in the form of pebbles to be used for EU solid breeder concept is investigated. The pebbles are fabricated using a melt-spray method and hence a size variation in the pebbles produced is expected. The knowledge of the mechanical integrity (crush strength) of the pebbles is important for a successful design of breeder blanket. In this paper, we present the experimental results of the crush (failure) loads for spherical OSi pebbles of different diameters ranging from $250~μ$m to $800~μ$m. The ultimate failure load for each size shows a Weibull distribution. Furthermore, the mean crush load increases with increase in pebble diameter. It is also observed that the level of opacity of the pebble influences the crush load significantly. The experimental data presented in this paper and the associated analysis could possibly help us to develop a framework for simulating a crushable polydisperse pebble assembly using discrete element method.
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