Nonlinear thermo-mechanical buckling of axially compressive Ceramic-FGM-Metal cylindrical shell reinforced by orthogonal and spiral stiffeners

In this paper, the nonlinear buckling and postbuckling behavior of orthogonal and spiral stiffened Ceramic-FGM-Metal thin circular cylindrical shells under axial compression loads is presented. The material properties of shell and stiffeners are assumed to be continuously varied in the thickness direction respecting to the piecewise functions. The shells are reinforced by rings, stringers and spiral stiffeners attached to inside surface of shells. The thermal effects are also included and the material properties of Ceramic-FGM-Metal are assumed to be temperature-dependent. By using the Donnell shell theory and Galerkin method, the explicit forms of critical buckling load and expression of postbuckling load-deflection curves relation are obtained. The effects of the stiffeners, temperature change, volume fraction index of shells and stiffeners are numerically investigated.