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Study on the Permeability of Fiber Aggregation by Fractal Theory

Author: LuZhenQian
Tutor: QianKun
School: Jiangnan University
Course: Textile Engineering
Keywords: Penetration Fractal Theory Fiber assembly Box-counting method
CLC: TQ327.1
Type: Master's thesis
Year: 2006
Downloads: 260
Quote: 5
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Abstract


In the composite molding process, such as RTM mold filling process, the permeability is an important parameter to describe the permeability of the mold filling process can be used to characterize the resin flowing through the degree of difficulty of the fiber aggregate. At the same time, the penetration is also important parameters for computer simulation of resin transfer contribute to the process design of fiber-reinforced composite materials. The infiltration performance of the resin to the fiber aggregate often determines the quality and production efficiency of the composite part. Therefore, in-depth study of the penetration rate of fiber assembly, to understand its impact factors, to do the design and control of these factors will play a huge role in promoting the wide range of industrial applications of RTM. In this paper, fractal theory study on permeability. Fractal theory and the seventies of the last century, mainly describes some very irregular objects, object analysis has unique advantages for irregular, disorderly. This study mainly includes the following aspects: (1) According to the structural characteristics of the fiber assembly as well as the basic theory of fractal geometry, verify that the pore structure of the fiber assembly line with the characteristics of fractal and fractal theory to study the pore structure. (2) use of the principle of box-counting method, the first cross-sectional image of the fiber assembly processing and VC 6.0 programming language for solving the fractal dimension of several fiber assembly. (3) According to the fractal capillary model and applying the Hagen-Poiseulle equation and Darcy theorem establish penetration fractal analysis model, permeability fractal analysis solution formula. And the actual value of the permeability of fiber assembly through experiments, compared with the theoretical value, and to verify the correctness of the penetration rate fractal model. Through analysis, concluded that: (1) in the fiber aggregate, including a macro-porosity and micro pores. The microstructure of these irregular pore size and pore distribution and beach as well as the distribution of islands and lakes on Earth is very similar, so we believe that the size and distribution of the pores in the fiber assembly had a fractal, fractal theory can also be applied to calculations. VC 6.0 programming language programming, according to the box-counting method, solving several fiber assembly fractal dimension. (2) According to the capillary fractal model, combined with Darcy's law, the penetration fractal model deduced by comparison with experimental data shows that the penetration of fractal model can predict the penetration. Compared with known Kozeny-Carman equation, eliminating the empirical constants. Therefore, the application of fractal theory and methods to study the penetration rate of fiber assembly is significantly better than the Kozeny-Carman equation. The last prospect of the future development direction of the subject.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Reinforced plastic,filled plastics > GRP ( glass reinforced plastic )
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