Parametric instability analysis of sandwich plates with composite skins and LPRE based viscoelastic core

Abstract

In the present analysis, the parametric instability regions of a three-layered sandwich plate with thin composite skins and leptadenia pyrotechnica rheological elastomer (LPRE) core under axial periodic compressive load is studied for five different boundary conditions. The governing equation of motion is derived using finite element method (FEM) which is in the form of a parametrically excited system. The instability regions of the sandwich plate are found using modified Hsu method. The shear storage modulus and loss modulus of the newly developed LPRE core is determined experimentally and used in this analysis. The dynamic properties of the LPRE based sandwich plates are observed to be better than those of the room temperature vulcanised elastomer core based sandwich plates. The critical dynamic loads and the corresponding frequencies are found which will find various applications in structural design.