Abstract
The strain rate and temperature distribution in a thin-walled tubular specimen subjected to torsion within the warm-forming temperature range has been analysed. New constitutive relations have been applied, in which the yield stress depends not only on the current values of strain rate and temperature but also on the deformation history due to the recovery and possibly recrystallization. The results of numerical calculations indicate that, if the specimen length exceeds a critical value, the straining process becomes unstable and strain localization in the form of a shear band occurs. If the specimen length is sufficiently small the strain rate and temperature distribution tends to be stabilized. Also the influence of initial temperature and strain rate has been analysed.
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