This study deals with vibration of a sandwich beam with laminated faces and electro-rheological (ER) core employing FEM. ER layer is adhered to the laminated composite beam to control vibration of the beam. In contrast to most of previous studies in which a Kevin viscoelastic model has been used, in this study behavior of ER core is modeled based on Bingham equation. Both face layers are considered symmetric. In order to achieve the transient response of the beam a finite difference approach called Direct Integration Method is used and dynamic response of the beam to an initial excitation is calculated. Effects of different parameters such as beam geometry, electric field and layer sequence on natural frequencies and settling time is investigated. Obtained results show that by increasing the intensity of applied electric field and the thickness of ER core, damping properties of the beam improve and settling time decrease. And also for symmetric faces by increasing the angle of fibers, natural frequencies are decreased.

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