Nonlinear flexural vibrations of layered panels with initial imperfections

In the presented paper the nonlinear response of doubly curved layered panels subjected to time-varying lateral loads is studied. The considered panels are composed of three thick perfectly bonded isotropic layers, which are symmetrically arranged with respect to the middle surface. The structural model utilized to analyze the panels is based on a first-order layerwise theory, which includes transverse shear flexibility, initial geometric imperfections, and Berger-type geometric nonlinearities. The boundaries of panels with polygonal planform are modeled as simply (hard hinged) supported edges with the displacements normal to the edge face fully restrained.