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    Effect of Periodic Overloads on Threshold Fatigue Crack Growth in Al-Alloys

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    Experiments were performed on 10 mm thick C(T) specimens cut from Al-alloys to assess fatigue crack growth behavior under periodic overloads by comparison to constant amplitude loading. The tests were performed at a sufficiently high stress ratio to avoid crack closure, whose absence was confirmed from Load-COD response. ΔKth values were determined under these loadings in air, salt water, and vacuum. Even though closure was absent, ΔKth shows a systematic dependence on overload plastic zone ratio. Similar results were obtained in both air and salt water. In vacuum however, near threshold crack growth is accelerated by comparison to no-overload conditions, while higher growth rates see a reversal in this trend. These results appear to support the possibility that residual stress moderates cracktip surface chemistry in near-threshold fatigue, an effect that ceases in vacuum.


    crack growth mechanisms, thresholds, residual stress effect, crack closure, periodic overloads, environmental action

    Author Information:

    Sunder, R
    BiSS Research, Bangalore,

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP11517S