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Materials 2016, 9(3), 186;

Topological Design of Cellular Phononic Band Gap Crystals

Centre for Innovative Structures and Materials, School of Engineering, RMIT University, GPO Box 2476, Melbourne 3001, Australia
Key Laboratory of Advanced Technology for Vehicle Body Design & Manufacture, Hunan University, Changsha 410082, China
Author to whom correspondence should be addressed.
Academic Editor: Juergen Stampfl
Received: 28 January 2016 / Revised: 2 March 2016 / Accepted: 3 March 2016 / Published: 10 March 2016
(This article belongs to the Special Issue Cellular Materials: Design and Optimisation)
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This paper systematically investigated the topological design of cellular phononic crystals with a maximized gap size between two adjacent bands. Considering that the obtained structures may sustain a certain amount of static loadings, it is desirable to ensure the optimized designs to have a relatively high stiffness. To tackle this issue, we conducted a multiple objective optimization to maximize band gap size and bulk or shear modulus simultaneously with a prescribed volume fraction of solid material so that the resulting structures can be lightweight, as well. In particular, we first conducted the finite element analysis of the phononic band gap crystals and then adapted a very efficient optimization procedure to resolve this problem based on bi-directional evolutionary structure optimization (BESO) algorithm in conjunction with the homogenization method. A number of optimization results for maximizing band gaps with bulk and shear modulus constraints are presented for out-of-plane and in-plane modes. Numerical results showed that the optimized structures are similar to those obtained for composite case, except that additional slim connections are added in the cellular case to support the propagation of shear wave modes and meanwhile to satisfy the prescribed bulk or shear modulus constraints. View Full-Text
Keywords: cellular phononic crystals; band gap; homogenization; BESO; bulk modulus; shear modulus cellular phononic crystals; band gap; homogenization; BESO; bulk modulus; shear modulus

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Li, Y.F.; Huang, X.; Zhou, S. Topological Design of Cellular Phononic Band Gap Crystals. Materials 2016, 9, 186.

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