Investigating the mechanical behaviour of Fukushima MCCI using synchrotron Xray tomography and digital volume correlation
Investigating the mechanical behaviour of Fukushima MCCI using synchrotron Xray tomography and digital volume correlation
复制标题
DOI：
10.1038/s41529-022-00264-y
复制
发表时间：
2022-07
影响因子：
5.1
通讯作者：
C. Paraskevoulakos;J. P. Forna-Kreutzer;K. Hallam;Christopher P. Jones;T. Scott;C. Gausse;Dong Liu;C. Reinhard;C. Corkhill;M. Mostafavi
中科院分区：
文献类型：
--
作者：
C. Paraskevoulakos;J. P. Forna-Kreutzer;K. Hallam;Christopher P. Jones;T. Scott;C. Gausse;Dong Liu;C. Reinhard;C. Corkhill;M. Mostafavi
福岛灾难清理工作的一个主要目标是回收熔化的核心-混凝土相互作用（MCCI）产品，这些产品目前位于受损的1-3号核反应堆的地下室。MCCI是一种材料的融合，由核燃料包壳和邻近的结构部件组成。确定目前未知的MCCI的物理和机械特性对于成功和及时的检索至关重要。在本文中，我们的目的是通过实验量化一种类似于MCCI的材料的力学性能。采用赫兹压痕逐步加载法对具有代表性的小尺寸试样进行了力学试验。在不同的加载阶段进行了同步加速器x射线计算机断层扫描，以揭示样品的微观结构和力学退化。通过数字体积相关分析获得的层析图，以测量样品体积内的全场位移和应变。杨氏模量和泊松比通过这种联合方法确定。
A primary target towards the clean-up operation of the Fukushima disaster is the retrieval of Molten Core-Concrete Interaction (MCCI) products, presently residing on the basement of the damaged nuclear reactor Units 1–3. MCCI is a fusion of materials, composed of both nuclear fuel cladding and neighbouring structural components. Determining the currently unknown, physical and mechanical properties of MCCI is essential for successful and timely retrieval. In this paper, we aim to experimentally quantify the mechanical properties of a material fabricated to resemble MCCI. A small-scale representative specimen was mechanically tested using Hertzian indentation stepwise loading. Synchrotron X-ray computed tomography was conducted at several loading stages to reveal the sample microstructure and mechanical degradation. The acquired tomograms were analysed by digital volume correlation to measure full-field displacements and strains developed within the sample volume. Young’s modulus and Poisson ratio were determined via this combined methodology.