Theoretical Study of The Occurrence Limit of Strain Nonuniformity in Cylinders, based on the Prediction of In-plane Bifurcation

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Hysteretic behavior numerical analysis has been carried out for elastic-plastic thin-walled cylinders subjected to a constant axial compressive force and cyclic torsion. It has been shown that various deformation modes appear, which are different from those under the constant axial contraction, and that those modes cause rapid growth of strain nonuniformity. Also the theory for predicting this phenomenon has been generalized to the alternating plasticity region and the numerical analysis program has been developed. Since this phenomenon is analogous to internal buckling, finite element analysis for it has been performed.