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    Estimation Procedure for Determination of Fatigue Crack Propagation in Metal Alloys

    Published: Jan 2000

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    Estimation of closure-corrected fatigue crack propagation (FCP) data in monolithic metal alloys was reported recently by the author, using a simple computational method. The quantity Eb, where E = the modulus of elasticity, and b, the dislocation Burgers vector, is used to define a stress intensity factor, corresponding to an FCP rate of b/cyc. The remainder of the FCP curve at higher FCP rates (where da/dN > b) is found to follow a relation of the form: da/dN = (ΔK/E)3(1/√b). Good agreement is found between computed FCP data and recently reported experimental test results for various aluminum, titanium, and steel alloys. Such computations allow for a rapid and inexpensive way to estimate the FCP response of metals under both long and short crack growth conditions.


    fatigue crack propagation, crack closure, fatigue calculations, K, c, max, test methods

    Author Information:

    Hertzberg, RW
    New Jersey Zinc professor of Materials Science and Engineering, Lehigh University, Bethlehem, PA

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP13408S

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