Boundary Element Analysis of 3D Anisotropic Materials and Its Applications

• Main Authors: Chia-wei Lin, 林家瑋
• Other Authors: Yui-Chuin Shiah
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/86905764258726538289

碩士 === 逢甲大學 === 航太與系統工程所 === 97 === Many engineering applications often have components consisting of different materials with distinct properties in physical or chemical phases to achieve their ultimate strength and performance. Such applications are commonly seen in, for example, electronic packages, sandwich composites…etc. The most popular numerical tools for engineering analysis include the finite difference method (FDM), finite element method (FEM), and the boundary element method (BEM). The FDM and FEM must conform to the limitation that the length to width aspect ratios of domain meshes must be in the same order to yield reliable results. For this reason it shall require tremendous meshes to model very thin layers and therefore increase the burden of computation. The present work is to develop an automesh code serving as preprocess of the BEM, which is featured by boundary mesh only. Therefore, no matter how thin the thickness of the layer is, the boundary modeling will not add the amount of mesh and is ideal for analyzing engineering problems, especially involving thin layers. However, when applying the BEM to analyze engineering problems, although the modeling itself is more efficient, the process of manual meshing will still take much effort and is time-consuming. For this reason, this thesis is to develop an automeshing code that enables the user to quickly build necessary input data for pertinent three-dimensional BEM analyses. The end of the thesis provide 6 numerical examples to show the efficiency of the developed code.