Study on Crack Growth Behavior in Impact Fatigue : Part III, Fatigue Crack Growth Behaviors of 2017-T3 Aluminum Alloy

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Impact fatigue crack growth behaviors were investigated by using 2017-T3 aluminum alloy, one of the representative f.c.c. metals for mechanical structure, as an experimental material under the stress ratios R=0 and -1. Results are discussed in comparison with those obtained under non-impact fatigue done under the same stress ratios. It is made clear, on log da/dN-log K_<max> diagram, that da/dN in impact fatigue is higher than that in non-impact fatigue under both stress ratio conditions. Furthermore, such a discrepancy in da/dN due to the difference in the stress condition does not disappear in the evaluation done based on the effective stress intensity factor range ΔK_<eff>. And, peculiarities of impact fatigue crack growth behavior obtained in this study well resemble those for low carbon steel demonstrated previously by the authors. It is concluded that the effect of the compressive load in impact fatigue loading of R=-1 on da/dN is smaller than that in non-impact fatigue.
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