PLASTIC AND CREEP DEFORMATIONS OF STAINLESS STEEL SUS 304 UNDER COMBINED STRESS STATES AT ROOM TEMPERATURE.

To investigate the plasticity-creep interaction effects, the combined stress tests for plastic behavior subsequent to creep pre-strain and creep behavior subsequent to pre-strain were performed at room temperature using thin-walled tubular specimens of SUS 304 stainless steel. The stress-strain relations were obtained in these experiments and the plasticity-creep interaction effects were discussed on the basis of the experimental results. An attempt to predict subsequent behaviors to plastic and creep pre-strain was made using an equi-plastic strain surface and an imaginary hardening value of creep strain.