Vibration and Stability Response of Laminated Composite Panels with Elliptical Cutout Under Hygrothermal Conditions

The purpose of this paper is to discuss the vibration and buckling responses of laminated composite panels with a central elliptical hole in a hygrothermal (HTL) environment. This work is an extension of previous work on Hygrothermomechanical vibration and buckling analysis of composite laminates with elliptical cutout (EC) under localized edge loads. By considering the effect of transverse shear deformation and rotational inertia, a nine-noded heterosis plate element had been used to discretize the plate. Geometric non-linearity is being used to evaluate the HTL response to free vibration. The dynamic method was utilized to address the buckling issues since the stress distribution in the plate element is non-uniform. A finite element code has been developed to evaluate the outcomes of environmental effects with various parameters such as ply angle orientation, EC orientation, various EC dimensions and sizes, thickness, and boundary conditions to examine the vibration and buckling responses under hygrothermomechanical conditions.