Reflection and transmission of longitudinal displacement wave through micropolar elastic plate in micropolar fluid

Based on micropolar fluid theory and micropolar solid elasticity theory, reflection and transmission characteristics of three kinds of micropolar elastic waves involving longitudinal displacement wave and two coupled waves, are studied when incident longitudinal displacement plane wave propagates through micropolar elastic solid plate in micropolar fluid. Theoretical and numerical analytical results reveal that in general the amplitude ratios of various reflected and transmitted waves are functions of angle of incidence, frequency of the incident wave and of the material properties of the medium through which they travel. At normal incidence, the reflection and transmission of only longitudinal waves take place and no coupled transverse wave is found to reflect or transmit. At grazing incidence, no reflection or transmission phenomena take place and the same wave propagates along the interface. The change rules of the reflection waves and refraction waves amplitudes varied with incident angle are also discussed.