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刊名：Journal of the Technical Association of Refractories, Japan

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出版年：2012-04-01

卷：32

期：1

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语种：英文

关键词：Mesoscale Analysis, Finite Element Method, X-ray CT Image. Compression Softening Behavior. Micro-cracking

内容简介

Effect of microstructure on the deformation and fracture mode of the monolithic caslable refractories was investigated to understand their mechanical behavior from both experimental and analytical points of view. Mesoscale FEM. finite element method, was applied for the analytical work. X-ray CT images of the castable refractories were processed to obtain the 2-dimensional mesoscale FEM model which consists of aggregates, matrix, interfacial transition zone and pores. Using the model, the analysis was carried out on stressing with both compression and bending in consideration of fracture due to the stress exerting in both matrix and interfacial transition zone. In the analysis of compression, macroscopic softening behavior has been observed in the material containing aggregates with accordance to the experimental result. It was clarified by the analysis that the macroscopic softening was originated by micro-cracking occurred numerously in the mesoscale structure. Furthermore, from both analyses in compression and bending, it was resulted that strength of the material containing aggregates was considerably lower than that without them. These analytical results agreed well to those from experimental work.