Abstract
The kinematic theory of strain-hardening is used to evaluate the post-yield behavior of tubular specimens subjected to axial force combined with internal pressure or torque. Prediction of yield-surface motion during strain-hardening is simplified through the use of piecewise linear yield criteria. The predicted behavior is compared with the results of experiments on tubes of Zamak-3 zinc alloy. After an initial loading beyond initial yield, the tubes were reloaded along a second stress path to subsequent yield. The observed state of stress at subsequent yield agreed rather well with the kinematic-hardening theory predictions.
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