Harvesting energy with load-driven dielectric elastomer annular membranes deforming out-of-plane

Bortot, Eliana and Gei, Massimiliano (2015) Harvesting energy with load-driven dielectric elastomer annular membranes deforming out-of-plane. Extreme Mechanics Letters, 5. pp. 62-73. ISSN 2352-4316

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Abstract

The capabilities of a dielectric elastomer generator formed by a hyper-electro-elastic annular membrane deforming non-homogeneously out-of-plane are investigated. The mechanical-to-electric energy conversion is determined for a four-stroke cycle, driven by an external oscillating force, that may extend within an admissible state region delimited by the typical four failure modes of dielectric elastomers: electric breakdown, electromechanical instability, maximum stretch limit, and loss of the tensile state. Performance in terms of harvested energy per unit mass and efficiency of the generator is determined in relation to: (i) initial prestretch of the membrane, (ii) external to internal radius ratio, and (iii) intensity of maximum external load. The analysis concludes with a comparison between the behaviours of two different soft materials (i.e. an acrylic elastomer and a type of natural rubber), and an estimation of the most effective generator geometry among those analysed by the authors here and in past studies.

Item Type:	Article
Uncontrolled Keywords:	Dielectric elastomer generator, Nonlinear electro-elasticity, Renewable energy
Subjects:	H600 Electronic and Electrical Engineering
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Paul Burns
Date Deposited:	05 Apr 2019 13:21
Last Modified:	10 Oct 2019 20:34
URI:	http://nrl.northumbria.ac.uk/id/eprint/38803

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