Abstract: By considering mechanical and electrical coupling characteristics of piezoelectric composite materials, the wave localization in disordered periodic layered piezoelectric composite structures is studied. According to the mechanical and electrical continuity conditions, the transfer matrix between two consecutive unit cells is obtained. The expression for calculating the localization factors in disordered periodic structures is presented by means of the variables in mechanical and electrical fields. As an example, numerical results of localization factors are presented. It can be seen from the results that the piezo-effect of the piezoelectric ceramics has significant effects on the characteristics of wave localization in periodic piezoelectric composites. The larger the piezoelectric constant of the piezoelectric ceramics and the degree of disorder of the structure are, the larger the localization factor or the stronger the wave localization is. The conclusions have theoretical significance for optimization design and vibration control in periodic piezoelectric composite structures.

Key words: piezoelectric composite, disordered periodic structure, mechanical-electrical coupling, wave localization, transfer matrix