Axially strain controlled low cycle fatigue tests of carbon steel JIS STS410 at the strain amplitude of 0.3% and 0.6% were carried out under changing and constant temperature conditions in oxygenated water.The fatigue life under in-phase pattern condition in which temperature was synchronizing with the strain cycling was longer than that under out-of-phase pattern condition in which temperature was changed in anti-phase to the strain cycling at the strainamplitude of 0.3%, whereas the fatigue life under in-phase pattern condition was equal to that under out-of-phase pattern condition at the strain amplitude of 0.6%.The modified rate approach method (Kishida et al., 1997) predicted an accurate fatigue life except that it gave the shorter fatigue life prediction under in-phase pattern condition at the strain rate of 0.3%, indicating the method gives an adequate andconservative fatigue life under changing temperature conditions.
展开▼
