含耦合弱界面的压电/压磁声子晶体带隙研究

Study on Band Gap of Piezoelectric/Piezomagnetic Phononic Crystal With Imperfect Interface of Magneto-electro-mechanical Coupling

将力-电-磁耦合的弱界面引入到压电/压磁声子晶体中,利用传递矩阵法和Bloch定理,研究了界面损伤和损伤耦合对第一带隙特性的影响。结果表明,第一带隙起始频率、终止频率随弱界面内的力学损伤增大而下降,独立发生的磁、电损伤不会影响第一带隙特性;当磁、电损伤与力学损伤耦合时,第一带隙起始频率、终止频率随耦合系数增大而下降,磁电损伤耦合系数不会对第一带隙产生影响。

The imperfect interface of magneto-electro-mechanical coupling is introduced into piezoelectric/piezo-magnetic phononic crystal.The influences of interfacial imperfections and imperfections coupling on the first band gap characteristics are studied by the transfer matrix method and Bloch theorem.The results show that the initial and terminal frequencies of first band gap are decreased with the increase of mechanical imperfection in the imperfect interface.The independent magnetic and electrical imperfection does not affect the first band gap characteristic.When the magnetic and electrical imperfections are coupled with the mechanical imperfection,the initial and terminal frequencies of first band gap are decreased with the increase of coupling coefficient.The coupling coefficient of magneto-electric imperfection will not affect the first band gap.