Research On Microscopic Feature Analysis And Measurement Of Material Property Of Porous Media By Image

Porous media is a new engineering material with high performance. Its microstructure is one of the key factors which affect macro material property and performance. The description of microstructure of porous media and its connection with material property have always been the focus and difficulty in the field of materials science and engineering. However, Most commercial software and equipments don't have material parameters measurement function. The studies as follow:Firstly, the current measurement methods of microstructure have been analyzed and compared. Then the author of this paper uses image algorithms to measure micro-structure parameters, and applies fractal to describe micro-features of porous media, and establish the connection between material property and micro features.The author of this paper analyzes and compares iterative method, recursive method, and presents a new backtracking algorithm to mark the pore regions based on the scanning electron microscope. Then microstructure parameters such as area of pore, the perimeter of pore and porosity are measured.Five kinds of methods are adopted to compute fractal dimension. The measuring data are processed and analyzed so as to choose a suitable method. Box-counting method is chosen in the fractal dimension computation of porous media, and then the pore area fractal dimensions are determined by this method.Fractal model of permeability is presented based on the world progress. The permeability parameter of porous media can be predicted by using the microstructure parameters, pore area fractal dimension and tortuosity fractal dimension. The computed result agrees well with the experimental data.In this paper, fractal theory and image processing are combined to realize measurement of porous media.