Design consideration on creep-fatigue interaction of 316FR steel for actual service loading

摘要

A series of creep-fatigue tests has been made with 316FR austenitic stainless steel in 0.1 #um#Pa vacuum and in air under loading conditions of sequential changes from creep-fatigue loading to fatigue loading and vice versa in order to examine the accumulation behavior of creep,fatigue and creep-fatigue damages with respect to a strain cycle.This material showed a linear accumulaton of damages with respect to loading cycles.It was found that a factor of 1.25 for life margin is sufficient to take into account the estimation error of the creep-fatigue life under complex loading history.