Micro-CT technique poses significant applications in characterizing the microstructure of materials. Based on the CT three-dimensional(3D) reconstruction technology and "Avizo" 3D visualization software, the microscopic pore-throat structure of porous media can be quantitatively characterized. This paper takes the carbon fiber reinforced resin matrix composites as an example to introduce the operation process of "Avizo" in details, which mainly covers the following modules: Volume Edit, Interactive Thresholding, Fill Holes, Mask, Separate Objects and Generate Pore Network Model, then further discuss the difficult problems when the "Avizo" is employed to analyze. The microstructures of carbon fiber reinforced resin matrix composites illustrate that pores in the upper part of sample are dramatically dispersed, and mainly concentrated in the lower part of sample. The porosity of adopted cuboid is 3.6%, accordingly the numbers of pores and throats reach 268 and 7, respectively. The equivalent radius of pores seems mainly distributed in the range of 0.7-0.8μm, accounting for 28.73% of the total pore number. The surface area of pore ranges from 5 to 10μm2, accounting for 14.16% of the total pore number. The pore volume concentrates in the range of 1-20μm3, accounting for 57.46% of the total pore number. In addition, the equivalent radius of throat mainly concentrates in the range of 1-5μm, the overall length of throat is distributed in the range of 37-60μm, and the equivalent area of throat is distributed non-uniformly in the range of 5-75μm2. This work provides a basis for the further investigation of fluid migration mechanism and law in the composite materials by the numerical simulation methodology.

中文翻译：

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碳纤维增强树脂基复合材料的孔喉结构表征：采用 Micro-CT 和 Avizo 技术。

Micro-CT 技术在表征材料的微观结构方面具有重要应用。基于CT三维（3D）重建技术和“Avizo”3D可视化软件，可以定量表征多孔介质的微观孔喉结构。本文以碳纤维增强树脂基复合材料为例，详细介绍“Avizo”的操作流程，主要涵盖以下模块：体积编辑、交互阈值、填充孔洞、蒙版、分离对象和生成孔隙网络模型，然后进一步讨论使用“Avizo”进行分析时的难点问题。碳纤维增强树脂基复合材料的微观结构表明，样品上部的孔隙显着分散，且主要集中在样品的下部。所采用的长方体孔隙率为3.6%，相应的孔隙和喉道数量分别达到268个和7个。孔隙等效半径似乎主要分布在0.7-0.8μm范围内，占总孔隙数的28.73%。孔隙表面积为5～10μm2，占总孔隙数的14.16%。孔体积集中在1-20μm3范围内，占总孔数的57.46%。此外，喉道等效半径主要集中在1-5μm范围内，喉道全长分布在37-60μm范围内，喉道等效面积在5-5μm范围内分布不均匀。 75μm2。