A mechanical-magneto-thermal model for the tunability of band gaps of epoxy/Terfenol-D phononic crystals

作者：Zhang, Shunzu; Shi, Yang; Gao, Yuanwen^*

来源：Journal of Applied Physics, 2015, 118(3): 034101.

DOI：10.1063/1.4926483

• ELASTIC-WAVE
• COMPOSITES
• TEMPERATURE
• PROPAGATION

A way based on the temperature effect is investigated to adjust the longitudinal wave band gaps of one-dimensional epoxy/Terfenol-D phononic crystals. For both the cases (with and without consideration of demagnetization effect), the dependences of component materials' effective parameters on temperature are obtained by applying a nonlinear mechanical-magneto-thermal coupling constitutive model and fitting the experimental data, respectively. Further, the influence of temperature on the band structure of wave propagation in phononic crystals consisting of epoxy and Terfenol-D is discussed in detail. Meanwhile, the effects of magnetic field, pre-stress, and filling fraction are studied. Numerical results show that temperature has a significant influence on the band structure of wave propagation in phononic crystals: As temperature rises from -40 degrees C to 40 degrees C, the widths of the first, second, and fourth band gaps increase, while that of the third band gap decreases. In addition, the demagnetization effect should not be ignored under a low magnetic field.

• 出版日期2015-7-21
• 单位兰州大学