摘要
简要描述了模拟两固体间界面特性的弹簧模型 .该模型最早是根据静力学方法提出的 ,后来用固体间界面薄层的声波反射方法加以改进 .从界面弹簧模型可以方便地得到界面处近似边界条件 ,其中包含界面“弹簧”振子的劲度常数和质量 .文章还给出了两相同固体中界面声反射系数的表达式 ,介绍了测量界面劲度常数的超声反射谱方法 .最后讨论了有关声波与界面相互作用研究领域中最近的一些研究进展 .
A spring model for simulating the interface between two solids is presented. The model was proposed initially on the basis of elastic deformation of an interface under externally applied forces, then later modified by asymptotically expanding the transfer matrix for an interfacial thin layer from which acoustic wave reflection is involved. The general boundary conditions at an interface are obtained, which depend on the stiffness constants and masses of the interface springs. Explicit expressions for the acoustic reflection coefficients from the interfaces are given and ultrasonic experiments for measuring the interface stiffness constants are described. Finally, some discussion is given of current research on interactions between sound waves and interfaces.
出处
《物理》
CAS
北大核心
2002年第12期768-772,共5页
Physics
基金
国家自然科学基金 (批准号 :191740 3 7)资助项目
