The power gain from the piezoelectric harvesters depends on the several
parameters and one of them is to design the substructure as to increase
the mechanical strain occurred in the piezoelectric material. In this
study, the effectiveness of auxetic structures is investigated by
comparing them to non-auxetic nonlinear structures rather than comparing
them to the plain structures unlike the literature. It is shown that the
power gain from auxetic structures is very high compared to plain
structures; however, this increase in power can also be achieved using a
non-auxetic simple rectangular structure in some cases. The increase in
the power gain using the auxetic structures is due to the increase in
the strain in the longitudinal direction, and the effect of the sign
change in the perpendicular direction is not very effective on the
response. In the second part of the study, four new shapes inspired by
Re-entrant structure are presented for increased power response, and
power responses of these structures are evaluated under different cases.
The results show that new structures outperformed the plain structure in
all cases and performed better from the auxetic structure in some cases.
A combination of finite element analysis and experimental study is
implemented in the study.
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