Elastic Wave Propagation in an Isotropic-Micropolar Interface

• Main Authors: Tsang, Chi-Yu, 臧其宇
• Other Authors: Yang, Shiuh-Kuang
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/85382065728763056671

碩士 === 國立中山大學 === 機械工程研究所 === 84 === The differences between the theory of micropolar elasticity and that of the classical elasticity are the introduction of microrotation and couple stress. It is shown that there are two couple waves in infinite micropolar elatic solid. In this study, the author computes the elastic wave propagation in an istropic-micropolar interface. The power densities of the transmitted and reflected wave are computed for incident P-, SV-, and SH-wave, respectively. Numerical values of the power density are then plotted graphically as a function of the incident angle. To further illustrate the micropolar effect, the elastic wave fields for an isotropic- isotropic boundary are also computed. Numerical results indicate that P-, SV-, and SH-wave are coupled together in the wave fields of the istropic- micropolar interface. It should be noted that in the istropic-isotropic boundary only P- and SV-wave are coupled together. In addition, it needs four independent material constants to describe the wave fields when a P- or SV-wave is incident at the istropic-micropolar interface, however, it needs five independent material constants to describe the wave fields when a SH-wave is incident at the interface.