Abstract
In this paper, the dynamic characteristics of sandwich plates with external rigid layers and an upper layer with magnetorheological properties (MR) are investigated. An analysis of the effect of the magnetic field on frequency and loss factor is presented. Vibration can be controlled by a magnetic-rheological viscoelastomer (MRVE), when used in sandwich plates. During vibration, MRVE exhibits an inhomogeneous complex module, which is controlled by an applied magnetic field and depends on the oscillation frequency. Using the dynamic equilibrium conditions, physical and kinematic relationships, and the partial differential equations for the conjugate transverse and longitudinal oscillations of a sandwich plate, are derived. This paper presents a new method for stress analysis that provides accurate stress distributions for multilayer plates subject to cylindrical bending. It uses an adaptive method that does not make strict assumptions about the plate model. Based on the depicted theoretical model, the deformations of each layer of the plate are accounted for, including both transverse shear deformations and transverse normal deformations where the thickness is concerned, and nonlinear displacement changes. The magnetorheological (MR) identification of an inner layer is carried out using refined plate theory and sandwich bending tests. Using combined methods, the possibility of determining the MRVE parameters robustly, is examined.
Highlights
Magneto-rheological visco-elastomers (MRVE) are used in laminated plates to control vibration
It is necessary to explain the dynamic characteristics of such elements, in particular the amount of energy dissipation, which is affected by the applied magnetic field
In the MRVE, such dynamics are available as controlled stiffness and the frequency-dependent damping of a magneto-rheological fluid combined with a viscoelastic polymer
Summary
Magneto-rheological visco-elastomers (MRVE) are used in laminated plates to control vibration. It is necessary to explain the dynamic characteristics of such elements, in particular the amount of energy dissipation (damping), which is affected by the applied magnetic field. The magnetic elastomer is a smart, composite material composed of magnetically polarizable particles and nonmagnetic polymers, such as rubber, silicone oil, and iron particles. With external magnetic fields applied in milliseconds, its dynamic characteristics, including rigidity and damping [1,2,3], can be changed reversibly. MRVE usually consists of silicone rubber and carbonate iron particles. This composite continuum medium contains proportionally distributed iron particles. In the MRVE, such dynamics are available as controlled stiffness and the frequency-dependent damping of a magneto-rheological fluid combined with a viscoelastic polymer.
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