Journal
PHYSICS LETTERS A
Volume 381, Issue 12, Pages 1055-1066Publisher
ELSEVIER
DOI: 10.1016/j.physleta.2017.01.044
Keywords
Phononic crystal plate; Band gap; Magnetostrictive material; Magnetic field; Pre-stress
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Funding
- National Natural Science Foundation of China [11072093, 11372120, 11421062]
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Considering the magneto-mechanical coupling of magnetostrictive material, the tunability of in-plane wave propagation in two-dimensional Terfenol-D/epoxy phononic crystal (PC) plate is investigated theoretically by the plane wave expansion method. Two Schemes, i.e. magnetic field is rotated in x-y plane and x-z plane, are studied, respectively. The effects of amplitude and direction of magnetic field, pre-stress and geometric parameters are discussed. For Scheme-I, band gap reaches the maximum at an optimal angle 45 degrees of magnetic field. However, the optimal angle is 0 degrees for Scheme-II, because band gap decreases monotonically until disappears with the increasing angle. For both cases, higher-order band gaps generate and become stronger as magnetic field amplitude increases, while increasing compressive pre-stress has the opposite effect. Meanwhile. filling fraction plays a key role in controlling band gaps. These results provide possibility for intelligent regulation and optimal design of PC plates. (C) 2017 Elsevier B.V. All rights reserved.
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