含纖聚合物充模過程的多尺度數(shù)學(xué)模型研究與過程模擬
[Abstract]:Fiber-containing polymer matrix composites have a wide range of applications and development space, but the research of fiber-containing polymer-based composites is not perfect. First of all, most of the research focused on the mechanical properties of the finished parts, and most of the experimental methods are used, and there are few numerical simulation studies on the molding process of polymer matrix composites containing fiber. Secondly, the filling process is the main stage of injection molding, accompanied by quite complex physical processes, that is, solidification, volume shrinkage and possible crystallization process. Although some literatures have established the mathematical model of polymer melt filling process and carried out numerical simulation, but for the filling process of polymer matrix composites containing fiber, the generation of phase transition has been neglected. Thirdly, the properties of polymer materials are closely related to the microstructure of polymer during injection molding. However, most researchers only pay attention to the macroscopic behavior of melt and fiber during injection molding. The microscopic behavior of melt and fiber during injection molding is seldom studied. Up to now, there is no comprehensive and accurate multi-scale mathematical model with phase change filling process. In this paper, from the point of view of mathematical modeling, a multi-scale mathematical model of the filling process of fiber polymer matrix composites with phase transition is established, and the corresponding numerical method is used to solve the model. The solidification phenomena near the wall and the formation of weld lines in the cavity during the molding process of the viscoelastic melt and the fibrillar viscoelastic melt are successfully simulated, and some hydrodynamic and thermodynamic problems during the filling process of the melt are discussed. The motion and orientation of the fiber, the stress change and the conformation information of the micro molecular chain were studied, and the calculated results were in agreement with the experimental results qualitatively. The main work of this paper is as follows: 1. Based on the phase field model, a new Level Set method is established as a method to track the moving interface in the filling process, and the corresponding high precision solution scheme is given. Compared with the traditional Level Set method, this method combines the Level Set equation and the reinitialization equation into one equation, which can greatly reduce the computational cost and track the motion interface more accurately. A modified enthalpy model suitable for both melt and gas in the cavity is proposed to describe the phase transition during the filling process, and a gas-liquid two-phase macroscopic model with phase transition in the filling process of the viscous (elastic) fluid is established. The control equation is discretized and solved by the finite volume method based on the same grid. The validity of the model and the algorithm is verified by the datum problems such as non-isothermal plate shrinkage flow, drop and dam-break. A macroscopic (flow) mesoscopic (fiber) model for the filling of fiber polymer matrix composites with phase transition is established. The model is discretized and solved by using the finite volume method based on the in-situ grid. The filling process of polymer matrix composites containing fiber was successfully simulated. The changes of physical quantities, solidification phenomena and fiber orientation during filling are studied. The results are consistent with the experimental results. A macroscopic (flow)-mesoscopic (fiber)-microcosmic (molecular chain) multi-scale model for the filling process of fiber containing polymer matrix composites with phase transition was established. The physical properties of macroscopic flow are described by Navier-Stokes equation, the mesoscopic fiber motion is described by Newton's motion theorem, and the information of micro molecular chain is obtained by Brown configuration field method. The model was discretized and solved by using the finite volume method based on the same grid. The filling process of polymer matrix composites containing fiber was successfully simulated. The information of macroscopic physical properties, mesoscopic fiber orientation and micro molecular chain conformation were obtained.
【學(xué)位授予單位】:太原科技大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2015
【分類號(hào)】:TQ317;TB33
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