Dynamic behavior of periodic piezoceramic-polymer composite plates

The dynamic behaviors of periodic piezoceramic-polymer composite plates, especially the effect of the finite thickness on the strain distributions and resonant modes, are studied theoretically. It is found that as long as f _L1<f_t1, where f_L1 and f_t1are the thickness and first piezoelectric active stop band-edge mode frequencies, there exists a frequency f₁ near f_L1at which the polymer and ceramic vibrate in phase with equal amplitude in the x₃ direction. The effect of the thickness of a composite plate is to change the bandwidth in which the two vibrate in unison. It is also found that due to the finite thickness effect a series of piezoelectric active modes at frequencies near and above f_t1may be excited.