Parametric instability of delaminated composite plates subjected to periodic in-plane loading

Abstract

This paper deals with the study of the parametric instability characteristics of delaminated composite plates subjected to periodic in-plane load. A first order shear deformation theory based on finite element method is developed for studying the instability region of mid-plane delaminated composite plate. A detailed parametric investigation is carried out to study the influence of the delamination area, number of layers, degree of orthotropy, aspect ratio and static in-plane load on the dynamic stability characteristics of delaminated cross-ply plates. The results of vibration and buckling of delaminated composite plates are compared with previous numerical studies in the literature and the authors' experimental investigations. The boundaries of instability regions are obtained by using Bolotin's method and are represented in the non-dimensional load amplitude-excitation frequency plane. It is observed that the natural frequencies and the critical buckling load of the plates decrease with an increase in delamination size. The increase in delamination size also causes dynamic instability regions to be shifted to lower excitation frequencies.

Dynamic instability analysis of rotating delaminated tapered composite plates subjected to periodic in-plane loading

“…Fig. 7 Comparison of the non-dimensional exciting frequencies of the uniform composite plate with 6.25% delamination derived using the present FEM with those available in the literature Mohanty et al [24] 6 Parametric study on instability analysis of delaminated tapered composite plates…”

“…The simulation . 6 Comparison of the non-dimensional exciting frequencies of the uniform composite plate with 0 % delamination derived using the present FEM with those available in the literature Mohanty et al [24] is performed with the material and the geometrical properties considered in Mohanty et al [24] [24]. The non-dimensional excitation frequencies of composite plate under uniaxial loading with 0 and 6.25% of width through mid-plane delamination in the planar area located at the center of the plates are evaluated and presented in Figs.…”

“…(23) after substituting only first order of trigonometric series presented in Eq. (24) in order to evaluate the principal instability regions of rotating tapered composite plates:…”

“…The two boundaries of the instability regions were determined using the method proposed by Bolotin. Mohanty et al [24] investigated the parametric instability characteristics of mid-plane delaminated composite plates subjected to periodic in-plane load. A detailed parametric investigation is carried out to study the influence of the delamination area, number of layers, degree of orthotropy, aspect ratio and static in-plane load on the dynamic stability characteristics of delaminated cross-ply plates.…”

Stability Analysis of Variable Stiffness Composite Laminated Plates with Delamination Using Spline-FSM

“…They extract the strain as well as stress distribution through the thickness direction. Mohanty et al (2015) analyzed the dynamic instability of delaminated plates under in-plane harmonic loading. The FST finite element method was utilized.…”