非理想界面正交各向异性层/压电半空间结构中Love波传播特性

Propagation behavior of love waves in an orthotropic layer/piezoelectric half-space with an imperfect interface

研究了正交各向异性层与压电半空间非理想连接时Love波的传播特性。其中,界面条件由剪切滞后模型表征,正交各向异性层表面机械自由。首先,对压电材料和正交各向异性材料的波动方程进行求解,然后利用界面条件和边界条件推导显函形式的频散方程,最后进行数值计算,分析界面性态、压电材料性能和正交各向异性程度对频散特性的影响。分析结果表明:Love波的传播速度随着界面约束强度的降低而减小;当不理想程度较高时,正交各向异性程度和压电材料性能对Love波的传播速度影响不大。

The propagation behavior of love waves was investigated in a layered half-space structure with an imperfect interface. The structure consisted of an orthotropic elastic layer and a piezoelectric half-space. The imperfect level of the interface was described with a shear-lag model. The surface of the orthotropic layer was assumed to be mechanically free. The wave equations of the piezoelectric material and the orthotropic material were solved firstly, and then, the dispersion equation was derived in an explicit function form with boundary conditions and interface conditions. The numerical examples were provided to show the combined effects of imperfect interface, orthotropic level and material properties of piezoelectric layer on the dispersion characteristics. The results showed that the velocity of love waves decreases with wakening of interface constraint intensity; the orthotropic level and the piezoelectric constants have little effect on the velocity of love waves when the interface is highly imperfect.