Free vibration responses of 3D braided rotating cylindrical shells based on third-order shear deformation

Abstract

3D braided composite has achieved attractiveness over the laminated composite due it some unique properties such as higher impact resistance, fatigue strength, stiffness in the thickness direction, anti-delamination capability, etc. In this study, the equivalent material properties of the composites are computed using bridging models base on a volume averaging method (VAM). Four steps 1 × 1 braided technique are introduced to manufacture the 3D braided rotating cylindrical shells panels. A third-order shear deformation (TSDT) with twelve degrees of freedom per node is used in the present eight nodded isoparametric 3D-finite element formulation (FEM). This theory has more capability compared to the other shell theories to predict the accurate results of the 3D braided shell. The generalized dynamic equilibrium equation of the present models is derived from Lagrange’s equation of motion. For moderate rotational speeds, the Coriolis effect is neglected. The correctness of the present finite element code is investigated by verifying with the existing results. The modals result of the rotating cylindrical shells (CYS) is computed at a different braided angle, braided volume fraction, aspect ratio, thickness ratio, curvature ratio, twist angle, blade setting angle, pre-cone angle, and rotational speeds, etc.