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The problem of phase velocities and attenuations of plane body waves and its reflection from a stress-free surface has been investigated in the micropolar porous materials. The amplitude and energy ratios of reflected waves are obtained analytically. The effect of inertial coefficients in the propagation of plane body waves is computed numerically for a particular model.

The problem of plane waves in micropolar thermoelastic materials with voids has been investigated. Using the linear theory of micropolar thermoelastic materials with voids developed by Passarella [27], we come to know that there exist six waves, which are three coupled dilatational waves, two coupled shear waves and micropolar dilatational wave, in the materials. The phase velocities and their attenuation coefficients of the three coupled and micropolar dilatational and two coupled shear waves are obtained numerically and analytically.2010 Mathematics Subject Classification: 780A17, 74A05, 74J05.

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