Influences of defects on the propagation of transverse waves in periodic piezoelectric laminate structure with nanoscaled layers

• Published in: Thin-walled structures 2022-10, Vol.179, p.109567, Article 109567
• Main Authors: Yan, Dongjia, Liu, Rui, Zhou, Jingxuan, Li, Hongbo, Chen, A-Li, Zhang, Chuanzeng
• Format: Article
• Language: English
• Subjects: Defect mode; Nanoscaled piezoelectric laminates; Nonlocal theory; Size-effect; Transmission spectra
• ISSN: 0263-8231; 1879-3223
• DOI: 10.1016/j.tws.2022.109567

By the stiffness matrix method based on the nonlocal elastic continuum theory, the transmission spectra of the transverse elastic waves propagating normally in nanoscaled periodic piezoelectric laminates with defects are investigated in detail in this paper. Defect is introduced by replacing a constituent layer or inserting another layer in a unit-cell. The thicknesses of all sub-layers and defect layer are at the nanoscale. Simultaneously, complex band structures and localization factors are calculated and employed to verify the band structures described by the transmission spectra. The influences of the defect type, the defect material, the volume fraction of the defect layer in the unit-cell, the piezoelectric constants of the defect layer, and the nanoscale size-effect on the transmission spectra are analyzed and discussed in detail. The present study provides a theoretical guide for the design and applications of the nanoscaled acoustic filters or transducers with defects. •Transmission spectra of waves propagating in nanoscaled periodic piezoelectric laminates with defects are investigated based.•Influences of the defect material and structural parameters on the band structures and the defect modes are analyzed.•Desirable defect modes can be obtained by properly adjusting the defect material and structural parameters.