The flexural vibration of laminated composite beams sandwiched by two electro-rheological (ER) fluid layers has been investigated to maximize the possible damping capacity. The equations of motion are derived for flexural vibrations of symmetrical, multilayer laminated beams with double ER fluid layers. The damped natural frequency, damping ratio, and modal damping of the first bending mode are calculated by means of an iterative complex eigensolution method. For the validation of the finite element modeling method using viscoelastic theory, the predicted dynamic properties are compared to the experimental results and they show a good agreement. The impact of varying the stacking sequence of beams on the stiffness and the damping properties is studied. The active and passive damping ratio and modal damping for the first bending of the beam are calculated for various fiber orientations and various electric fields. When an electric field is applied, the active damping is more effective in a flexible laminated beam than in a stiff beam. The laminated beams have the best performance at the electric field of 0.4 kV mm -1 for damping, and 1.0 kV mm -1 for stiffness. A proper choice of fiber orientation angle and the electric field can maximize the structural damping and/or stiffness. The design strategy of a laminated composite under flexural vibrations incorporating an ER fluid is addressed.
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Kang et al. (2001) studied this question.
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