Volume 25, Issue 3 (May 1997)

    Analysis of Fatigue Data with Runouts Based on a Model with Nonconstant Standard Deviation and a Fatigue Limit Parameter

    (Received 26 October 1995; accepted 23 October 1996)

    CODEN: JTEOAD

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    Abstract

    The fatigue-limit model studied here contains an unknown fatigue limit parameter. Under this model, specimens tested below this fatigue-limit level of stress will never fail. The model also allows the standard deviation of fatigue life to be a function of stress. Researchers can use this model to describe the standard deviation and stress dependence in fatigue data. To illustrate its application, we use maximum likelihood methods to fit the model to fatigue data on a nickel base superalloy. Modern statistical methods based on likelihood ratio provide confidence intervals for the fatigue limit parameter. We also study the effect that test length has on estimation by analyzing simulated data sets based on this model. Through this simulation study, we gain insight into practical test lengths for future fatigue experiments.


    Author Information:

    Pascual, FG
    Iowa State University, Ames, IA

    Meeker, WQ
    Iowa State University, Ames, Iowa


    Stock #: JTE11341J

    ISSN: 0090-3973

    DOI: 10.1520/JTE11341J

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    Title Analysis of Fatigue Data with Runouts Based on a Model with Nonconstant Standard Deviation and a Fatigue Limit Parameter
    Symposium , 0000-00-00
    Committee E08