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(a) Schematic diagram of the proposed shear mode three-phase magnetostrictive/piezoelectric/brass heterostructure. (b) The coordinate system shows the crystalline directions of the PMN-PT single crystal. (c) and (d) illustrate the motion of the PMN-PT single crystal under shear extensional and longitudinal extensional stresses, respectively. The arrows P and T i (i = 3 and 5) denote the polarization and stress directions. The Terfenol-D layer in the heterostructure has two functions: the end part (bonded to PMN-PT) generates a longitudinal extensional stress T 3, and the center part (unbounded to PMN-PT) produces a shear extensional stress T 5.
ME coefficient α E as a function of dc magnetic bias H dc for a shear-mode Terfenol-D/PMN-PT laminate composite. The points denote the values of α E for the L-L mode, L-T mode, and push-pull mode Terfenol-D/PMN-PT laminate composites (see Refs. 7–9).
Time-domain waveforms of (a) applied ac magnetic field H ac and ME output voltage V ME for (b) the shear mode Terfenol-D/PMN-PT laminates and (c) a one-sided longitudinal-extensional laminate. The inset shows the photos of the shear-mode and one-side longitudinal-mode laminate composites.
Constituent material parameters of PMN-PT for transverse-extensional, longitudinal-extensional, and shear modes.
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