Auxetic piezoelectric energy harvesters for increased electric power output
Li, Qiang; Kuang, Y; Zhu, M
Date: 20 January 2017
Journal
AIP Advances
Publisher
American Institute of Physics
Publisher DOI
Abstract
This letter presents a piezoelectric bimorph with auxetic (negative Poisson’s ratio) behaviors for
increased power output in vibration energy harvesting. The piezoelectric bimorph comprises a 2D auxetic
substrate sandwiched between two piezoelectric layers. The auxetic substrate is capable of introducing auxetic
behaviors and thus ...
This letter presents a piezoelectric bimorph with auxetic (negative Poisson’s ratio) behaviors for
increased power output in vibration energy harvesting. The piezoelectric bimorph comprises a 2D auxetic
substrate sandwiched between two piezoelectric layers. The auxetic substrate is capable of introducing auxetic
behaviors and thus increasing the transverse stress in the piezoelectric layers when the bimorph is subjected to a
longitudinal stretching load. As a result, both 31- and 32-modes are simultaneously exploited to generate electric
power, leading to an increased power output. The increasing power output principle was theoretically analyzed
and verified by finite element (FE) modelling. The FE modelling results showed that the auxetic substrate can
increase the transverse stress of a bimorph by 16.7 times. The average power generated by the auxetic bimorph is
2.76 times of that generated by a conventional bimorph.
Engineering
Faculty of Environment, Science and Economy
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