Thermal Effects on Parametric Instability of Delaminated Woven Fabric Composite Curved Panels

The present study highlights the parametric instability characteristics of delaminated woven fabric composite curved panels under in-plane harmonic loadings exposed to the thermal environment. The equation of motion of the delaminated curved panel is reduced to a system of Mathieu–Hill equations with periodic coefficients. The development of the region of instability arises from Floquet’s theory and the solution is obtained using Bolotin’s approach by the finite element method (FEM). An eight-noded isoparametric finite element is developed considering the effects of delamination and thermal exposure of the composite panel for predicting the dynamic instability regions (DIRs). The first_order shear deformation theory (FSDT) is used for all the numerical computations. The results predicted from the present finite element analysis are validated with those available in the literature. The effects of static load factor, curvature, delamination, temperature and boundary conditions on the DIRs of curved composite panels are investigated. Noteworthy effects of these parameters on the parametric instability of composite panels are witnessed and discussed.