Influence of uniaxial pressure on elastic waves propagation in piezoelectric layered structures “Y-cut langasite/fused silica”

The study of influence of external uniaxial mechanical stress on the dispersive characteristics and anisotropy of elastic waves in such piezoelectric structures as "Y-cut La$_3$Ga$_5$SiO$_{14}$/fused silica" has been conducted. The results of computer simulation taking into account the linear and nonlinear material constants of materials have been presented. The comparison of elastic wave velocity changes under the influence of an uniaxial stress while a full set of nonlinear material constants of crystalline layer + geometric nonlinearity, or only geometric nonlinearity of the layer induced by the static deformation of a substrate has been fulfilled.