弱界面固体附层媒质中的类Rayleigh波

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国家自然科学基金资助项目

详细信息

The quasi-Rayleigh waves in a solid layered media with a weak interface

摘要: 当半无限大固体媒质上有一层固体附加层时表面波是频散的。由界面的“准弹簧”模型,本文导出了有各向同性固体附加层时半无限大各向同性均匀媒质中弱界面情况下的类Rayleigh波的特征方程。文中给出了典型复合结构具有刚性联接界面、滑移联接界面和弱界面时类 Rayleigh波的色散曲线,分析了界面刚度系数对类 Rayleigh波传播速度的影响。数值计算的结果表明选择合适的参数可以由低频超声类Rayleigh进行涂层结构界面特性的无损评价。

Abstract: The Rayleigh waves in a solid layered media is dispersive. Using the "spring" model for a weak interface between two solids, the characteristic equation for the Quasi-Rayleigh waves in an isotropic solid layered isotropic media with a weak interface is presented. The numerical results for the typical coating structure with rigid, slip and weak interface are shown in this paper. The influence of the interface stiffness constants on the velocity of the quasi-Rayleigh waves is considered. The numerical results show that the interface characteristics of the coating structure can be nondestructively evaluated by employing the quasi-Rayleigh waves in the low frequency band.