Joint Aircraft Loading/Structure Response Statistics of Time to Service Crack Initiation.
Technical rept. Jan-Jun 74,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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A reliability analysis for predicting the statistical distribution of time to fatigue crack initiation for aircraft structures in service is presented. The present analysis uses the statistical data of the specimen fatigue tests, the full-scale structure tests, and the statistical dispersion of aircraft service loads. The statistical distribution of the fatigue performance of the full-scale structure under laboratory loading spectrum is assumed to be Weibull. The service loads for gust turbulences are modeled as Poisson processes for transport-type aircraft while the maneuver loads are modeled as compound Poisson processes for fighter and training aircrafts.
- Attack and Fighter Aircraft
- Training Aircraft
- Metallurgy and Metallography