Accession Number : ADA295795

Title :   Fatigue Reliability Method with In-Service Inspections.

Descriptive Note : Final rept.,

Corporate Author : NORTHWESTERN UNIV EVANSTON IL

Personal Author(s) : Fleming, M. ; Harkness, H. ; Moran, B. ; Belytschko, T.

PDF Url : ADA295795

Report Date : MAY 1995

Pagination or Media Count : 28

Abstract : The first order reliability method (FORM) has traditionally been applied to probabilistic fatigue analyses for single inspection intervals. Accounting for inspections then requires several sequential FORM analyses and that the random distribution of crack lengths be recharacterized following each inspection. The augmented FORM presented here allows the reliability analyses to span several inspection periods without explicit characterization of the crack length distribution subsequent to each inspection. The method thereby preserves the attractive feature of FORM in that relatively few realizations in the random variable space need to be considered. Examples are given which show that the present methodology gives estimates which are in good agreement with the Monte Carlo simulations and is efficient even for complex components. (KAR) P. 3

Descriptors :   *COMMERCIAL AIRCRAFT, *NONDESTRUCTIVE TESTING, *CRACK PROPAGATION, *INSPECTION, *FATIGUE TESTS(MECHANICS), SIMULATION, DISTRIBUTION, CRACKS, PROBABILITY, MONTE CARLO METHOD, RELIABILITY, SCHEDULING, LENGTH, FATIGUE, INTERVALS.

Subject Categories : Commercial and General Aviation

Distribution Statement : APPROVED FOR PUBLIC RELEASE