Parametric assessment of torsional springback in members of work-hardening materials

Abstract

The paper deals with the torsional springback problem of bars of strain-hardening materials with arbitrary cross-sections. Using the deformation theory of plasticity, a numerical scheme based on the finite difference approximation has been proposed. The growth of the elastic-plastic boundary and the resulting stresses while loading, and the torsional springback and the residual stresses after unloading, are calculated. The results are verified experimentally with mild steel bars having a square cross-section. The experimental results are found to agree well with the theoretical predictions obtained numerically. © 1992.