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- W652591551 abstract "In this study, stress-life (S-N) fatigue curves are predicted for high-strength aluminum alloy 7055 for open-hole specimens at two stress ratios, R = 0.1 and 0.5, and smooth specimens at R = 0.1 using the small-crack growth model of Brockenbrough et al. [1,2] and closure-free FCG curves obtained from long-crack tests by the following methods: (1) high R testing at R = 0.7; (2) constant K m a x testing at K m a x of 11 and 24.7 MPa√m; (3) a ΔK e f f curve obtained at the appropriate stress ratio (R = 0.1 or 0.5) by the ASTM method; and (4) a ΔK e f f curve obtained at the appropriate stress ratio by the adjusted compliance ratio (ACR) method. The predictions were compared to experimental S-N fatigue data. The objective of the study was to determine which method of obtaining closure-free FCG curves from long-crack tests provided the best estimates of fatigue life for the three combinations of specimen type and stress ratio in conjunction with the small-crack growth model employed. The ΔK e f f curves obtained by the ACR method yielded the closest and most consistent fatigue predictions for all three conditions. This was attributed to this method being able to account for K m a x sensitivity of fatigue crack growth rates in aluminum alloys that could not be accounted for by the other methods." @default.
- W652591551 created "2016-06-24" @default.
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- W652591551 date "2008-04-18" @default.
- W652591551 modified "2023-09-24" @default.
- W652591551 title "Prediction of S-N Fatigue Curves Using Various Long-Crack-Derived Δ" @default.
- W652591551 doi "https://doi.org/10.1520/stp13416s" @default.
- W652591551 hasPublicationYear "2008" @default.
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