Analytical, numerical and experimental study of the plastic buckling behavior of thick cylindrical tubes under axial compression

摘要: Abstract This paper deals with the elastoplastic buckling problem of thick cylindrical shells under axial compression. The main idea is to propose an analytical solution procedure which gives rise reliable results in a straightforward and low time-consuming manner, for dimensioning purposes. Thick are thus considered as they known be less imperfection-sensitive than thin ones. First, experimental compression tests performed thanks specific set-up, designed so prevent again, much possible, from imperfections due boundary conditions. Then, numerical finite element computations carried out, it shown that choice free edge conditions (for pre-critical deformations supposed homogeneous) model leads same critical load obtained during tests. Next, solved analytically. classical plastic load, usually derived considering homogeneous state, likely agree predictions this particular case conditions, contrary cases simply-supported or clamped edges actually displaying heterogeneous state. In return, substantial thickness tubes experimentally makes necessary improve well-known appears very bad agreement numerical/experimental values. On one hand, issue kinematics discussed and, on other geometric non-linearities taken into account (pre-critical strains no longer infinitesimal). Finally, new shows good both results.