Parametric Resonance Characteristics of Laminated Composite Twisted Cantilever Panels

Abstract

The twisted cantilever panels have significant applications in wide chord turbine blades, compressor blades, fan blades and particularly in gas turbines. Structural elements subjected to in-plane periodic forces may lead to parametric resonance, due to certain combinations of the applied in-plane load parameters and the natural frequency of transverse vibrations. The instability may occur below the critical load of the structure under compressive loads over wide ranges of excitation frequencies. Composite materials are increasingly used as load bearing structural components in aerospace and naval structures, automobiles, pressure vessels, turbine blades and many other engineering applications because of their high specific strength, specific stiffness and tailorability. Thus, the parametric resonance characteristics of laminated composite twisted cantilever panels are of great technical importance for understanding the dynamic behaviour of structures under in-plane periodic loads. This aspect of static and dynamic stability behaviour of laminated composite pretwisted cantilever panels is studied in the present investigation.