Resonance Characteristics of Woven Fiber Composite Flat Panels in Hygrothermal Environment

The present study deals with the parametric resonance characteristics of woven fiber laminated composite plates with uniform rise in temperature and moisture concentration. The effects of various parameters like increase in number of layers, ply-orientations of composite plates at elevated temperatures and moisture concentrations on the principal instability regions are studied using finite element method. The first-order shear deformation theory is used to model the composite plates under hygrothermal environment, considering the effects of transverse shear deformation and rotary inertia. The results on the dynamic stability studies of the woven fiber laminated composite plates with different parameters suggest that the onset of instability occurs earlier and the width of dynamic instability regions increase with rise in temperature and moisture. The instability occurs earlier with increase in temperature and moisture for different parameters.