期刊
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
卷 316, 期 -, 页码 568-585出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2016.08.015
关键词
Topology optimization; Lattice material; Isogeometric analysis; Asymptotic homogenization; Multiscale mechanics
This paper presents isogeometric topology optimization (ITO) for periodic lattice materials, where non-uniform rational B-spline (NURBS) basis functions of CAD models are directly used in the finite element analysis to improve computational accuracy and efficiency. Two TO schemes that use asymptotic homogenization (AH) for the calculation of the mechanical properties are proposed for lattice materials with uniform and graded relative density respectively. To accelerate ITO for graded lattice materials, the mechanical properties are expressed as a function of the relative density of the unit cell, a step that avoids their iterative calculations during ITO. Three benchmark examples are presented to validate the proposed scheme with results that show tangible advantages, such as reduced computational time and faster convergence, of ITO over conventional TO. (C) 2016 Elsevier B.V. All rights reserved.
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