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Multiscale Modeling and Front Tracking for Chemical Vapor Inltration Process

Author: HuWenZuo
Tutor: YueXingYe
School: University of Science and Technology of China
Course: Computational Mathematics
Keywords: Ceramic matrix composites Chemical vapor infiltration process Different values ??multiscale method Level set method Fast scanning The velocity field extension
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 73
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Abstract


Preparation of Carbon Fiber Reinforced SiC ceramic matrix composites (C \\ SiC) chemical vapor infiltration (CVI process) is modeled as the main object of study , the use of mathematical modeling of multiscale modeling idea of the aperiodic structure materials CVI process to obtain the distribution of the residual porosity of the material in the statistical sense . Existing the CVI model fresh pore distribution of study materials . The the CVI model by a single scale classic set up a series of equations to calculate the local porosity characterize the pore structure changes to achieve the purpose of tracking the CVI process development . However , the model itself there are some problems , the simulation results and both theoretical and experimental deviation . Baiyun , Yue Industrial and Zeng Qingfeng proposed a modified CVI multi-scale model , scale divided by the preform , respectively, in the micro-and macro-scale model , combined with porosity evolution equations to simulate the structural changes of the preform during the reaction , the model has a good solution to the problem of singularity in the classical model . Correction CVI multiscale model for the periodic structure of the (local ) material . This paper presents a model for non-periodic structure of the material in the micro and macro scale modeled after CVI process (that is, the hole has been closed , SiC deposition occurs only in the surface of the fiber bundles stage ) numerical simulation . Reconstruct the microscopic concentration of reaction - diffusion equations in a microscopic model , the use of macro concentration relationship exists by the the microscopic concentration and interface speed of the equation and Level Set equation coupled using LevelSet function to track the growth of micro - fiber bundles interface CVI process and Statistics micro- porosity and hole effective reaction area . At the macro level , in the framework of different values ??multiscale method macro concentration equation and solution of statistics on the entire calculation area overall porosity . In this paper, the algorithm of the complete process description of the whole evolution of the model over time , the same time , the article also gives specific numerical examples and analysis .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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