The work is focused on the modeling of creep-fatigue behavior in austenitic stainless steels in the presence of complex loading histories and multiaxial states of stress. Two interaction models, namely “Continuous Damage Model” and “Damage Rate Approach,” have been applied to predict experimental results of time-variable loading and multiaxial tests. Related application difficulties and prediction accuracy are discussed. Life predictions were obtained from computer programs written to perform numerical calculations. Material parameters were derived from over 1500 uniaxial tests conducted on AISI 304 and 316 austenitic stainless steel specimens.

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