Analysis of Damaged Laminated Composite Plate Under Dynamic and Aeroelastic Environment

Abstract

The effect of microscopic damages such as matrix micro-crack, fiber-matrix debonding and fiber breakage on subsonic flutter of rectangular composite plate is investigated. Flutter analysis is carried out in frequency as well as time domain and results are compared. Damage is modelled using an anisotropic damage formulation. It is observed that presence of microscopic damages in composite plates deteriorates the flutter characteristics. No generic conclusion on pattern of reduction in flutter characteristics of composite plates can be drawn, moreover it depends on the location of damage and layup configuration of the laminate. By proper arrangement of lamina with small microscopic damage, within the laminate, flutter characteristics can be optimized.