Microcracks: The Hazard Function and Reliability Inspection

    Volume 23, Issue 4 (July 1995)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 4


    Lawson, L
    Center for Quality Engineering and Failure Inspection and Northwestern University, Evanston, IL

    Chen, EY
    Northwestern University, Evanston, IL

    (Received 26 August 1994; accepted 13 February 1995)

    Abstract

    Reliability inspections of structures for fatigue cracks are traditionally conducted at equispaced intervals because, it is assumed, the average slope of the hazard function following an inspection does not change from one inspection to the next. This study examines the common case where fatigue cracks nucleate continually over time. In such cases it is found that the slope of the hazard function after inspection may tend to increase from one inspection to the next, suggesting that inspection intervals should decrease with increasing service life. A formalism is introduced that allows calculation of the hazard function from microcrack data.


    Paper ID: JTE10432J

    DOI: 10.1520/JTE10432J

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    Author
    Title Microcracks: The Hazard Function and Reliability Inspection
    Symposium , 0000-00-00
    Committee C28