Predicting Fatigue Life Under Spectrum Loading in 2024-T3 Aluminum Using a Measured Initial Flaw Size Distribution

    Volume 1, Issue 2 (February 2004)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 18 February 2004

    Page Count: 12


    DeBartolo, EA
    Assistant Professor, Rochester Institute of Technology, Rochester, NY

    Hillberry, BM
    Professor, School of Mechanical Engineering, Purdue University, West Lafayette, IN

    (Received 9 September 2002; accepted 11 July 2003)

    Abstract

    Measured cracked particle distributions were used in conjunction with a closure-based life prediction package (FASTRAN 3.8 [1]) to predict fatigue life distributions under a spectrum load (FALSTAFF — Fighter Aircraft Loading STAndard For Fatigue [2]) in 2024-T3 aluminum. A single crack model was assumed and no threshold stress intensity factor was used. Simulations were done at maximum stress levels of 175, 205, and 275 MPa. The resulting fatigue life distributions were compared at different levels of probability of failure. At all levels, predicted fatigue lives were within a factor of two or better of experimental fatigue lives. This indicates both that the single-flaw model can be a reasonable approximation for life prediction and that it is not necessary to truncate initial flaw size distributions at some threshold level.


    Paper ID: JAI11571

    DOI: 10.1520/JAI11571

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    Author
    Title Predicting Fatigue Life Under Spectrum Loading in 2024-T3 Aluminum Using a Measured Initial Flaw Size Distribution
    Symposium Probabilistic Aspects of Life Prediction, 2002-11-06
    Committee E08