Characterization of pore structure is one of the key problems for fabrication and application research on porous materials. But, complexity of pore structure makes it difficult to characterize pore structure by Euclidean geometry and traditional experimental methods. Fractal theory has been proved effective to characterize the complex pore structure. The box dimension method based on fractal theory was applied to characterizing the pore structure of fiber porous materials by analyzing the electronic scanning microscope (SEM) images of the porous materials in this paper. The influences of image resolution, threshold value, and image magnification on fractal analysis were investigated. The results indicate that such factors greatly affect fractal analysis process and results. The appropriate magnification threshold and fractal analysis are necessary for fractal analysis. porous materials, fractal dimension, porous structure Citation: Tang H P, Zhu J L, Xi Z P, et al. Impact factors of fractal analysis of porous structure.Pore structure is one of the most important factors for applied performance of porous materials. Many behaviors of porous materials, such as sound absorption, diffusion, permeability and mechanical properties, depend on the pore structure. Therefore, describing the pore structure properties of porous materials is a worldwide topic. Large number of studies show that porous materials have typical fractal features [1]. It is feasible to investigate pore structure and the relationship between performances and characters of pore structure by fractal theory. The accuracy of fractal analysis depends on the fractal object selected and fractal analysis process. There are many factors which may influence the analysis process for the fractal analysis method based on two-dimensional digital images, such as methods to obtain binary images, image resolution, image magnification, and threshold value. Each factor may lead to inaccurate calculation of the fractal dimension. Therefore, it is necessary to investigate the influence factors on fractal analysis process. Fractal box dimensions were calculated in this paper, and the influences of image resolution, threshold value, and image magnification on fractal analysis were investigated.
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