Journal
IEEE-ASME TRANSACTIONS ON MECHATRONICS
Volume 16, Issue 1, Pages 33-41Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMECH.2010.2089635
Keywords
Dielectric materials; energy conversion; generators; modeling
Categories
Funding
- Agency for Science, Technology and Research (A*STAR), Singapore
- National Science Foundation
- Kavli Institute at Harvard University
- Austrian Science Fund
- Austrian Marshall Plan Foundation
- China Scholarship Council Foundation
- Austrian Science Fund (FWF) [P 22912] Funding Source: researchfish
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Dielectric elastomers are being developed as generators to harvest energy from renewable sources, such as human movements and ocean waves. We model a generator as a system of two degrees of freedom, represented on either the stress-stretch plane or the voltage-charge plane. A point in such a plane represents a state of the generator, a curve represents a path of operation, a contour represents a cycle of operation, and the area enclosed by the contour represents the energy of conversion per cycle. Each mechanism of failure is represented by a curve in the plane. The curves of all the known mechanics of failure enclose the region of allowable states. The area of this region defines the maximum energy of conversion. This study includes the following mechanisms of failure: material rupture, loss of tension, electrical breakdown, and electromechanical instability. It is found that natural rubber outperforms VHB elastomer as a generator at strains less than 15%. Furthermore, by varying material parameters, energy of conversion can be increased above 1.0 J/g.
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