(Received 26 August 1994; accepted 13 February 1995)
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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.
Center for Quality Engineering and Failure Inspection and Northwestern University, Evanston, IL
Northwestern University, Evanston, IL
Stock #: JTE10432J