期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 105, 期 -, 页码 217-234出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2017.05.010
关键词
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资金
- Sofja Kovalevskaja Award
- State Key Laboratory of Structural Analysis for Industrial Equipment [GZ1607]
- European Research Council [615132]
- Mechanical Engineering Department at Boston University
We present a mixed finite element formulation for flexoelectric nanostructures that is coupled with topology optimization to maximize their intrinsic material performance with regards to their energy conversion potential. Using Barium Titanate (BTO) as the model flexoelectric material, we demonstrate the significant enhancement in energy conversion that can be obtained using topology optimization. We also demonstrate that non-smooth surfaces can play a key role in the energy conversion enhancements obtained through topology optimization. Finally, we examine the relative benefits of flexoelectricity, and surface piezoelectricity on the energy conversion efficiency of nanobeams. We find that the energy conversion efficiency of flexoelectric nanobeams is comparable to the energy conversion efficiency obtained from nanobeams whose electromechanical coupling occurs through surface piezoelectricity, but are ten times thinner. Overall, our results not only demonstrate the utility and efficiency of flexoelectricity as a nanoscale energy conversion mechanism, but also its relative superiority as compared to piezoelectric or surface piezo-electric effects. (C) 2017 Elsevier Ltd. All rights reserved.
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