NONLINEAR STABILITY PROBLEM OF AN ELASTIC-PLASTIC SANDWICH CYLINDRICAL SHELL UNDER COMBINED LOAD

摘要

The paper presents stability analysis and postbuckling equilibrium paths determination for a free-supported sandwich cylindrical shell loaded by longitudinal forces, lateral pressure, and shear. The basic assumptions in the considered problem comprise geometrical and physical nonlinearities, basing on Prandtl-Reuss incremental plastic flow theory. It is also assumed that the shell faces are of different thicknesses and the material properties of the faces are different. The material is compressible and it has the feature of stress hardening. The active processes of loading in the shell material are considered, and the principle of virtual work is applied to derive the stability equations.