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Influence of the transverse inhomogeneity on the nonlinear post-buckling path of compressed FG cylindrical panels

Lykhachova O., Kołakowski Z.

Engineering Transactions

2017

Vol. 65, iss. 4

563--577

In this paper, nonlinear stability of axially compressed cylindrical panels simply supported according to two types of boundary conditions (with possible or limited circumferential displacements of unloaded sides) is presented. Panels made of functionally graded materials (FGMs) of two constituents (metallic and ceramic phases) are treated as multi-layered composite structures with transverse inhomogeneity. Volume fractions of ceramics and metal distribution throughout the layer thickness are described by a simple power law. The influence of the transverse inhomogeneity of FGM panels on unsymmetrical stable post-buckling paths is shown. Special attention is paid to effect of the imperfection sign on post-buckling paths of investigated FGM panels. Some validations of the finite element analysis are discussed for isotropic panels compressed according to two (force and kinematic) loading schemes.

Numerical Simulation of Axially Compressed Cylindrical Shells with Circular Cutouts

Lykhachova O.

Mechanics and Mechanical Engineering

2016

Vol. 20, nr 3

309--320

The present paper deals with FEM modelling of Tennyson’s famous experiment: the buckling problem of axially compressed elastic cylindrical shells with small single circular cutouts. It is completed using ANSYS software package in geometrically linear and nonlinear formulations for three different loading schemes. Two of the loading schemes provide an upper and lower bounds for buckling loads. The third loading scheme corresponds to the experiment and gives an excellent agreement of numerical results with the experimental data. The influence of shell thickness on buckling load is studied in addition to common non–dimensional geometrical shell parameter. Decrease of a shell thickness about two times leads to decrease of buckling load parameter about 7 % in the studied range of cutouts. The efficiency of ANSYS software is proved for the buckling design of shells with highly non–homogeneous stress strain state.