Topology optimization of dielectric elastomers for wide tunable band gaps

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:143

Article

Bortot, Eliana^1,3  Amir, Oded²  Shmuel, Gal¹ 

[1] Technion Israel Inst Technol, Fac Mech Engn, IL-32000 Haifa, Israel

[2] Technion Israel Inst Technol, Fac Civil Engn, IL-32000 Haifa, Israel

[3] Univ Calif San Diego, Dept Struct Engn, San Diego, CA 92103 USA

关键词: Dielectric elastomer composite;    Tunability;    Phononic crystal;    Topology optimization;    Band gap;    Finite deformation;    Wave propagation;   

DOI  :  10.1016/j.ijsolstr.2018.03.014

来源: Elsevier

【 摘 要 】

Dielectric elastomer composites exhibit band gaps-ranges of frequencies at which elastic waves cannot propagate-that are tunable by electrostatically-controlled deformations. We show how topology optimization of such composites can widen these gaps and improve their tunability. Our case study focuses on anti-plane shear waves in fiber composites, across a designated frequency range. Employing a genetic algorithm approach, we maximize the gap width when the composite is actuated by prescribed electric fields, as well the relative change in the gap width with respect to an unactuated composite. We present optimization results for a composite whose constituents agree with commercial products. We compare these results with the performance of a composite of the same constituents arranged in circular fibers, to demonstrate the improvement achieved by the optimization. We expect that the performance of dielectric elastomer composites can be further improved, by employing a larger design space than the exemplary space in this study. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free