Proc. Instn Civ. Engrs, Part 2, 1981, 71, Mar., 235-261 8420 Lower bound elasto-plastic buckling of cylinders of theelasticbuckling of axiallyloaded of all independent the isotropic cylinderssummarized. is When accounttaken is parameters controlling the behaviour of this simple, physically based, method of analysis, it is shown to provide close lower bounds for the vast range of existing elastic test results, of a number of important previously but unexplained and provide to explanations experimental observations. On the basis of first axial membrane yieldit is shown how this of elasto-plastic reduced stiffness model be may extended to include possibility the collapse...