Dynamic stability enhancement of laminated composite sandwich plates using smart elastomer layer

Abstract

The dynamic stability of composite sandwich plates with a smart elastomer layer subjected to an axial periodic load is investigated. A finite element model of the composite sandwich plate with Magnetorheological elastomer (MRE) core is developed. A MRE layer, which its mechanical properties change with the applied magnetic field, is used as a damping layer to improve the stability of the structure. Due to the intrinsic characteristics of the MREs, these materials commonly operate in their pre-yield region. In this region, complex shear modulus is used for these materials. The effect of different parameters such as stacking sequences, boundary conditions, geometry of the sandwich plate, thickness and partial activation of the MRE layer on the damping treatment and stability boundaries is investigated. The presented results show that the application of an MRE layer as a core in the composite sandwich plate changes the stability region of the structure. Therefore, the instability boundaries can be manipulated to achieve the desired dynamic response of the structure.

Application of smart electro-rheological dampers in semi-active control of electro-rheological sandwich plates with nanocomposite facesheets rested on orthotropic visco-Pasternak foundation

“…Hamilton's principle is used to derive the governing equations of motion of sandwich plate with ER fluid core and CNTs-reinforced nanocomposite facesheets resting on orthotropic visco-Pasternak foundation with external ER dampers. The principle can be defined in an analytical form where the (19)…”

“…Lopez et al [17] proposed a method for modeling ER dampers using its dynamic characteristics based on the experimental data and then compared the obtained results with the Choi parametric and the Eyring-plastic models. Finally, Hoseinzadeh and Rezaeepazhand [18,19] studied the effects of external ER dampers on dynamic behavior of composite laminated plates. They used the first-order shear deformation theory (FSDT) to model displacement field of laminated plates and the Bingham plastic model for the post yield behavior of the ER material.…”

Static and dynamic performances of sandwich plates with magnetorheological elastomer core: Theoretical and experimental studies

“…Sajad et al 29 investigated the effects of the combination of constant and harmonic external magnetic field conditions on the frequency response of a CNT-reinforced MRE beam. Hoseinzadeh et al 30 developed a finite element model of a composite sandwich plate with an MRE core subjected to axial periodic loads and analyzed the effect of the activated MRE on the minimum dynamic load factor. Using a generalized Maxwell model, Yarali et al 31 proposed a new magnetic-dependent rheological model to predict the dynamic responses of MRE composite plates reinforced by fibers.…”

Supersonic flutter analysis of annular/circular sandwich panels containing magnetorheological fluid

“…It is well known that the stiffness and damping of the structure are two important parameters, which can significantly improve stability of the thin-walled structures in response to an airflow. Since sandwich panels comprise the core layer, which can substantially alter damping and stiffness properties of the structure, they are known to have superior performance in the vibration and flutter suppressions [1–5].…”