Surface Wave Propagation on Microporous Layer Embedded between Two Elastic Media

表面波在微孔性板材及雙層彈性夾板間的傳遞特性

夏紹毅(Shao-Yi Hsia) ； 蘇智群(Chih-Chun Su) ； 鄭錦文(Jyin-Wen Cheng)

《中國機械工程學刊》 34卷1期 (2013/02) Pp. 45-54

摘要

在地震、地質探勘及複合材料的研究中，因為在不同夾層中傳遞的表面波會攜帶著許多有用的訊息，故一直在各應用領域中扮演著重要的角色。本研究嘗試建立有關三明治夾層結構的表面波傳遞模型，其中最上及最下層為均質且彈性的材料，中間夾層則為微孔性材料。相關的波傳模式將在本研究中被有系統的推導出，在微孔性材料部份，它除了擁有一般傳統彈性理論所談及的位移縱波外，尚存在有耦合剪力微旋轉波，如此將使得波傳行為變得更複雜。由研究結果可以看出表面縱波或耦合的表面橫波將受到工作頻率及材料性質的不同而有所影響，他們將先後發生在入射角為50及76時，該研究結果的發現將有助於我們去進一步了解夾層介面間所可能產生結合上長期使用所產生瑕疵問題。

並列摘要

Surface waves play an important role in the study of earth quakes, seismology, geophysics and composite materials. The propagation of surface elastic waves carries information about the mounted situation between the interfaces of the layer media. In this paper, the propagation of surface waves along the interfaces of the homogeneous isotropic microporous elastic plate sandwiched between two semi-infinite media is investigated. The secular equations are derived for investigating the propagation of different wave modes in the layered media. The results show that the generation of surface longitudinal displacement or coupled transverse waves is governed by the working frequency and character of the mounted composite materials In addition; the first critical incident angle 50° and the second critical incident angle 76° are found, owing to grazing P1 and S3-surface waves. The phenomena obtained in this paper will benefit checking the mounted problem between the multi-layer composite materials.

並列關鍵字

Multi-layer materials ； Surface wave ； Microporous elastic plate