Failure criterion of thin-walled tubes subjected to proportional and non-proportional loading

The values are predicted of critical deformation for localized fuel can necking under proportional and non-proportional loads. The theoretical models are assessed of critical deformation relations on the deformation pathway, and constitutive equations are formulated and applied to anisotropic material under a non-proportional load. Bifurcation analysis is performed of localized necking based on improved description of the orthotropic material plasticity area under a proportional load. The results obtained are compared with experiments, and the effect is assessed of the constitutive material description on the predicted critical deformation values. (author). 7 figs., 27 refs