Nonlinear Thermo-Mechanical Buckling of Torsion-Loaded Cylindrical Shells with Eccentric Stiffeners Made from CNT-Reinforced Composite

In this study, the nonlinear elastic buckling behavior of torsion-loaded cylindrical shell made from CNT-reinforced composite stiffened by CNT-reinforced stiffener system with uniform temperature is presented. The material properties of the CNT-reinforced composite are considered to be varied in the thickness direction according to a uniform and linear distribution in terms of the CNT volume fraction. The stiffeners are assumed to be the ring or stringer stiffener system with the CNT distribution pertinently designed for the material continuity of shell and stiffeners, and modeled with the aid of the development of the classical homogenization technique for stiffeners. The basic equation system is constituted by Donnell thin shell theory with the nonlinearities of deflection and solved by using Galerkin procedure and the expressions for torsional buckling load, postbuckling strength of the cylindrical shell with ring or stringer stiffener system are obtained. Finally, the influences of geometrical parameters, volume fraction distribution of CNT of the shell, and stiffeners on the torsional buckling load and postbuckling strength are discussed. The results of this paper are validated with the available results for the private cases.