Influence of magnetic fields on the mechanical loss of Terfenol-D/PbZr0.52Ti0.48O3/Terfenol-D laminated composites

Effect of Bias Magnetic Field on Magnetoelectric Characteristics in Magnetostrictive/Piezoelectric Laminate Composites

“…Q m is an inverse measure of damping in a material (or system). For the ME composite, represents mechanical energy dissipation [11]. According to the frequency dependency for the ME voltage coefficient, it estimates the mechanical energy dissipation ( ) for ME composite defined as [12] ,…”

“…can be given by [11] , (7) where and are the mechanical damping of PZT and Terfenol-D, respectively. is the loss at the interface of PZT and Terfenol-D layers.…”

“…Nan et al predicted the dependence of ME response on H dc by using the Green's function technique and taking into consideration the nonlinear dependence of the magnetostriction of Terfenol-D on H dc , but the model is not in an explicit form [5,8] ME composites based on a nonlinear magnetostrictive constitutive relation, but it is obviously inconvenient for practical applications due to adopting five fitting parameters to fit the experimental results [7]. Besides that, significant increase in the ME voltage coefficient is observed at resonance due to the strain by a factor called the mechanical quality factor Q m of the composites, but the research on the connection of bias magnetic field and Q m is rare [11].…”

Model of resonance mechanical loss that considers bias field and pre-stress in magnetostricitve/piezoelectric sandwich laminate

“…To obtain the giant magnetoelectric effect, research has concentrated on laminates with ferrite, shapememory alloys, or Terfenol-D as the magnetostrictive component, and PZT or PMN-PT as the piezoelectric phase. Laminates composed of Terfenol-D have been extensively studied because of its large piezomagnetic coefficient and relatively low cost; also, its magnetoelectric voltage coefficient is as high as V cm À1 Oe À1 at a quasi-static frequency, and the magnetoelectric coupling effect of a laminated structure in a resonance state is 1-2 orders of magnitude stronger than in a quasi-static state [6][7][8]. For example, Duan et al [6] found the resonance ME coefficient (a ME ) of Terfenol-D/PVDF/Terfenol-D at a magnetic bias of 600 Oe to be $20 times higher than that in a non-resonance state.…”

“…Mechanical loss in the laminates made of Terfenol-D and PZT is a major factor in the resonance magnetoelectric effect. Even when comparing similar resonance frequencies, differing mechanical losses will cause large changes in the resonance magnetoelectric coefficient; for example, Yao et al [8] found that the measured peak of magnetoelectric coefficients of Terfenol-D/ PZT/Terfenol-D at a resonance frequency of 110 kHz was 1.5 times bigger than that at 97.5 kHz. Using the equivalent circuit method, Dong et al [10][11] established a resonance magnetoelectric coefficient model and found that the resonance magnetoelectric coefficient was proportional to the mechanical quality factor (reciprocal of mechanical loss).…”