期刊
COMPUTER-AIDED DESIGN
卷 40, 期 3, 页码 293-310出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cad.2007.11.003
关键词
FIB-SEM; 3D microstructure simulation; parametric surface; NURBS; gap-overlap removal
This paper develops a robust CAD-based methodology for simulating 3D microstructures of polycrystalline metals using crystallographic input data on sections created by a focused ion beam (FIB)-scanning electron microscopy (SEM) system. The method is able to construct consistent polycrystalline microstructures with control on the resolution necessary for meaningful computational analysis in microstructure-property estimation. The microstructure simulation methodology is based on a hierarchical geometrical representation Using primitives used in CAD modeling. It involves steps of data cleanup, interface point identification, polynomial and NURBS function-based parametric surface segments construction, generalized cell decomposition, geometric defeaturing, and gap and overlap removal. The implementation of the entire procedure described above is performed with the aid of user-programming facilities of a commercial CAD package Unigraphics NX3. The microstructure simulation algorithm is validated using various error criteria and measures for an extracted microstructure of a nickel superalloy. (c) 2007 Elsevier Ltd. All rights reserved.
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