Open Access

ARTICLE

Multiscale Isogeometric Topology Optimization with Unified Structural Skeleton

by Chen Yu, Qifu Wang, Chao Mei, Zhaohui Xia

1 National Enterprise Information Software Engineering Research Center, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, China.

∗ Corresponding Author: Qifu Wang. Email: .

(This article belongs to the Special Issue: Recent Developments of Isogeometric Analysis and its Applications in Structural Optimization)

Computer Modeling in Engineering & Sciences 2020, 122(3), 779-803. https://doi.org/10.32604/cmes.2020.09363

Received 06 December 2019; Accepted 12 January 2020; Issue published 01 March 2020

Abstract

This paper proposes a multiscale isogeometric topology optimization (ITO) method where the configuration and layout of microstructures are optimized simultaneously. At micro scale, a shape deformation method is presented to transform a prototype microstructure (PM) for obtaining a series of graded microstructures (GMs), where microstructural skeleton based on the level set framework is applied to retain more topology features and improve the connectability. For the macro scale calculation, the effective mechanical properties can be estimated by means of the numerical homogenization method. By adopting identical non-uniform rational basis splines (NURBS) as basis functions for both parameterized level set model and isogeometric calculation model, the isogeometric analysis (IGA) is integrated into the level set method, which contributes to improving the accuracy and efficiency. Numerical examples demonstrate that, the proposed method is effective in improving the performance and manufacturability.

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Citations