Abstract
Fatigue crack growth behaviors were investigated under a simple impact stress pattern by using center-notched 0.1%C aluminum killed carbon steel plate specimens, and results obtained were discussed in comparison with those obtained under non impact fatigue. At first, the fact that the crack growth rate in impact fatigue was higher than that in non impact fatigue and that there was a stress range dependence of impact fatigue crack growth rate demonstrated in the previous study done under somewhat complex impact stress pattern confirmed also in this study. Furthermore, the stress range dependence as mentioned above for impact fatigue was explained reasonably from the viewpoint of crack closure behavior, and crack tip plastic zone characteristics under impact fatigue loading were discussed tentatively based on the variation trend of effective stress range, U, or crack opening stress intensity factor, Kop, during crack growth process.
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