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    Fatigue Crack Growth Rates as a Function of Temperature

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    The equation dadN=C[(KlGKlmin)+ΔKT][(KlmaxKIG)ΔKT]2 had been proposed by the author to predict fatigue crack growth rates. By adopting this functional relation and setting KIG = 0.5 KImax (KIGKIopen under constant-amplitude cyclic loading), there are the two parameters, C and ΔKI, left to be determined from experimental data.

    The parameters C and ΔKT for several structural alloys as a function of temperature between room temperature and 811 K had been analyzed. It was found that the “fatigue tolerance range” ΔKT decreased linearly with increasing temperature. Initially, the parameter C increases nearly linearly with increasing temperature and then increases steeply at higher temperatures. In the present work, this temperature dependence is shown to be found between 4 and 911 K by analyzing low-temperature as well as additional high-temperature data for Inconel 718 and Inconel X-750. By assuming the observed qualitative temperature dependence of C and ΔKT as being correct, available fatigue crack growth rates for Type 304 stainless steel obtained at temperatures ranging from 4 to 922 K were analyzed with respect to C and ΔKT.


    fatigue, crack growth rates, Inconel 718, Inconel X-750, Type 304 stainless steel, temperature effect, material parameters

    Author Information:

    Marci, G
    DFVLR—German Aerospace Establishment, Institut für Werkstoff-Forschung, Cologne,

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP28795S