Geometrical Modeling And FEM Analysis Of The Electronic Ceramics

Two aspects of the simulation of polycrystalline materials has been studied in this dissertation: 1. The RCP-LV model has been improved to be a better representation for the geometrical structure of real materials; 2. Another simulation model——the LV-FEM model which is utilized to compute the dielectric constant by the finite element method has also been revised both in its software structure and function.Although the RCP-LV model is superior to other models for its varieties, it still can not be considered as a perfect polycrystal model because the shapes of the Voronoi cells are too regular comparing with real materials. So we employ the disarrangement method to solve this shape problem. We firstly finished the procedure module of the disarrangement method and then embedded it into the original RCP-LV model. The final simulation result shows that the improved RCP-LV model not only inherits the advantages of the original RCP-LV model, moreover, its geometrical characterization becomes more consistent with the real electronic ceramics.The LV-FEM model which is designed for computing the dielectric constant has also been revised in many aspects. Firstly, the procedure structure of the model has been reformed by the object-oriented method. Secondly, some unreasonable demerits of the LV-FEM model have been corrected, which makes the model more efficient. Last, but not the least, the field-analysis procedure module has been added to the LV-FEM model. Thus the new LV-FEM model can not only compute the dielectric constant, but also reveal the relation between the microstructure and dielectric behavior of electronic ceramics.At the end of the dissertation, some helpful proposals are put forward for the advanced research in electronic ceramics simulation.