Study on Strain Concentration for Cylindrical Tubes Under Axial Compressive Loading

In this paper, elastoplastic post-buckling behavior of cylindrical tubes under axial compression is studied by using finite element method. In our study, the effects of tube geometries and strain hardening characteristics on high strain concentrations in circumferential direction ε_θ which arise at the vertex of outward wrinkles are investigated. It is found that the maximum value of ε_θ depends on the thickness-to-radius ratio t/R and the nondimentional hardening coefficient E_h/E, and independent of the length-to-radius ratio L/R. In addition, in order to evaluate the maximum strain ε_θ,max, the effects of tube geometries and strain hardening characteristics on the deformed shapes of folding wrinkles are also discussed.