Vibration analysis of electrorheological sandwich beams with transversely compressible core

The dynamic characteristic of the elect rorheological ( ER) sandwich beams with a compressible core wasstudied. Assuming that the t ransverse displacement s vary with the thickness of the ER layer , a compressional-shearmodel was developed based on a first order shear deformation theory and the energy approach. Then the dynamicequations were solved by the finite element method. The result s show that the t ransverse displacement s of the topelastic layer and the bottom layer are different . The difference is small in the low-f requency range , but obvious inthe high-f requency range. Increasing the intensity of the applied electric field will decrease the difference. The thicker the ER layer , the larger the difference.