Stability Analysis of Circumferentially Stiffened Laminated Cylindrical Shells Under Combined Axial and External Pressure
The application of composite cylindrical shell is greatly increased in aerospace and marine structures. The present paper investigates the stability analysis of ring-stiffened cylinders. Incorporating pre-buckling deformation, buckling load is calculated through geometrically non-linear analysis. The cinematic relations of shell, based on Sanders non-linear theory by including first order shear deformation (FOSD) are manipulated. The appropriate traditional Fourier series functions are selected to express the corresponding displacements and rotations of cylindrical shell and ring stiffeners. The shell is subjected to both axial and external pressure. The study is based on Ritz method and the load-deflection and load-interaction forces curves are obtained by mixed Newton-Raphson iteration and arc-length method.