Deformation phenomena in the convergence of metallic cylindrical shells. Buckling

The structural mechanisms of buckling and the deformation behavior of copper and steel cylindrical shells (pipes) during convergence under the action of an explosion are studied. The dependence of deformation behavior on the transverse dimensions of the shell and properties of the loaded material is described. It is established that the stability of radial convergence depends on absolute dimensions of the shell rather than relative dimensions, with the convergence of large-diameter shells occurring more stably. It is demonstrated that the convergence stability is violated due to the formation of a characteristic pattern of localized deformation in the sample, consisting of homogeneous, orderly arranged structural elements whose dimension depends little on the material properties and experimental conditions. A criterion for stable radial convergence that relates the characteristic dimensions of the structural element of localized deformation and the shell radius is proposed.